https://www.noscommunes.ca/js/nowinthehouse.min.js

383            // Support three module loading scenarios
384            if (typeof define === 'function' && define['amd']) {
385                // [1] AMD anonymous module
386                define(['exports', 'require'], factory);
387            } else if (typeof exports === 'object' && typeof module === 'object') {
388                // [2] CommonJS/Node.js
389                factory(module['exports'] || exports);  // module.exports is for Node.js
390            } else {
391                // [3] No module loader (plain <script> tag) - put directly in global namespace
392                factory(window['ko'] = {});
393            }
394        }(function (koExports, amdRequire) {
395            // Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
396            // In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
397            var ko = typeof koExports !== 'undefined' ? koExports : {};
398            // Google Closure Compiler helpers (used only to make the minified file smaller)
399            ko.exportSymbol = function (koPath, object) {
400                var tokens = koPath.split(".");
401
402                // In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
403                // At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
404                var target = ko;
405
406                for (var i = 0; i < tokens.length - 1; i++)
407                    target = target[tokens[i]];
408                target[tokens[tokens.length - 1]] = object;
409            };
410            ko.exportProperty = function (owner, publicName, object) {
411                owner[publicName] = object;
412            };
413            ko.version = "3.5.1";
414
415            ko.exportSymbol('version', ko.version);
416            // For any options that may affect various areas of Knockout and aren't directly associated with data binding.
417            ko.options = {
418                'deferUpdates': false,
419                'useOnlyNativeEvents': false,
420                'foreachHidesDestroyed': false
421            };
422
423            //ko.exportSymbol('options', ko.options);   // 'options' isn't minified
424            ko.utils = (function () {
425                var hasOwnProperty = Object.prototype.hasOwnProperty;
426
427                function objectForEach(obj, action) {
428                    for (var prop in obj) {
429                        if (hasOwnProperty.call(obj, prop)) {
430                            action(prop, obj[prop]);
431                        }
432                    }
433                }
434
435                function extend(target, source) {
436                    if (source) {
437                        for (var prop in source) {
438                            if (hasOwnProperty.call(source, prop)) {
439                                target[prop] = source[prop];
440                            }
441                        }
442                    }
443                    return target;
444                }
445
446                function setPrototypeOf(obj, proto) {
447                    obj.__proto__ = proto;
448                    return obj;
449                }
450
451                var canSetPrototype = ({ __proto__: [] } instanceof Array);
452                var canUseSymbols = !DEBUG && typeof Symbol === 'function';
453
454                // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
455                var knownEvents = {}, knownEventTypesByEventName = {};
456                var keyEventTypeName = (navigator && /Firefox\/2/i.test(navigator.userAgent)) ? 'KeyboardEvent' : 'UIEvents';
457                knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
458                knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
459                objectForEach(knownEvents, function (eventType, knownEventsForType) {
460                    if (knownEventsForType.length) {
461                        for (var i = 0, j = knownEventsForType.length; i < j; i++)
462                            knownEventTypesByEventName[knownEventsForType[i]] = eventType;
463                    }
464                });
465                var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406
466
467                // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
468                // Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.
469                // Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.
470                // If there is a future need to detect specific versions of IE10+, we will amend this.
471                var ieVersion = document && (function () {
472                    var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');
473
474                    // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
475                    while (
476                        div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
477                        iElems[0]
478                    ) { }
479                    return version > 4 ? version : undefined;
480                }());
481                var isIe6 = ieVersion === 6,
482                    isIe7 = ieVersion === 7;
483
484                function isClickOnCheckableElement(element, eventType) {
485                    if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
486                    if (eventType.toLowerCase() != "click") return false;
487                    var inputType = element.type;
488                    return (inputType == "checkbox") || (inputType == "radio");
489                }
490
491                // For details on the pattern for changing node classes
492                // see: https://github.com/knockout/knockout/issues/1597
493                var cssClassNameRegex = /\S+/g;
494
495                var jQueryEventAttachName;
496
497                function toggleDomNodeCssClass(node, classNames, shouldHaveClass) {
498                    var addOrRemoveFn;
499                    if (classNames) {
500                        if (typeof node.classList === 'object') {
501                            addOrRemoveFn = node.classList[shouldHaveClass ? 'add' : 'remove'];
502                            ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function (className) {
503                                addOrRemoveFn.call(node.classList, className);
504                            });
505                        } else if (typeof node.className['baseVal'] === 'string') {
506                            // SVG tag .classNames is an SVGAnimatedString instance
507                            toggleObjectClassPropertyString(node.className, 'baseVal', classNames, shouldHaveClass);
508                        } else {
509                            // node.className ought to be a string.
510                            toggleObjectClassPropertyString(node, 'className', classNames, shouldHaveClass);
511                        }
512                    }
513                }
514
515                function toggleObjectClassPropertyString(obj, prop, classNames, shouldHaveClass) {
516                    // obj/prop is either a node/'className' or a SVGAnimatedString/'baseVal'.
517                    var currentClassNames = obj[prop].match(cssClassNameRegex) || [];
518                    ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function (className) {
519                        ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);
520                    });
521                    obj[prop] = currentClassNames.join(" ");
522                }
523
524                return {
525                    fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
526
527                    arrayForEach: function (array, action, actionOwner) {
528                        for (var i = 0, j = array.length; i < j; i++) {
529                            action.call(actionOwner, array[i], i, array);
530                        }
531                    },
532
533                    arrayIndexOf: typeof Array.prototype.indexOf == "function"
534                        ? function (array, item) {
535                            return Array.prototype.indexOf.call(array, item);
536                        }
537                        : function (array, item) {
538                            for (var i = 0, j = array.length; i < j; i++) {
539                                if (array[i] === item)
540                                    return i;
541                            }
542                            return -1;
543                        },
544
545                    arrayFirst: function (array, predicate, predicateOwner) {
546                        for (var i = 0, j = array.length; i < j; i++) {
547                            if (predicate.call(predicateOwner, array[i], i, array))
548                                return array[i];
549                        }
550                        return undefined;
551                    },
552
553                    arrayRemoveItem: function (array, itemToRemove) {
554                        var index = ko.utils.arrayIndexOf(array, itemToRemove);
555                        if (index > 0) {
556                            array.splice(index, 1);
557                        }
558                        else if (index === 0) {
559                            array.shift();
560                        }
561                    },
562
563                    arrayGetDistinctValues: function (array) {
564                        var result = [];
565                        if (array) {
566                            ko.utils.arrayForEach(array, function (item) {
567                                if (ko.utils.arrayIndexOf(result, item) < 0)
568                                    result.push(item);
569                            });
570                        }
571                        return result;
572                    },
573
574                    arrayMap: function (array, mapping, mappingOwner) {
575                        var result = [];
576                        if (array) {
577                            for (var i = 0, j = array.length; i < j; i++)
578                                result.push(mapping.call(mappingOwner, array[i], i));
579                        }
580                        return result;
581                    },
582
583                    arrayFilter: function (array, predicate, predicateOwner) {
584                        var result = [];
585                        if (array) {
586                            for (var i = 0, j = array.length; i < j; i++)
587                                if (predicate.call(predicateOwner, array[i], i))
588                                    result.push(array[i]);
589                        }
590                        return result;
591                    },
592
593                    arrayPushAll: function (array, valuesToPush) {
594                        if (valuesToPush instanceof Array)
595                            array.push.apply(array, valuesToPush);
596                        else
597                            for (var i = 0, j = valuesToPush.length; i < j; i++)
598                                array.push(valuesToPush[i]);
599                        return array;
600                    },
601
602                    addOrRemoveItem: function (array, value, included) {
603                        var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.peekObservable(array), value);
604                        if (existingEntryIndex < 0) {
605                            if (included)
606                                array.push(value);
607                        } else {
608                            if (!included)
609                                array.splice(existingEntryIndex, 1);
610                        }
611                    },
612
613                    canSetPrototype: canSetPrototype,
614
615                    extend: extend,
616
617                    setPrototypeOf: setPrototypeOf,
618
619                    setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend,
620
621                    objectForEach: objectForEach,
622
623                    objectMap: function (source, mapping, mappingOwner) {
624                        if (!source)
625                            return source;
626                        var target = {};
627                        for (var prop in source) {
628                            if (hasOwnProperty.call(source, prop)) {
629                                target[prop] = mapping.call(mappingOwner, source[prop], prop, source);
630                            }
631                        }
632                        return target;
633                    },
634
635                    emptyDomNode: function (domNode) {
636                        while (domNode.firstChild) {
637                            ko.removeNode(domNode.firstChild);
638                        }
639                    },
640
641                    moveCleanedNodesToContainerElement: function (nodes) {
642                        // Ensure it's a real array, as we're about to reparent the nodes and
643                        // we don't want the underlying collection to change while we're doing that.
644                        var nodesArray = ko.utils.makeArray(nodes);
645                        var templateDocument = (nodesArray[0] && nodesArray[0].ownerDocument) || document;
646
647                        var container = templateDocument.createElement('div');
648                        for (var i = 0, j = nodesArray.length; i < j; i++) {
649                            container.appendChild(ko.cleanNode(nodesArray[i]));
650                        }
651                        return container;
652                    },
653
654                    cloneNodes: function (nodesArray, shouldCleanNodes) {
655                        for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {
656                            var clonedNode = nodesArray[i].cloneNode(true);
657                            newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);
658                        }
659                        return newNodesArray;
660                    },
661
662                    setDomNodeChildren: function (domNode, childNodes) {
663                        ko.utils.emptyDomNode(domNode);
664                        if (childNodes) {
665                            for (var i = 0, j = childNodes.length; i < j; i++)
666                                domNode.appendChild(childNodes[i]);
667                        }
668                    },
669
670                    replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
671                        var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
672                        if (nodesToReplaceArray.length > 0) {
673                            var insertionPoint = nodesToReplaceArray[0];
674                            var parent = insertionPoint.parentNode;
675                            for (var i = 0, j = newNodesArray.length; i < j; i++)
676                                parent.insertBefore(newNodesArray[i], insertionPoint);
677                            for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
678                                ko.removeNode(nodesToReplaceArray[i]);
679                            }
680                        }
681                    },
682
683                    fixUpContinuousNodeArray: function (continuousNodeArray, parentNode) {
684                        // Before acting on a set of nodes that were previously outputted by a template function, we have to reconcile
685                        // them against what is in the DOM right now. It may be that some of the nodes have already been removed, or that
686                        // new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been
687                        // leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.
688                        // So, this function translates the old "map" output array into its best guess of the set of current DOM nodes.
689                        //
690                        // Rules:
691                        //   [A] Any leading nodes that have been removed should be ignored
692                        //       These most likely correspond to memoization nodes that were already removed during binding
693                        //       See https://github.com/knockout/knockout/pull/440
694                        //   [B] Any trailing nodes that have been remove should be ignored
695                        //       This prevents the code here from adding unrelated nodes to the array while processing rule [C]
696                        //       See https://github.com/knockout/knockout/pull/1903
697                        //   [C] We want to output a continuous series of nodes. So, ignore any nodes that have already been removed,
698                        //       and include any nodes that have been inserted among the previous collection
699
700                        if (continuousNodeArray.length) {
701                            // The parent node can be a virtual element; so get the real parent node
702                            parentNode = (parentNode.nodeType === 8 && parentNode.parentNode) || parentNode;
703
704                            // Rule [A]
705                            while (continuousNodeArray.length && continuousNodeArray[0].parentNode !== parentNode)
706                                continuousNodeArray.splice(0, 1);
707
708                            // Rule [B]
709                            while (continuousNodeArray.length > 1 && continuousNodeArray[continuousNodeArray.length - 1].parentNode !== parentNode)
710                                continuousNodeArray.length--;
711
712                            // Rule [C]
713                            if (continuousNodeArray.length > 1) {
714                                var current = continuousNodeArray[0], last = continuousNodeArray[continuousNodeArray.length - 1];
715                                // Replace with the actual new continuous node set
716                                continuousNodeArray.length = 0;
717                                while (current !== last) {
718                                    continuousNodeArray.push(current);
719                                    current = current.nextSibling;
720                                }
721                                continuousNodeArray.push(last);
722                            }
723                        }
724                        return continuousNodeArray;
725                    },
726
727                    setOptionNodeSelectionState: function (optionNode, isSelected) {
728                        // IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
729                        if (ieVersion < 7)
730                            optionNode.setAttribute("selected", isSelected);
731                        else
732                            optionNode.selected = isSelected;
733                    },
734
735                    stringTrim: function (string) {
736                        return string === null || string === undefined ? '' :
737                            string.trim ?
738                                string.trim() :
739                                string.toString().replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
740                    },
741
742                    stringStartsWith: function (string, startsWith) {
743                        string = string || "";
744                        if (startsWith.length > string.length)
745                            return false;
746                        return string.substring(0, startsWith.length) === startsWith;
747                    },
748
749                    domNodeIsContainedBy: function (node, containedByNode) {
750                        if (node === containedByNode)
751                            return true;
752                        if (node.nodeType === 11)
753                            return false; // Fixes issue #1162 - can't use node.contains for document fragments on IE8
754                        if (containedByNode.contains)
755                            return containedByNode.contains(node.nodeType !== 1 ? node.parentNode : node);
756                        if (containedByNode.compareDocumentPosition)
757                            return (containedByNode.compareDocumentPosition(node) & 16) == 16;
758                        while (node && node != containedByNode) {
759                            node = node.parentNode;
760                        }
761                        return !!node;
762                    },
763
764                    domNodeIsAttachedToDocument: function (node) {
765                        return ko.utils.domNodeIsContainedBy(node, node.ownerDocument.documentElement);
766                    },
767
768                    anyDomNodeIsAttachedToDocument: function (nodes) {
769                        return !!ko.utils.arrayFirst(nodes, ko.utils.domNodeIsAttachedToDocument);
770                    },
771
772                    tagNameLower: function (element) {
773                        // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
774                        // Possible future optimization: If we know it's an element from an XHTML document (not HTML),
775                        // we don't need to do the .toLowerCase() as it will always be lower case anyway.
776                        return element && element.tagName && element.tagName.toLowerCase();
777                    },
778
779                    catchFunctionErrors: function (delegate) {
780                        return ko['onError'] ? function () {
781                            try {
782                                return delegate.apply(this, arguments);
783                            } catch (e) {
784                                ko['onError'] && ko['onError'](e);
785                                throw e;
786                            }
787                        } : delegate;
788                    },
789
790                    setTimeout: function (handler, timeout) {
791                        return setTimeout(ko.utils.catchFunctionErrors(handler), timeout);
792                    },
793
794                    deferError: function (error) {
795                        setTimeout(function () {
796                            ko['onError'] && ko['onError'](error);
797                            throw error;
798                        }, 0);
799                    },
800
801                    registerEventHandler: function (element, eventType, handler) {
802                        var wrappedHandler = ko.utils.catchFunctionErrors(handler);
803
804                        var mustUseAttachEvent = eventsThatMustBeRegisteredUsingAttachEvent[eventType];
805                        if (!ko.options['useOnlyNativeEvents'] && !mustUseAttachEvent && jQueryInstance) {
806                            if (!jQueryEventAttachName) {
807                                jQueryEventAttachName = (typeof jQueryInstance(element)['on'] == 'function') ? 'on' : 'bind';
808                            }
809                            jQueryInstance(element)[jQueryEventAttachName](eventType, wrappedHandler);
810                        } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
811                            element.addEventListener(eventType, wrappedHandler, false);
812                        else if (typeof element.attachEvent != "undefined") {
813                            var attachEventHandler = function (event) { wrappedHandler.call(element, event); },
814                                attachEventName = "on" + eventType;
815                            element.attachEvent(attachEventName, attachEventHandler);
816
817                            // IE does not dispose attachEvent handlers automatically (unlike with addEventListener)
818                            // so to avoid leaks, we have to remove them manually. See bug #856
819                            ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
820                                element.detachEvent(attachEventName, attachEventHandler);
821                            });
822                        } else
823                            throw new Error("Browser doesn't support addEventListener or attachEvent");
824                    },
825
826                    triggerEvent: function (element, eventType) {
827                        if (!(element && element.nodeType))
828                            throw new Error("element must be a DOM node when calling triggerEvent");
829
830                        // For click events on checkboxes and radio buttons, jQuery toggles the element checked state *after* the
831                        // event handler runs instead of *before*. (This was fixed in 1.9 for checkboxes but not for radio buttons.)
832                        // IE doesn't change the checked state when you trigger the click event using "fireEvent".
833                        // In both cases, we'll use the click method instead.
834                        var useClickWorkaround = isClickOnCheckableElement(element, eventType);
835
836                        if (!ko.options['useOnlyNativeEvents'] && jQueryInstance && !useClickWorkaround) {
837                            jQueryInstance(element)['trigger'](eventType);
838                        } else if (typeof document.createEvent == "function") {
839                            if (typeof element.dispatchEvent == "function") {
840                                var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
841                                var event = document.createEvent(eventCategory);
842                                event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
843                                element.dispatchEvent(event);
844                            }
845                            else
846                                throw new Error("The supplied element doesn't support dispatchEvent");
847                        } else if (useClickWorkaround && element.click) {
848                            element.click();
849                        } else if (typeof element.fireEvent != "undefined") {
850                            element.fireEvent("on" + eventType);
851                        } else {
852                            throw new Error("Browser doesn't support triggering events");
853                        }
854                    },
855
856                    unwrapObservable: function (value) {
857                        return ko.isObservable(value) ? value() : value;
858                    },
859
860                    peekObservable: function (value) {
861                        return ko.isObservable(value) ? value.peek() : value;
862                    },
863
864                    toggleDomNodeCssClass: toggleDomNodeCssClass,
865
866                    setTextContent: function (element, textContent) {
867                        var value = ko.utils.unwrapObservable(textContent);
868                        if ((value === null) || (value === undefined))
869                            value = "";
870
871                        // We need there to be exactly one child: a text node.
872                        // If there are no children, more than one, or if it's not a text node,
873                        // we'll clear everything and create a single text node.
874                        var innerTextNode = ko.virtualElements.firstChild(element);
875                        if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {
876                            ko.virtualElements.setDomNodeChildren(element, [element.ownerDocument.createTextNode(value)]);
877                        } else {
878                            innerTextNode.data = value;
879                        }
880
881                        ko.utils.forceRefresh(element);
882                    },
883
884                    setElementName: function (element, name) {
885                        element.name = name;
886
887                        // Workaround IE 6/7 issue
888                        // - https://github.com/SteveSanderson/knockout/issues/197
889                        // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
890                        if (ieVersion <= 7) {
891                            try {
892                                var escapedName = element.name.replace(/[&<>'"]/g, function (r) { return "&#" + r.charCodeAt(0) + ";"; });
893                                element.mergeAttributes(document.createElement("<input name='" + escapedName + "'/>"), false);
894                            }
895                            catch (e) { } // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"
896                        }
897                    },
898
899                    forceRefresh: function (node) {
900                        // Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209
901                        if (ieVersion >= 9) {
902                            // For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container
903                            var elem = node.nodeType == 1 ? node : node.parentNode;
904                            if (elem.style)
905                                elem.style.zoom = elem.style.zoom;
906                        }
907                    },
908
909                    ensureSelectElementIsRenderedCorrectly: function (selectElement) {
910                        // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
911                        // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
912                        // Also fixes IE7 and IE8 bug that causes selects to be zero width if enclosed by 'if' or 'with'. (See issue #839)
913                        if (ieVersion) {
914                            var originalWidth = selectElement.style.width;
915                            selectElement.style.width = 0;
916                            selectElement.style.width = originalWidth;
917                        }
918                    },
919
920                    range: function (min, max) {
921                        min = ko.utils.unwrapObservable(min);
922                        max = ko.utils.unwrapObservable(max);
923                        var result = [];
924                        for (var i = min; i <= max; i++)
925                            result.push(i);
926                        return result;
927                    },
928
929                    makeArray: function (arrayLikeObject) {
930                        var result = [];
931                        for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
932                            result.push(arrayLikeObject[i]);
933                        };
934                        return result;
935                    },
936
937                    createSymbolOrString: function (identifier) {
938                        return canUseSymbols ? Symbol(identifier) : identifier;
939                    },
940
941                    isIe6: isIe6,
942                    isIe7: isIe7,
943                    ieVersion: ieVersion,
944
945                    getFormFields: function (form, fieldName) {
946                        var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
947                        var isMatchingField = (typeof fieldName == 'string')
948                            ? function (field) { return field.name === fieldName }
949                            : function (field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
950                        var matches = [];
951                        for (var i = fields.length - 1; i >= 0; i--) {
952                            if (isMatchingField(fields[i]))
953                                matches.push(fields[i]);
954                        };
955                        return matches;
956                    },
957
958                    parseJson: function (jsonString) {
959                        if (typeof jsonString == "string") {
960                            jsonString = ko.utils.stringTrim(jsonString);
961                            if (jsonString) {
962                                if (JSON && JSON.parse) // Use native parsing where available
963                                    return JSON.parse(jsonString);
964                                return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
965                            }
966                        }
967                        return null;
968                    },
969
970                    stringifyJson: function (data, replacer, space) {   // replacer and space are optional
971                        if (!JSON || !JSON.stringify)
972                            throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
973                        return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
974                    },
975
976                    postJson: function (urlOrForm, data, options) {
977                        options = options || {};
978                        var params = options['params'] || {};
979                        var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
980                        var url = urlOrForm;
981
982                        // If we were given a form, use its 'action' URL and pick out any requested field values
983                        if ((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
984                            var originalForm = urlOrForm;
985                            url = originalForm.action;
986                            for (var i = includeFields.length - 1; i >= 0; i--) {
987                                var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
988                                for (var j = fields.length - 1; j >= 0; j--)
989                                    params[fields[j].name] = fields[j].value;
990                            }
991                        }
992
993                        data = ko.utils.unwrapObservable(data);
994                        var form = document.createElement("form");
995                        form.style.display = "none";
996                        form.action = url;
997                        form.method = "post";
998                        for (var key in data) {
999                            // Since 'data' this is a model object, we include all properties including those inherited from its prototype
1000                            var input = document.createElement("input");
1001                            input.type = "hidden";
1002                            input.name = key;
1003                            input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
1004                            form.appendChild(input);
1005                        }
1006                        objectForEach(params, function (key, value) {
1007                            var input = document.createElement("input");
1008                            input.type = "hidden";
1009                            input.name = key;
1010                            input.value = value;
1011                            form.appendChild(input);
1012                        });
1013                        document.body.appendChild(form);
1014                        options['submitter'] ? options['submitter'](form) : form.submit();
1015                        setTimeout(function () { form.parentNode.removeChild(form); }, 0);
1016                    }
1017                }
1018            }());
1019
1020            ko.exportSymbol('utils', ko.utils);
1021            ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
1022            ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
1023            ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
1024            ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
1025            ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
1026            ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
1027            ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
1028            ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
1029            ko.exportSymbol('utils.cloneNodes', ko.utils.cloneNodes);
1030            ko.exportSymbol('utils.createSymbolOrString', ko.utils.createSymbolOrString);
1031            ko.exportSymbol('utils.extend', ko.utils.extend);
1032            ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
1033            ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
1034            ko.exportSymbol('utils.objectMap', ko.utils.objectMap);
1035            ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);
1036            ko.exportSymbol('utils.postJson', ko.utils.postJson);
1037            ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
1038            ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
1039            ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
1040            ko.exportSymbol('utils.range', ko.utils.range);
1041            ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
1042            ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
1043            ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);
1044            ko.exportSymbol('utils.objectForEach', ko.utils.objectForEach);
1045            ko.exportSymbol('utils.addOrRemoveItem', ko.utils.addOrRemoveItem);
1046            ko.exportSymbol('utils.setTextContent', ko.utils.setTextContent);
1047            ko.exportSymbol('unwrap', ko.utils.unwrapObservable); // Convenient shorthand, because this is used so commonly
1048
1049            if (!Function.prototype['bind']) {
1050                // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
1051                // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
1052                Function.prototype['bind'] = function (object) {
1053                    var originalFunction = this;
1054                    if (arguments.length === 1) {
1055                        return function () {
1056                            return originalFunction.apply(object, arguments);
1057                        };
1058                    } else {
1059                        var partialArgs = Array.prototype.slice.call(arguments, 1);
1060                        return function () {
1061                            var args = partialArgs.slice(0);
1062                            args.push.apply(args, arguments);
1063                            return originalFunction.apply(object, args);
1064                        };
1065                    }
1066                };
1067            }
1068
1069            ko.utils.domData = new (function () {
1070                var uniqueId = 0;
1071                var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
1072                var dataStore = {};
1073
1074                var getDataForNode, clear;
1075                if (!ko.utils.ieVersion) {
1076                    // We considered using WeakMap, but it has a problem in IE 11 and Edge that prevents using
1077                    // it cross-window, so instead we just store the data directly on the node.
1078                    // See https://github.com/knockout/knockout/issues/2141
1079                    getDataForNode = function (node, createIfNotFound) {
1080                        var dataForNode = node[dataStoreKeyExpandoPropertyName];
1081                        if (!dataForNode && createIfNotFound) {
1082                            dataForNode = node[dataStoreKeyExpandoPropertyName] = {};
1083                        }
1084                        return dataForNode;
1085                    };
1086                    clear = function (node) {
1087                        if (node[dataStoreKeyExpandoPropertyName]) {
1088                            delete node[dataStoreKeyExpandoPropertyName];
1089                            return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
1090                        }
1091                        return false;
1092                    };
1093                } else {
1094                    // Old IE versions have memory issues if you store objects on the node, so we use a
1095                    // separate data storage and link to it from the node using a string key.
1096                    getDataForNode = function (node, createIfNotFound) {
1097                        var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
1098                        var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
1099                        if (!hasExistingDataStore) {
1100                            if (!createIfNotFound)
1101                                return undefined;
1102                            dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
1103                            dataStore[dataStoreKey] = {};
1104                        }
1105                        return dataStore[dataStoreKey];
1106                    };
1107                    clear = function (node) {
1108                        var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
1109                        if (dataStoreKey) {
1110                            delete dataStore[dataStoreKey];
1111                            node[dataStoreKeyExpandoPropertyName] = null;
1112                            return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
1113                        }
1114                        return false;
1115                    };
1116                }
1117
1118                return {
1119                    get: function (node, key) {
1120                        var dataForNode = getDataForNode(node, false);
1121                        return dataForNode && dataForNode[key];
1122                    },
1123                    set: function (node, key, value) {
1124                        // Make sure we don't actually create a new domData key if we are actually deleting a value
1125                        var dataForNode = getDataForNode(node, value !== undefined /* createIfNotFound */);
1126                        dataForNode && (dataForNode[key] = value);
1127                    },
1128                    getOrSet: function (node, key, value) {
1129                        var dataForNode = getDataForNode(node, true /* createIfNotFound */);
1130                        return dataForNode[key] || (dataForNode[key] = value);
1131                    },
1132                    clear: clear,
1133
1134                    nextKey: function () {
1135                        return (uniqueId++) + dataStoreKeyExpandoPropertyName;
1136                    }
1137                };
1138            })();
1139
1140            ko.exportSymbol('utils.domData', ko.utils.domData);
1141            ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully
1142
1143            ko.utils.domNodeDisposal = new (function () {
1144                var domDataKey = ko.utils.domData.nextKey();
1145                var cleanableNodeTypes = { 1: true, 8: true, 9: true };       // Element, Comment, Document
1146                var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document
1147
1148                function getDisposeCallbacksCollection(node, createIfNotFound) {
1149                    var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
1150                    if ((allDisposeCallbacks === undefined) && createIfNotFound) {
1151                        allDisposeCallbacks = [];
1152                        ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
1153                    }
1154                    return allDisposeCallbacks;
1155                }
1156                function destroyCallbacksCollection(node) {
1157                    ko.utils.domData.set(node, domDataKey, undefined);
1158                }
1159
1160                function cleanSingleNode(node) {
1161                    // Run all the dispose callbacks
1162                    var callbacks = getDisposeCallbacksCollection(node, false);
1163                    if (callbacks) {
1164                        callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
1165                        for (var i = 0; i < callbacks.length; i++)
1166                            callbacks[i](node);
1167                    }
1168
1169                    // Erase the DOM data
1170                    ko.utils.domData.clear(node);
1171
1172                    // Perform cleanup needed by external libraries (currently only jQuery, but can be extended)
1173                    ko.utils.domNodeDisposal["cleanExternalData"](node);
1174
1175                    // Clear any immediate-child comment nodes, as these wouldn't have been found by
1176                    // node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
1177                    if (cleanableNodeTypesWithDescendants[node.nodeType]) {
1178                        cleanNodesInList(node.childNodes, true/*onlyComments*/);
1179                    }
1180                }
1181
1182                function cleanNodesInList(nodeList, onlyComments) {
1183                    var cleanedNodes = [], lastCleanedNode;
1184                    for (var i = 0; i < nodeList.length; i++) {
1185                        if (!onlyComments || nodeList[i].nodeType === 8) {
1186                            cleanSingleNode(cleanedNodes[cleanedNodes.length] = lastCleanedNode = nodeList[i]);
1187                            if (nodeList[i] !== lastCleanedNode) {
1188                                while (i-- && ko.utils.arrayIndexOf(cleanedNodes, nodeList[i]) == -1) { }
1189                            }
1190                        }
1191                    }
1192                }
1193
1194                return {
1195                    addDisposeCallback: function (node, callback) {
1196                        if (typeof callback != "function")
1197                            throw new Error("Callback must be a function");
1198                        getDisposeCallbacksCollection(node, true).push(callback);
1199                    },
1200
1201                    removeDisposeCallback: function (node, callback) {
1202                        var callbacksCollection = getDisposeCallbacksCollection(node, false);
1203                        if (callbacksCollection) {
1204                            ko.utils.arrayRemoveItem(callbacksCollection, callback);
1205                            if (callbacksCollection.length == 0)
1206                                destroyCallbacksCollection(node);
1207                        }
1208                    },
1209
1210                    cleanNode: function (node) {
1211                        ko.dependencyDetection.ignore(function () {
1212                            // First clean this node, where applicable
1213                            if (cleanableNodeTypes[node.nodeType]) {
1214                                cleanSingleNode(node);
1215
1216                                // ... then its descendants, where applicable
1217                                if (cleanableNodeTypesWithDescendants[node.nodeType]) {
1218                                    cleanNodesInList(node.getElementsByTagName("*"));
1219                                }
1220                            }
1221                        });
1222
1223                        return node;
1224                    },
1225
1226                    removeNode: function (node) {
1227                        ko.cleanNode(node);
1228                        if (node.parentNode)
1229                            node.parentNode.removeChild(node);
1230                    },
1231
1232                    "cleanExternalData": function (node) {
1233                        // Special support for jQuery here because it's so commonly used.
1234                        // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
1235                        // so notify it to tear down any resources associated with the node & descendants here.
1236                        if (jQueryInstance && (typeof jQueryInstance['cleanData'] == "function"))
1237                            jQueryInstance['cleanData']([node]);
1238                    }
1239                };
1240            })();
1241            ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
1242            ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
1243            ko.exportSymbol('cleanNode', ko.cleanNode);
1244            ko.exportSymbol('removeNode', ko.removeNode);
1245            ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
1246            ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
1247            ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
1248            (function () {
1249                var none = [0, "", ""],
1250                    table = [1, "<table>", "</table>"],
1251                    tbody = [2, "<table><tbody>", "</tbody></table>"],
1252                    tr = [3, "<table><tbody><tr>", "</tr></tbody></table>"],
1253                    select = [1, "<select multiple='multiple'>", "</select>"],
1254                    lookup = {
1255                        'thead': table,
1256                        'tbody': table,
1257                        'tfoot': table,
1258                        'tr': tbody,
1259                        'td': tr,
1260                        'th': tr,
1261                        'option': select,
1262                        'optgroup': select
1263                    },
1264
1265                    // This is needed for old IE if you're *not* using either jQuery or innerShiv. Doesn't affect other cases.
1266                    mayRequireCreateElementHack = ko.utils.ieVersion <= 8;
1267
1268                function getWrap(tags) {
1269                    var m = tags.match(/^(?:<!--.*?-->\s*?)*?<([a-z]+)[\s>]/);
1270                    return (m && lookup[m[1]]) || none;
1271                }
1272
1273                function simpleHtmlParse(html, documentContext) {
1274                    documentContext || (documentContext = document);
1275                    var windowContext = documentContext['parentWindow'] || documentContext['defaultView'] || window;
1276
1277                    // Based on jQuery's "clean" function, but only accounting for table-related elements.
1278                    // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly
1279
1280                    // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
1281                    // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
1282                    // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
1283                    // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.
1284
1285                    // Trim whitespace, otherwise indexOf won't work as expected
1286                    var tags = ko.utils.stringTrim(html).toLowerCase(), div = documentContext.createElement("div"),
1287                        wrap = getWrap(tags),
1288                        depth = wrap[0];
1289
1290                    // Go to html and back, then peel off extra wrappers
1291                    // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
1292                    var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
1293                    if (typeof windowContext['innerShiv'] == "function") {
1294                        // Note that innerShiv is deprecated in favour of html5shiv. We should consider adding
1295                        // support for html5shiv (except if no explicit support is needed, e.g., if html5shiv
1296                        // somehow shims the native APIs so it just works anyway)
1297                        div.appendChild(windowContext['innerShiv'](markup));
1298                    } else {
1299                        if (mayRequireCreateElementHack) {
1300                            // The document.createElement('my-element') trick to enable custom elements in IE6-8
1301                            // only works if we assign innerHTML on an element associated with that document.
1302                            documentContext.body.appendChild(div);
1303                        }
1304
1305                        div.innerHTML = markup;
1306
1307                        if (mayRequireCreateElementHack) {
1308                            div.parentNode.removeChild(div);
1309                        }
1310                    }
1311
1312                    // Move to the right depth
1313                    while (depth--)
1314                        div = div.lastChild;
1315
1316                    return ko.utils.makeArray(div.lastChild.childNodes);
1317                }
1318
1319                function jQueryHtmlParse(html, documentContext) {
1320                    // jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
1321                    if (jQueryInstance['parseHTML']) {
1322                        return jQueryInstance['parseHTML'](html, documentContext) || []; // Ensure we always return an array and never null
1323                    } else {
1324                        // For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function.
1325                        var elems = jQueryInstance['clean']([html], documentContext);
1326
1327                        // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
1328                        // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
1329                        // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
1330                        if (elems && elems[0]) {
1331                            // Find the top-most parent element that's a direct child of a document fragment
1332                            var elem = elems[0];
1333                            while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
1334                                elem = elem.parentNode;
1335                            // ... then detach it
1336                            if (elem.parentNode)
1337                                elem.parentNode.removeChild(elem);
1338                        }
1339
1340                        return elems;
1341                    }
1342                }
1343
1344                ko.utils.parseHtmlFragment = function (html, documentContext) {
1345                    return jQueryInstance ?
1346                        jQueryHtmlParse(html, documentContext) :   // As below, benefit from jQuery's optimisations where possible
1347                        simpleHtmlParse(html, documentContext);  // ... otherwise, this simple logic will do in most common cases.
1348                };
1349
1350                ko.utils.parseHtmlForTemplateNodes = function (html, documentContext) {
1351                    var nodes = ko.utils.parseHtmlFragment(html, documentContext);
1352                    return (nodes.length && nodes[0].parentElement) || ko.utils.moveCleanedNodesToContainerElement(nodes);
1353                };
1354
1355                ko.utils.setHtml = function (node, html) {
1356                    ko.utils.emptyDomNode(node);
1357
1358                    // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
1359                    html = ko.utils.unwrapObservable(html);
1360
1361                    if ((html !== null) && (html !== undefined)) {
1362                        if (typeof html != 'string')
1363                            html = html.toString();
1364
1365                        // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
1366                        // for example <tr> elements which are not normally allowed to exist on their own.
1367                        // If you've referenced jQuery we'll use that rather than duplicating its code.
1368                        if (jQueryInstance) {
1369                            jQueryInstance(node)['html'](html);
1370                        } else {
1371                            // ... otherwise, use KO's own parsing logic.
1372                            var parsedNodes = ko.utils.parseHtmlFragment(html, node.ownerDocument);
1373                            for (var i = 0; i < parsedNodes.length; i++)
1374                                node.appendChild(parsedNodes[i]);
1375                        }
1376                    }
1377                };
1378            })();
1379
1380            ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
1381            ko.exportSymbol('utils.setHtml', ko.utils.setHtml);
1382
1383            ko.memoization = (function () {
1384                var memos = {};
1385
1386                function randomMax8HexChars() {
1387                    return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
1388                }
1389                function generateRandomId() {
1390                    return randomMax8HexChars() + randomMax8HexChars();
1391                }
1392                function findMemoNodes(rootNode, appendToArray) {
1393                    if (!rootNode)
1394                        return;
1395                    if (rootNode.nodeType == 8) {
1396                        var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
1397                        if (memoId != null)
1398                            appendToArray.push({ domNode: rootNode, memoId: memoId });
1399                    } else if (rootNode.nodeType == 1) {
1400                        for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
1401                            findMemoNodes(childNodes[i], appendToArray);
1402                    }
1403                }
1404
1405                return {
1406                    memoize: function (callback) {
1407                        if (typeof callback != "function")
1408                            throw new Error("You can only pass a function to ko.memoization.memoize()");
1409                        var memoId = generateRandomId();
1410                        memos[memoId] = callback;
1411                        return "<!--[ko_memo:" + memoId + "]-->";
1412                    },
1413
1414                    unmemoize: function (memoId, callbackParams) {
1415                        var callback = memos[memoId];
1416                        if (callback === undefined)
1417                            throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
1418                        try {
1419                            callback.apply(null, callbackParams || []);
1420                            return true;
1421                        }
1422                        finally { delete memos[memoId]; }
1423                    },
1424
1425                    unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
1426                        var memos = [];
1427                        findMemoNodes(domNode, memos);
1428                        for (var i = 0, j = memos.length; i < j; i++) {
1429                            var node = memos[i].domNode;
1430                            var combinedParams = [node];
1431                            if (extraCallbackParamsArray)
1432                                ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
1433                            ko.memoization.unmemoize(memos[i].memoId, combinedParams);
1434                            node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
1435                            if (node.parentNode)
1436                                node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
1437                        }
1438                    },
1439
1440                    parseMemoText: function (memoText) {
1441                        var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
1442                        return match ? match[1] : null;
1443                    }
1444                };
1445            })();
1446
1447            ko.exportSymbol('memoization', ko.memoization);
1448            ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
1449            ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
1450            ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
1451            ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
1452            ko.tasks = (function () {
1453                var scheduler,
1454                    taskQueue = [],
1455                    taskQueueLength = 0,
1456                    nextHandle = 1,
1457                    nextIndexToProcess = 0;
1458
1459                if (window['MutationObserver']) {
1460                    // Chrome 27+, Firefox 14+, IE 11+, Opera 15+, Safari 6.1+
1461                    // From https://github.com/petkaantonov/bluebird * Copyright (c) 2014 Petka Antonov * License: MIT
1462                    scheduler = (function (callback) {
1463                        var div = document.createElement("div");
1464                        new MutationObserver(callback).observe(div, { attributes: true });
1465                        return function () { div.classList.toggle("foo"); };
1466                    })(scheduledProcess);
1467                } else if (document && "onreadystatechange" in document.createElement("script")) {
1468                    // IE 6-10
1469                    // From https://github.com/YuzuJS/setImmediate * Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic Denicola * License: MIT
1470                    scheduler = function (callback) {
1471                        var script = document.createElement("script");
1472                        script.onreadystatechange = function () {
1473                            script.onreadystatechange = null;
1474                            document.documentElement.removeChild(script);
1475                            script = null;
1476                            callback();
1477                        };
1478                        document.documentElement.appendChild(script);
1479                    };
1480                } else {
1481                    scheduler = function (callback) {
1482                        setTimeout(callback, 0);
1483                    };
1484                }
1485
1486                function processTasks() {
1487                    if (taskQueueLength) {
1488                        // Each mark represents the end of a logical group of tasks and the number of these groups is
1489                        // limited to prevent unchecked recursion.
1490                        var mark = taskQueueLength, countMarks = 0;
1491
1492                        // nextIndexToProcess keeps track of where we are in the queue; processTasks can be called recursively without issue
1493                        for (var task; nextIndexToProcess < taskQueueLength;) {
1494                            if (task = taskQueue[nextIndexToProcess++]) {
1495                                if (nextIndexToProcess > mark) {
1496                                    if (++countMarks >= 5000) {
1497                                        nextIndexToProcess = taskQueueLength;   // skip all tasks remaining in the queue since any of them could be causing the recursion
1498                                        ko.utils.deferError(Error("'Too much recursion' after processing " + countMarks + " task groups."));
1499                                        break;
1500                                    }
1501                                    mark = taskQueueLength;
1502                                }
1503                                try {
1504                                    task();
1505                                } catch (ex) {
1506                                    ko.utils.deferError(ex);
1507                                }
1508                            }
1509                        }
1510                    }
1511                }
1512
1513                function scheduledProcess() {
1514                    processTasks();
1515
1516                    // Reset the queue
1517                    nextIndexToProcess = taskQueueLength = taskQueue.length = 0;
1518                }
1519
1520                function scheduleTaskProcessing() {
1521                    ko.tasks['scheduler'](scheduledProcess);
1522                }
1523
1524                var tasks = {
1525                    'scheduler': scheduler,     // Allow overriding the scheduler
1526
1527                    schedule: function (func) {
1528                        if (!taskQueueLength) {
1529                            scheduleTaskProcessing();
1530                        }
1531
1532                        taskQueue[taskQueueLength++] = func;
1533                        return nextHandle++;
1534                    },
1535
1536                    cancel: function (handle) {
1537                        var index = handle - (nextHandle - taskQueueLength);
1538                        if (index >= nextIndexToProcess && index < taskQueueLength) {
1539                            taskQueue[index] = null;
1540                        }
1541                    },
1542
1543                    // For testing only: reset the queue and return the previous queue length
1544                    'resetForTesting': function () {
1545                        var length = taskQueueLength - nextIndexToProcess;
1546                        nextIndexToProcess = taskQueueLength = taskQueue.length = 0;
1547                        return length;
1548                    },
1549
1550                    runEarly: processTasks
1551                };
1552
1553                return tasks;
1554            })();
1555
1556            ko.exportSymbol('tasks', ko.tasks);
1557            ko.exportSymbol('tasks.schedule', ko.tasks.schedule);
1558            //ko.exportSymbol('tasks.cancel', ko.tasks.cancel);  "cancel" isn't minified
1559            ko.exportSymbol('tasks.runEarly', ko.tasks.runEarly);
1560            ko.extenders = {
1561                'throttle': function (target, timeout) {
1562                    // Throttling means two things:
1563
1564                    // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
1565                    //     notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
1566                    target['throttleEvaluation'] = timeout;
1567
1568                    // (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
1569                    //     so the target cannot change value synchronously or faster than a certain rate
1570                    var writeTimeoutInstance = null;
1571                    return ko.dependentObservable({
1572                        'read': target,
1573                        'write': function (value) {
1574                            clearTimeout(writeTimeoutInstance);
1575                            writeTimeoutInstance = ko.utils.setTimeout(function () {
1576                                target(value);
1577                            }, timeout);
1578                        }
1579                    });
1580                },
1581
1582                'rateLimit': function (target, options) {
1583                    var timeout, method, limitFunction;
1584
1585                    if (typeof options == 'number') {
1586                        timeout = options;
1587                    } else {
1588                        timeout = options['timeout'];
1589                        method = options['method'];
1590                    }
1591
1592                    // rateLimit supersedes deferred updates
1593                    target._deferUpdates = false;
1594
1595                    limitFunction = typeof method == 'function' ? method : method == 'notifyWhenChangesStop' ? debounce : throttle;
1596                    target.limit(function (callback) {
1597                        return limitFunction(callback, timeout, options);
1598                    });
1599                },
1600
1601                'deferred': function (target, options) {
1602                    if (options !== true) {
1603                        throw new Error('The \'deferred\' extender only accepts the value \'true\', because it is not supported to turn deferral off once enabled.')
1604                    }
1605
1606                    if (!target._deferUpdates) {
1607                        target._deferUpdates = true;
1608                        target.limit(function (callback) {
1609                            var handle,
1610                                ignoreUpdates = false;
1611                            return function () {
1612                                if (!ignoreUpdates) {
1613                                    ko.tasks.cancel(handle);
1614                                    handle = ko.tasks.schedule(callback);
1615
1616                                    try {
1617                                        ignoreUpdates = true;
1618                                        target['notifySubscribers'](undefined, 'dirty');
1619                                    } finally {
1620                                        ignoreUpdates = false;
1621                                    }
1622                                }
1623                            };
1624                        });
1625                    }
1626                },
1627
1628                'notify': function (target, notifyWhen) {
1629                    target["equalityComparer"] = notifyWhen == "always" ?
1630                        null :  // null equalityComparer means to always notify
1631                        valuesArePrimitiveAndEqual;
1632                }
1633            };
1634
1635            var primitiveTypes = { 'undefined': 1, 'boolean': 1, 'number': 1, 'string': 1 };
1636            function valuesArePrimitiveAndEqual(a, b) {
1637                var oldValueIsPrimitive = (a === null) || (typeof (a) in primitiveTypes);
1638                return oldValueIsPrimitive ? (a === b) : false;
1639            }
1640
1641            function throttle(callback, timeout) {
1642                var timeoutInstance;
1643                return function () {
1644                    if (!timeoutInstance) {
1645                        timeoutInstance = ko.utils.setTimeout(function () {
1646                            timeoutInstance = undefined;
1647                            callback();
1648                        }, timeout);
1649                    }
1650                };
1651            }
1652
1653            function debounce(callback, timeout) {
1654                var timeoutInstance;
1655                return function () {
1656                    clearTimeout(timeoutInstance);
1657                    timeoutInstance = ko.utils.setTimeout(callback, timeout);
1658                };
1659            }
1660
1661            function applyExtenders(requestedExtenders) {
1662                var target = this;
1663                if (requestedExtenders) {
1664                    ko.utils.objectForEach(requestedExtenders, function (key, value) {
1665                        var extenderHandler = ko.extenders[key];
1666                        if (typeof extenderHandler == 'function') {
1667                            target = extenderHandler(target, value) || target;
1668                        }
1669                    });
1670                }
1671                return target;
1672            }
1673
1674            ko.exportSymbol('extenders', ko.extenders);
1675
1676            ko.subscription = function (target, callback, disposeCallback) {
1677                this._target = target;
1678                this._callback = callback;
1679                this._disposeCallback = disposeCallback;
1680                this._isDisposed = false;
1681                this._node = null;
1682                this._domNodeDisposalCallback = null;
1683                ko.exportProperty(this, 'dispose', this.dispose);
1684                ko.exportProperty(this, 'disposeWhenNodeIsRemoved', this.disposeWhenNodeIsRemoved);
1685            };
1686            ko.subscription.prototype.dispose = function () {
1687                var self = this;
1688                if (!self._isDisposed) {
1689                    if (self._domNodeDisposalCallback) {
1690                        ko.utils.domNodeDisposal.removeDisposeCallback(self._node, self._domNodeDisposalCallback);
1691                    }
1692                    self._isDisposed = true;
1693                    self._disposeCallback();
1694
1695                    self._target = self._callback = self._disposeCallback = self._node = self._domNodeDisposalCallback = null;
1696                }
1697            };
1698            ko.subscription.prototype.disposeWhenNodeIsRemoved = function (node) {
1699                this._node = node;
1700                ko.utils.domNodeDisposal.addDisposeCallback(node, this._domNodeDisposalCallback = this.dispose.bind(this));
1701            };
1702
1703            ko.subscribable = function () {
1704                ko.utils.setPrototypeOfOrExtend(this, ko_subscribable_fn);
1705                ko_subscribable_fn.init(this);
1706            }
1707
1708            var defaultEvent = "change";
1709
1710            // Moved out of "limit" to avoid the extra closure
1711            function limitNotifySubscribers(value, event) {
1712                if (!event || event === defaultEvent) {
1713                    this._limitChange(value);
1714                } else if (event === 'beforeChange') {
1715                    this._limitBeforeChange(value);
1716                } else {
1717                    this._origNotifySubscribers(value, event);
1718                }
1719            }
1720
1721            var ko_subscribable_fn = {
1722                init: function (instance) {
1723                    instance._subscriptions = { "change": [] };
1724                    instance._versionNumber = 1;
1725                },
1726
1727                subscribe: function (callback, callbackTarget, event) {
1728                    var self = this;
1729
1730                    event = event || defaultEvent;
1731                    var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
1732
1733                    var subscription = new ko.subscription(self, boundCallback, function () {
1734                        ko.utils.arrayRemoveItem(self._subscriptions[event], subscription);
1735                        if (self.afterSubscriptionRemove)
1736                            self.afterSubscriptionRemove(event);
1737                    });
1738
1739                    if (self.beforeSubscriptionAdd)
1740                        self.beforeSubscriptionAdd(event);
1741
1742                    if (!self._subscriptions[event])
1743                        self._subscriptions[event] = [];
1744                    self._subscriptions[event].push(subscription);
1745
1746                    return subscription;
1747                },
1748
1749                "notifySubscribers": function (valueToNotify, event) {
1750                    event = event || defaultEvent;
1751                    if (event === defaultEvent) {
1752                        this.updateVersion();
1753                    }
1754                    if (this.hasSubscriptionsForEvent(event)) {
1755                        var subs = event === defaultEvent && this._changeSubscriptions || this._subscriptions[event].slice(0);
1756                        try {
1757                            ko.dependencyDetection.begin(); // Begin suppressing dependency detection (by setting the top frame to undefined)
1758                            for (var i = 0, subscription; subscription = subs[i]; ++i) {
1759                                // In case a subscription was disposed during the arrayForEach cycle, check
1760                                // for isDisposed on each subscription before invoking its callback
1761                                if (!subscription._isDisposed)
1762                                    subscription._callback(valueToNotify);
1763                            }
1764                        } finally {
1765                            ko.dependencyDetection.end(); // End suppressing dependency detection
1766                        }
1767                    }
1768                },
1769
1770                getVersion: function () {
1771                    return this._versionNumber;
1772                },
1773
1774                hasChanged: function (versionToCheck) {
1775                    return this.getVersion() !== versionToCheck;
1776                },
1777
1778                updateVersion: function () {
1779                    ++this._versionNumber;
1780                },
1781
1782                limit: function (limitFunction) {
1783                    var self = this, selfIsObservable = ko.isObservable(self),
1784                        ignoreBeforeChange, notifyNextChange, previousValue, pendingValue, didUpdate,
1785                        beforeChange = 'beforeChange';
1786
1787                    if (!self._origNotifySubscribers) {
1788                        self._origNotifySubscribers = self["notifySubscribers"];
1789                        self["notifySubscribers"] = limitNotifySubscribers;
1790                    }
1791
1792                    var finish = limitFunction(function () {
1793                        self._notificationIsPending = false;
1794
1795                        // If an observable provided a reference to itself, access it to get the latest value.
1796                        // This allows computed observables to delay calculating their value until needed.
1797                        if (selfIsObservable && pendingValue === self) {
1798                            pendingValue = self._evalIfChanged ? self._evalIfChanged() : self();
1799                        }
1800                        var shouldNotify = notifyNextChange || (didUpdate && self.isDifferent(previousValue, pendingValue));
1801
1802                        didUpdate = notifyNextChange = ignoreBeforeChange = false;
1803
1804                        if (shouldNotify) {
1805                            self._origNotifySubscribers(previousValue = pendingValue);
1806                        }
1807                    });
1808
1809                    self._limitChange = function (value, isDirty) {
1810                        if (!isDirty || !self._notificationIsPending) {
1811                            didUpdate = !isDirty;
1812                        }
1813                        self._changeSubscriptions = self._subscriptions[defaultEvent].slice(0);
1814                        self._notificationIsPending = ignoreBeforeChange = true;
1815                        pendingValue = value;
1816                        finish();
1817                    };
1818                    self._limitBeforeChange = function (value) {
1819                        if (!ignoreBeforeChange) {
1820                            previousValue = value;
1821                            self._origNotifySubscribers(value, beforeChange);
1822                        }
1823                    };
1824                    self._recordUpdate = function () {
1825                        didUpdate = true;
1826                    };
1827                    self._notifyNextChangeIfValueIsDifferent = function () {
1828                        if (self.isDifferent(previousValue, self.peek(true /*evaluate*/))) {
1829                            notifyNextChange = true;
1830                        }
1831                    };
1832                },
1833
1834                hasSubscriptionsForEvent: function (event) {
1835                    return this._subscriptions[event] && this._subscriptions[event].length;
1836                },
1837
1838                getSubscriptionsCount: function (event) {
1839                    if (event) {
1840                        return this._subscriptions[event] && this._subscriptions[event].length || 0;
1841                    } else {
1842                        var total = 0;
1843                        ko.utils.objectForEach(this._subscriptions, function (eventName, subscriptions) {
1844                            if (eventName !== 'dirty')
1845                                total += subscriptions.length;
1846                        });
1847                        return total;
1848                    }
1849                },
1850
1851                isDifferent: function (oldValue, newValue) {
1852                    return !this['equalityComparer'] || !this['equalityComparer'](oldValue, newValue);
1853                },
1854
1855                toString: function () {
1856                    return '[object Object]'
1857                },
1858
1859                extend: applyExtenders
1860            };
1861
1862            ko.exportProperty(ko_subscribable_fn, 'init', ko_subscribable_fn.init);
1863            ko.exportProperty(ko_subscribable_fn, 'subscribe', ko_subscribable_fn.subscribe);
1864            ko.exportProperty(ko_subscribable_fn, 'extend', ko_subscribable_fn.extend);
1865            ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_fn.getSubscriptionsCount);
1866
1867            // For browsers that support proto assignment, we overwrite the prototype of each
1868            // observable instance. Since observables are functions, we need Function.prototype
1869            // to still be in the prototype chain.
1870            if (ko.utils.canSetPrototype) {
1871                ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype);
1872            }
1873
1874            ko.subscribable['fn'] = ko_subscribable_fn;
1875
1876
1877            ko.isSubscribable = function (instance) {
1878                return instance != null && typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
1879            };
1880
1881            ko.exportSymbol('subscribable', ko.subscribable);
1882            ko.exportSymbol('isSubscribable', ko.isSubscribable);
1883
1884            ko.computedContext = ko.dependencyDetection = (function () {
1885                var outerFrames = [],
1886                    currentFrame,
1887                    lastId = 0;
1888
1889                // Return a unique ID that can be assigned to an observable for dependency tracking.
1890                // Theoretically, you could eventually overflow the number storage size, resulting
1891                // in duplicate IDs. But in JavaScript, the largest exact integral value is 2^53
1892                // or 9,007,199,254,740,992. If you created 1,000,000 IDs per second, it would
1893                // take over 285 years to reach that number.
1894                // Reference http://blog.vjeux.com/2010/javascript/javascript-max_int-number-limits.html
1895                function getId() {
1896                    return ++lastId;
1897                }
1898
1899                function begin(options) {
1900                    outerFrames.push(currentFrame);
1901                    currentFrame = options;
1902                }
1903
1904                function end() {
1905                    currentFrame = outerFrames.pop();
1906                }
1907
1908                return {
1909                    begin: begin,
1910
1911                    end: end,
1912
1913                    registerDependency: function (subscribable) {
1914                        if (currentFrame) {
1915                            if (!ko.isSubscribable(subscribable))
1916                                throw new Error("Only subscribable things can act as dependencies");
1917                            currentFrame.callback.call(currentFrame.callbackTarget, subscribable, subscribable._id || (subscribable._id = getId()));
1918                        }
1919                    },
1920
1921                    ignore: function (callback, callbackTarget, callbackArgs) {
1922                        try {
1923                            begin();
1924                            return callback.apply(callbackTarget, callbackArgs || []);
1925                        } finally {
1926                            end();
1927                        }
1928                    },
1929
1930                    getDependenciesCount: function () {
1931                        if (currentFrame)
1932                            return currentFrame.computed.getDependenciesCount();
1933                    },
1934
1935                    getDependencies: function () {
1936                        if (currentFrame)
1937                            return currentFrame.computed.getDependencies();
1938                    },
1939
1940                    isInitial: function () {
1941                        if (currentFrame)
1942                            return currentFrame.isInitial;
1943                    },
1944
1945                    computed: function () {
1946                        if (currentFrame)
1947                            return currentFrame.computed;
1948                    }
1949                };
1950            })();
1951
1952            ko.exportSymbol('computedContext', ko.computedContext);
1953            ko.exportSymbol('computedContext.getDependenciesCount', ko.computedContext.getDependenciesCount);
1954            ko.exportSymbol('computedContext.getDependencies', ko.computedContext.getDependencies);
1955            ko.exportSymbol('computedContext.isInitial', ko.computedContext.isInitial);
1956            ko.exportSymbol('computedContext.registerDependency', ko.computedContext.registerDependency);
1957
1958            ko.exportSymbol('ignoreDependencies', ko.ignoreDependencies = ko.dependencyDetection.ignore);
1959            var observableLatestValue = ko.utils.createSymbolOrString('_latestValue');
1960
1961            ko.observable = function (initialValue) {
1962                function observable() {
1963                    if (arguments.length > 0) {
1964                        // Write
1965
1966                        // Ignore writes if the value hasn't changed
1967                        if (observable.isDifferent(observable[observableLatestValue], arguments[0])) {
1968                            observable.valueWillMutate();
1969                            observable[observableLatestValue] = arguments[0];
1970                            observable.valueHasMutated();
1971                        }
1972                        return this; // Permits chained assignments
1973                    }
1974                    else {
1975                        // Read
1976                        ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
1977                        return observable[observableLatestValue];
1978                    }
1979                }
1980
1981                observable[observableLatestValue] = initialValue;
1982
1983                // Inherit from 'subscribable'
1984                if (!ko.utils.canSetPrototype) {
1985                    // 'subscribable' won't be on the prototype chain unless we put it there directly
1986                    ko.utils.extend(observable, ko.subscribable['fn']);
1987                }
1988                ko.subscribable['fn'].init(observable);
1989
1990                // Inherit from 'observable'
1991                ko.utils.setPrototypeOfOrExtend(observable, observableFn);
1992
1993                if (ko.options['deferUpdates']) {
1994                    ko.extenders['deferred'](observable, true);
1995                }
1996
1997                return observable;
1998            }
1999
2000            // Define prototype for observables
2001            var observableFn = {
2002                'equalityComparer': valuesArePrimitiveAndEqual,
2003                peek: function () { return this[observableLatestValue]; },
2004                valueHasMutated: function () {
2005                    this['notifySubscribers'](this[observableLatestValue], 'spectate');
2006                    this['notifySubscribers'](this[observableLatestValue]);
2007                },
2008                valueWillMutate: function () { this['notifySubscribers'](this[observableLatestValue], 'beforeChange'); }
2009            };
2010
2011            // Note that for browsers that don't support proto assignment, the
2012            // inheritance chain is created manually in the ko.observable constructor
2013            if (ko.utils.canSetPrototype) {
2014                ko.utils.setPrototypeOf(observableFn, ko.subscribable['fn']);
2015            }
2016
2017            var protoProperty = ko.observable.protoProperty = '__ko_proto__';
2018            observableFn[protoProperty] = ko.observable;
2019
2020            ko.isObservable = function (instance) {
2021                var proto = typeof instance == 'function' && instance[protoProperty];
2022                if (proto && proto !== observableFn[protoProperty] && proto !== ko.computed['fn'][protoProperty]) {
2023                    throw Error("Invalid object that looks like an observable; possibly from another Knockout instance");
2024                }
2025                return !!proto;
2026            };
2027
2028            ko.isWriteableObservable = function (instance) {
2029                return (typeof instance == 'function' && (
2030                    (instance[protoProperty] === observableFn[protoProperty]) ||  // Observable
2031                    (instance[protoProperty] === ko.computed['fn'][protoProperty] && instance.hasWriteFunction)));   // Writable computed observable
2032            };
2033
2034            ko.exportSymbol('observable', ko.observable);
2035            ko.exportSymbol('isObservable', ko.isObservable);
2036            ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
2037            ko.exportSymbol('isWritableObservable', ko.isWriteableObservable);
2038            ko.exportSymbol('observable.fn', observableFn);
2039            ko.exportProperty(observableFn, 'peek', observableFn.peek);
2040            ko.exportProperty(observableFn, 'valueHasMutated', observableFn.valueHasMutated);
2041            ko.exportProperty(observableFn, 'valueWillMutate', observableFn.valueWillMutate);
2042            ko.observableArray = function (initialValues) {
2043                initialValues = initialValues || [];
2044
2045                if (typeof initialValues != 'object' || !('length' in initialValues))
2046                    throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
2047
2048                var result = ko.observable(initialValues);
2049                ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']);
2050                return result.extend({ 'trackArrayChanges': true });
2051            };
2052
2053            ko.observableArray['fn'] = {
2054                'remove': function (valueOrPredicate) {
2055                    var underlyingArray = this.peek();
2056                    var removedValues = [];
2057                    var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
2058                    for (var i = 0; i < underlyingArray.length; i++) {
2059                        var value = underlyingArray[i];
2060                        if (predicate(value)) {
2061                            if (removedValues.length === 0) {
2062                                this.valueWillMutate();
2063                            }
2064                            if (underlyingArray[i] !== value) {
2065                                throw Error("Array modified during remove; cannot remove item");
2066                            }
2067                            removedValues.push(value);
2068                            underlyingArray.splice(i, 1);
2069                            i--;
2070                        }
2071                    }
2072                    if (removedValues.length) {
2073                        this.valueHasMutated();
2074                    }
2075                    return removedValues;
2076                },
2077
2078                'removeAll': function (arrayOfValues) {
2079                    // If you passed zero args, we remove everything
2080                    if (arrayOfValues === undefined) {
2081                        var underlyingArray = this.peek();
2082                        var allValues = underlyingArray.slice(0);
2083                        this.valueWillMutate();
2084                        underlyingArray.splice(0, underlyingArray.length);
2085                        this.valueHasMutated();
2086                        return allValues;
2087                    }
2088                    // If you passed an arg, we interpret it as an array of entries to remove
2089                    if (!arrayOfValues)
2090                        return [];
2091                    return this['remove'](function (value) {
2092                        return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
2093                    });
2094                },
2095
2096                'destroy': function (valueOrPredicate) {
2097                    var underlyingArray = this.peek();
2098                    var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
2099                    this.valueWillMutate();
2100                    for (var i = underlyingArray.length - 1; i >= 0; i--) {
2101                        var value = underlyingArray[i];
2102                        if (predicate(value))
2103                            value["_destroy"] = true;
2104                    }
2105                    this.valueHasMutated();
2106                },
2107
2108                'destroyAll': function (arrayOfValues) {
2109                    // If you passed zero args, we destroy everything
2110                    if (arrayOfValues === undefined)
2111                        return this['destroy'](function () { return true });
2112
2113                    // If you passed an arg, we interpret it as an array of entries to destroy
2114                    if (!arrayOfValues)
2115                        return [];
2116                    return this['destroy'](function (value) {
2117                        return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
2118                    });
2119                },
2120
2121                'indexOf': function (item) {
2122                    var underlyingArray = this();
2123                    return ko.utils.arrayIndexOf(underlyingArray, item);
2124                },
2125
2126                'replace': function (oldItem, newItem) {
2127                    var index = this['indexOf'](oldItem);
2128                    if (index >= 0) {
2129                        this.valueWillMutate();
2130                        this.peek()[index] = newItem;
2131                        this.valueHasMutated();
2132                    }
2133                },
2134
2135                'sorted': function (compareFunction) {
2136                    var arrayCopy = this().slice(0);
2137                    return compareFunction ? arrayCopy.sort(compareFunction) : arrayCopy.sort();
2138                },
2139
2140                'reversed': function () {
2141                    return this().slice(0).reverse();
2142                }
2143            };
2144
2145            // Note that for browsers that don't support proto assignment, the
2146            // inheritance chain is created manually in the ko.observableArray constructor
2147            if (ko.utils.canSetPrototype) {
2148                ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
2149            }
2150
2151            // Populate ko.observableArray.fn with read/write functions from native arrays
2152            // Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
2153            // because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
2154            ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
2155                ko.observableArray['fn'][methodName] = function () {
2156                    // Use "peek" to avoid creating a subscription in any computed that we're executing in the context of
2157                    // (for consistency with mutating regular observables)
2158                    var underlyingArray = this.peek();
2159                    this.valueWillMutate();
2160                    this.cacheDiffForKnownOperation(underlyingArray, methodName, arguments);
2161                    var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
2162                    this.valueHasMutated();
2163                    // The native sort and reverse methods return a reference to the array, but it makes more sense to return the observable array instead.
2164                    return methodCallResult === underlyingArray ? this : methodCallResult;
2165                };
2166            });
2167
2168            // Populate ko.observableArray.fn with read-only functions from native arrays
2169            ko.utils.arrayForEach(["slice"], function (methodName) {
2170                ko.observableArray['fn'][methodName] = function () {
2171                    var underlyingArray = this();
2172                    return underlyingArray[methodName].apply(underlyingArray, arguments);
2173                };
2174            });
2175
2176            ko.isObservableArray = function (instance) {
2177                return ko.isObservable(instance)
2178                    && typeof instance["remove"] == "function"
2179                    && typeof instance["push"] == "function";
2180            };
2181
2182            ko.exportSymbol('observableArray', ko.observableArray);
2183            ko.exportSymbol('isObservableArray', ko.isObservableArray);
2184            var arrayChangeEventName = 'arrayChange';
2185            ko.extenders['trackArrayChanges'] = function (target, options) {
2186                // Use the provided options--each call to trackArrayChanges overwrites the previously set options
2187                target.compareArrayOptions = {};
2188                if (options && typeof options == "object") {
2189                    ko.utils.extend(target.compareArrayOptions, options);
2190                }
2191                target.compareArrayOptions['sparse'] = true;
2192
2193                // Only modify the target observable once
2194                if (target.cacheDiffForKnownOperation) {
2195                    return;
2196                }
2197                var trackingChanges = false,
2198                    cachedDiff = null,
2199                    changeSubscription,
2200                    spectateSubscription,
2201                    pendingChanges = 0,
2202                    previousContents,
2203                    underlyingBeforeSubscriptionAddFunction = target.beforeSubscriptionAdd,
2204                    underlyingAfterSubscriptionRemoveFunction = target.afterSubscriptionRemove;
2205
2206                // Watch "subscribe" calls, and for array change events, ensure change tracking is enabled
2207                target.beforeSubscriptionAdd = function (event) {
2208                    if (underlyingBeforeSubscriptionAddFunction) {
2209                        underlyingBeforeSubscriptionAddFunction.call(target, event);
2210                    }
2211                    if (event === arrayChangeEventName) {
2212                        trackChanges();
2213                    }
2214                };
2215                // Watch "dispose" calls, and for array change events, ensure change tracking is disabled when all are disposed
2216                target.afterSubscriptionRemove = function (event) {
2217                    if (underlyingAfterSubscriptionRemoveFunction) {
2218                        underlyingAfterSubscriptionRemoveFunction.call(target, event);
2219                    }
2220                    if (event === arrayChangeEventName && !target.hasSubscriptionsForEvent(arrayChangeEventName)) {
2221                        if (changeSubscription) {
2222                            changeSubscription.dispose();
2223                        }
2224                        if (spectateSubscription) {
2225                            spectateSubscription.dispose();
2226                        }
2227                        spectateSubscription = changeSubscription = null;
2228                        trackingChanges = false;
2229                        previousContents = undefined;
2230                    }
2231                };
2232
2233                function trackChanges() {
2234                    if (trackingChanges) {
2235                        // Whenever there's a new subscription and there are pending notifications, make sure all previous
2236                        // subscriptions are notified of the change so that all subscriptions are in sync.
2237                        notifyChanges();
2238                        return;
2239                    }
2240
2241                    trackingChanges = true;
2242
2243                    // Track how many times the array actually changed value
2244                    spectateSubscription = target.subscribe(function () {
2245                        ++pendingChanges;
2246                    }, null, "spectate");
2247
2248                    // Each time the array changes value, capture a clone so that on the next
2249                    // change it's possible to produce a diff
2250                    previousContents = [].concat(target.peek() || []);
2251                    cachedDiff = null;
2252                    changeSubscription = target.subscribe(notifyChanges);
2253
2254                    function notifyChanges() {
2255                        if (pendingChanges) {
2256                            // Make a copy of the current contents and ensure it's an array
2257                            var currentContents = [].concat(target.peek() || []), changes;
2258
2259                            // Compute the diff and issue notifications, but only if someone is listening
2260                            if (target.hasSubscriptionsForEvent(arrayChangeEventName)) {
2261                                changes = getChanges(previousContents, currentContents);
2262                            }
2263
2264                            // Eliminate references to the old, removed items, so they can be GCed
2265                            previousContents = currentContents;
2266                            cachedDiff = null;
2267                            pendingChanges = 0;
2268
2269                            if (changes && changes.length) {
2270                                target['notifySubscribers'](changes, arrayChangeEventName);
2271                            }
2272                        }
2273                    }
2274                }
2275
2276                function getChanges(previousContents, currentContents) {
2277                    // We try to re-use cached diffs.
2278                    // The scenarios where pendingChanges > 1 are when using rate limiting or deferred updates,
2279                    // which without this check would not be compatible with arrayChange notifications. Normally,
2280                    // notifications are issued immediately so we wouldn't be queueing up more than one.
2281                    if (!cachedDiff || pendingChanges > 1) {
2282                        cachedDiff = ko.utils.compareArrays(previousContents, currentContents, target.compareArrayOptions);
2283                    }
2284
2285                    return cachedDiff;
2286                }
2287
2288                target.cacheDiffForKnownOperation = function (rawArray, operationName, args) {
2289                    // Only run if we're currently tracking changes for this observable array
2290                    // and there aren't any pending deferred notifications.
2291                    if (!trackingChanges || pendingChanges) {
2292                        return;
2293                    }
2294                    var diff = [],
2295                        arrayLength = rawArray.length,
2296                        argsLength = args.length,
2297                        offset = 0;
2298
2299                    function pushDiff(status, value, index) {
2300                        return diff[diff.length] = { 'status': status, 'value': value, 'index': index };
2301                    }
2302                    switch (operationName) {
2303                        case 'push':
2304                            offset = arrayLength;
2305                        case 'unshift':
2306                            for (var index = 0; index < argsLength; index++) {
2307                                pushDiff('added', args[index], offset + index);
2308                            }
2309                            break;
2310
2311                        case 'pop':
2312                            offset = arrayLength - 1;
2313                        case 'shift':
2314                            if (arrayLength) {
2315                                pushDiff('deleted', rawArray[offset], offset);
2316                            }
2317                            break;
2318
2319                        case 'splice':
2320                            // Negative start index means 'from end of array'. After that we clamp to [0...arrayLength].
2321                            // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
2322                            var startIndex = Math.min(Math.max(0, args[0] < 0 ? arrayLength + args[0] : args[0]), arrayLength),
2323                                endDeleteIndex = argsLength === 1 ? arrayLength : Math.min(startIndex + (args[1] || 0), arrayLength),
2324                                endAddIndex = startIndex + argsLength - 2,
2325                                endIndex = Math.max(endDeleteIndex, endAddIndex),
2326                                additions = [], deletions = [];
2327                            for (var index = startIndex, argsIndex = 2; index < endIndex; ++index, ++argsIndex) {
2328                                if (index < endDeleteIndex)
2329                                    deletions.push(pushDiff('deleted', rawArray[index], index));
2330                                if (index < endAddIndex)
2331                                    additions.push(pushDiff('added', args[argsIndex], index));
2332                            }
2333                            ko.utils.findMovesInArrayComparison(deletions, additions);
2334                            break;
2335
2336                        default:
2337                            return;
2338                    }
2339                    cachedDiff = diff;
2340                };
2341            };
2342            var computedState = ko.utils.createSymbolOrString('_state');
2343
2344            ko.computed = ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
2345                if (typeof evaluatorFunctionOrOptions === "object") {
2346                    // Single-parameter syntax - everything is on this "options" param
2347                    options = evaluatorFunctionOrOptions;
2348                } else {
2349                    // Multi-parameter syntax - construct the options according to the params passed
2350                    options = options || {};
2351                    if (evaluatorFunctionOrOptions) {
2352                        options["read"] = evaluatorFunctionOrOptions;
2353                    }
2354                }
2355                if (typeof options["read"] != "function")
2356                    throw Error("Pass a function that returns the value of the ko.computed");
2357
2358                var writeFunction = options["write"];
2359                var state = {
2360                    latestValue: undefined,
2361                    isStale: true,
2362                    isDirty: true,
2363                    isBeingEvaluated: false,
2364                    suppressDisposalUntilDisposeWhenReturnsFalse: false,
2365                    isDisposed: false,
2366                    pure: false,
2367                    isSleeping: false,
2368                    readFunction: options["read"],
2369                    evaluatorFunctionTarget: evaluatorFunctionTarget || options["owner"],
2370                    disposeWhenNodeIsRemoved: options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
2371                    disposeWhen: options["disposeWhen"] || options.disposeWhen,
2372                    domNodeDisposalCallback: null,
2373                    dependencyTracking: {},
2374                    dependenciesCount: 0,
2375                    evaluationTimeoutInstance: null
2376                };
2377
2378                function computedObservable() {
2379                    if (arguments.length > 0) {
2380                        if (typeof writeFunction === "function") {
2381                            // Writing a value
2382                            writeFunction.apply(state.evaluatorFunctionTarget, arguments);
2383                        } else {
2384                            throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
2385                        }
2386                        return this; // Permits chained assignments
2387                    } else {
2388                        // Reading the value
2389                        if (!state.isDisposed) {
2390                            ko.dependencyDetection.registerDependency(computedObservable);
2391                        }
2392                        if (state.isDirty || (state.isSleeping && computedObservable.haveDependenciesChanged())) {
2393                            computedObservable.evaluateImmediate();
2394                        }
2395                        return state.latestValue;
2396                    }
2397                }
2398
2399                computedObservable[computedState] = state;
2400                computedObservable.hasWriteFunction = typeof writeFunction === "function";
2401
2402                // Inherit from 'subscribable'
2403                if (!ko.utils.canSetPrototype) {
2404                    // 'subscribable' won't be on the prototype chain unless we put it there directly
2405                    ko.utils.extend(computedObservable, ko.subscribable['fn']);
2406                }
2407                ko.subscribable['fn'].init(computedObservable);
2408
2409                // Inherit from 'computed'
2410                ko.utils.setPrototypeOfOrExtend(computedObservable, computedFn);
2411
2412                if (options['pure']) {
2413                    state.pure = true;
2414                    state.isSleeping = true;     // Starts off sleeping; will awake on the first subscription
2415                    ko.utils.extend(computedObservable, pureComputedOverrides);
2416                } else if (options['deferEvaluation']) {
2417                    ko.utils.extend(computedObservable, deferEvaluationOverrides);
2418                }
2419
2420                if (ko.options['deferUpdates']) {
2421                    ko.extenders['deferred'](computedObservable, true);
2422                }
2423
2424                if (DEBUG) {
2425                    // #1731 - Aid debugging by exposing the computed's options
2426                    computedObservable["_options"] = options;
2427                }
2428
2429                if (state.disposeWhenNodeIsRemoved) {
2430                    // Since this computed is associated with a DOM node, and we don't want to dispose the computed
2431                    // until the DOM node is *removed* from the document (as opposed to never having been in the document),
2432                    // we'll prevent disposal until "disposeWhen" first returns false.
2433                    state.suppressDisposalUntilDisposeWhenReturnsFalse = true;
2434
2435                    // disposeWhenNodeIsRemoved: true can be used to opt into the "only dispose after first false result"
2436                    // behaviour even if there's no specific node to watch. In that case, clear the option so we don't try
2437                    // to watch for a non-node's disposal. This technique is intended for KO's internal use only and shouldn't
2438                    // be documented or used by application code, as it's likely to change in a future version of KO.
2439                    if (!state.disposeWhenNodeIsRemoved.nodeType) {
2440                        state.disposeWhenNodeIsRemoved = null;
2441                    }
2442                }
2443
2444                // Evaluate, unless sleeping or deferEvaluation is true
2445                if (!state.isSleeping && !options['deferEvaluation']) {
2446                    computedObservable.evaluateImmediate();
2447                }
2448
2449                // Attach a DOM node disposal callback so that the computed will be proactively disposed as soon as the node is
2450                // removed using ko.removeNode. But skip if isActive is false (there will never be any dependencies to dispose).
2451                if (state.disposeWhenNodeIsRemoved && computedObservable.isActive()) {
2452                    ko.utils.domNodeDisposal.addDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback = function () {
2453                        computedObservable.dispose();
2454                    });
2455                }
2456
2457                return computedObservable;
2458            };
2459
2460            // Utility function that disposes a given dependencyTracking entry
2461            function computedDisposeDependencyCallback(id, entryToDispose) {
2462                if (entryToDispose !== null && entryToDispose.dispose) {
2463                    entryToDispose.dispose();
2464                }
2465            }
2466
2467            // This function gets called each time a dependency is detected while evaluating a computed.
2468            // It's factored out as a shared function to avoid creating unnecessary function instances during evaluation.
2469            function computedBeginDependencyDetectionCallback(subscribable, id) {
2470                var computedObservable = this.computedObservable,
2471                    state = computedObservable[computedState];
2472                if (!state.isDisposed) {
2473                    if (this.disposalCount && this.disposalCandidates[id]) {
2474                        // Don't want to dispose this subscription, as it's still being used
2475                        computedObservable.addDependencyTracking(id, subscribable, this.disposalCandidates[id]);
2476                        this.disposalCandidates[id] = null; // No need to actually delete the property - disposalCandidates is a transient object anyway
2477                        --this.disposalCount;
2478                    } else if (!state.dependencyTracking[id]) {
2479                        // Brand new subscription - add it
2480                        computedObservable.addDependencyTracking(id, subscribable, state.isSleeping ? { _target: subscribable } : computedObservable.subscribeToDependency(subscribable));
2481                    }
2482                    // If the observable we've accessed has a pending notification, ensure we get notified of the actual final value (bypass equality checks)
2483                    if (subscribable._notificationIsPending) {
2484                        subscribable._notifyNextChangeIfValueIsDifferent();
2485                    }
2486                }
2487            }
2488
2489            var computedFn = {
2490                "equalityComparer": valuesArePrimitiveAndEqual,
2491                getDependenciesCount: function () {
2492                    return this[computedState].dependenciesCount;
2493                },
2494                getDependencies: function () {
2495                    var dependencyTracking = this[computedState].dependencyTracking, dependentObservables = [];
2496
2497                    ko.utils.objectForEach(dependencyTracking, function (id, dependency) {
2498                        dependentObservables[dependency._order] = dependency._target;
2499                    });
2500
2501                    return dependentObservables;
2502                },
2503                hasAncestorDependency: function (obs) {
2504                    if (!this[computedState].dependenciesCount) {
2505                        return false;
2506                    }
2507                    var dependencies = this.getDependencies();
2508                    if (ko.utils.arrayIndexOf(dependencies, obs) !== -1) {
2509                        return true;
2510                    }
2511                    return !!ko.utils.arrayFirst(dependencies, function (dep) {
2512                        return dep.hasAncestorDependency && dep.hasAncestorDependency(obs);
2513                    });
2514                },
2515                addDependencyTracking: function (id, target, trackingObj) {
2516                    if (this[computedState].pure && target === this) {
2517                        throw Error("A 'pure' computed must not be called recursively");
2518                    }
2519
2520                    this[computedState].dependencyTracking[id] = trackingObj;
2521                    trackingObj._order = this[computedState].dependenciesCount++;
2522                    trackingObj._version = target.getVersion();
2523                },
2524                haveDependenciesChanged: function () {
2525                    var id, dependency, dependencyTracking = this[computedState].dependencyTracking;
2526                    for (id in dependencyTracking) {
2527                        if (Object.prototype.hasOwnProperty.call(dependencyTracking, id)) {
2528                            dependency = dependencyTracking[id];
2529                            if ((this._evalDelayed && dependency._target._notificationIsPending) || dependency._target.hasChanged(dependency._version)) {
2530                                return true;
2531                            }
2532                        }
2533                    }
2534                },
2535                markDirty: function () {
2536                    // Process "dirty" events if we can handle delayed notifications
2537                    if (this._evalDelayed && !this[computedState].isBeingEvaluated) {
2538                        this._evalDelayed(false /*isChange*/);
2539                    }
2540                },
2541                isActive: function () {
2542                    var state = this[computedState];
2543                    return state.isDirty || state.dependenciesCount > 0;
2544                },
2545                respondToChange: function () {
2546                    // Ignore "change" events if we've already scheduled a delayed notification
2547                    if (!this._notificationIsPending) {
2548                        this.evaluatePossiblyAsync();
2549                    } else if (this[computedState].isDirty) {
2550                        this[computedState].isStale = true;
2551                    }
2552                },
2553                subscribeToDependency: function (target) {
2554                    if (target._deferUpdates) {
2555                        var dirtySub = target.subscribe(this.markDirty, this, 'dirty'),
2556                            changeSub = target.subscribe(this.respondToChange, this);
2557                        return {
2558                            _target: target,
2559                            dispose: function () {
2560                                dirtySub.dispose();
2561                                changeSub.dispose();
2562                            }
2563                        };
2564                    } else {
2565                        return target.subscribe(this.evaluatePossiblyAsync, this);
2566                    }
2567                },
2568                evaluatePossiblyAsync: function () {
2569                    var computedObservable = this,
2570                        throttleEvaluationTimeout = computedObservable['throttleEvaluation'];
2571                    if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
2572                        clearTimeout(this[computedState].evaluationTimeoutInstance);
2573                        this[computedState].evaluationTimeoutInstance = ko.utils.setTimeout(function () {
2574                            computedObservable.evaluateImmediate(true /*notifyChange*/);
2575                        }, throttleEvaluationTimeout);
2576                    } else if (computedObservable._evalDelayed) {
2577                        computedObservable._evalDelayed(true /*isChange*/);
2578                    } else {
2579                        computedObservable.evaluateImmediate(true /*notifyChange*/);
2580                    }
2581                },
2582                evaluateImmediate: function (notifyChange) {
2583                    var computedObservable = this,
2584                        state = computedObservable[computedState],
2585                        disposeWhen = state.disposeWhen,
2586                        changed = false;
2587
2588                    if (state.isBeingEvaluated) {
2589                        // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
2590                        // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
2591                        // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
2592                        // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
2593                        return;
2594                    }
2595
2596                    // Do not evaluate (and possibly capture new dependencies) if disposed
2597                    if (state.isDisposed) {
2598                        return;
2599                    }
2600
2601                    if (state.disposeWhenNodeIsRemoved && !ko.utils.domNodeIsAttachedToDocument(state.disposeWhenNodeIsRemoved) || disposeWhen && disposeWhen()) {
2602                        // See comment above about suppressDisposalUntilDisposeWhenReturnsFalse
2603                        if (!state.suppressDisposalUntilDisposeWhenReturnsFalse) {
2604                            computedObservable.dispose();
2605                            return;
2606                        }
2607                    } else {
2608                        // It just did return false, so we can stop suppressing now
2609                        state.suppressDisposalUntilDisposeWhenReturnsFalse = false;
2610                    }
2611
2612                    state.isBeingEvaluated = true;
2613                    try {
2614                        changed = this.evaluateImmediate_CallReadWithDependencyDetection(notifyChange);
2615                    } finally {
2616                        state.isBeingEvaluated = false;
2617                    }
2618
2619                    return changed;
2620                },
2621                evaluateImmediate_CallReadWithDependencyDetection: function (notifyChange) {
2622                    // This function is really just part of the evaluateImmediate logic. You would never call it from anywhere else.
2623                    // Factoring it out into a separate function means it can be independent of the try/catch block in evaluateImmediate,
2624                    // which contributes to saving about 40% off the CPU overhead of computed evaluation (on V8 at least).
2625
2626                    var computedObservable = this,
2627                        state = computedObservable[computedState],
2628                        changed = false;
2629
2630                    // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
2631                    // Then, during evaluation, we cross off any that are in fact still being used.
2632                    var isInitial = state.pure ? undefined : !state.dependenciesCount,   // If we're evaluating when there are no previous dependencies, it must be the first time
2633                        dependencyDetectionContext = {
2634                            computedObservable: computedObservable,
2635                            disposalCandidates: state.dependencyTracking,
2636                            disposalCount: state.dependenciesCount
2637                        };
2638
2639                    ko.dependencyDetection.begin({
2640                        callbackTarget: dependencyDetectionContext,
2641                        callback: computedBeginDependencyDetectionCallback,
2642                        computed: computedObservable,
2643                        isInitial: isInitial
2644                    });
2645
2646                    state.dependencyTracking = {};
2647                    state.dependenciesCount = 0;
2648
2649                    var newValue = this.evaluateImmediate_CallReadThenEndDependencyDetection(state, dependencyDetectionContext);
2650
2651                    if (!state.dependenciesCount) {
2652                        computedObservable.dispose();
2653                        changed = true; // When evaluation causes a disposal, make sure all dependent computeds get notified so they'll see the new state
2654                    } else {
2655                        changed = computedObservable.isDifferent(state.latestValue, newValue);
2656                    }
2657
2658                    if (changed) {
2659                        if (!state.isSleeping) {
2660                            computedObservable["notifySubscribers"](state.latestValue, "beforeChange");
2661                        } else {
2662                            computedObservable.updateVersion();
2663                        }
2664
2665                        state.latestValue = newValue;
2666                        if (DEBUG) computedObservable._latestValue = newValue;
2667
2668                        computedObservable["notifySubscribers"](state.latestValue, "spectate");
2669
2670                        if (!state.isSleeping && notifyChange) {
2671                            computedObservable["notifySubscribers"](state.latestValue);
2672                        }
2673                        if (computedObservable._recordUpdate) {
2674                            computedObservable._recordUpdate();
2675                        }
2676                    }
2677
2678                    if (isInitial) {
2679                        computedObservable["notifySubscribers"](state.latestValue, "awake");
2680                    }
2681
2682                    return changed;
2683                },
2684                evaluateImmediate_CallReadThenEndDependencyDetection: function (state, dependencyDetectionContext) {
2685                    // This function is really part of the evaluateImmediate_CallReadWithDependencyDetection logic.
2686                    // You'd never call it from anywhere else. Factoring it out means that evaluateImmediate_CallReadWithDependencyDetection
2687                    // can be independent of try/finally blocks, which contributes to saving about 40% off the CPU
2688                    // overhead of computed evaluation (on V8 at least).
2689
2690                    try {
2691                        var readFunction = state.readFunction;
2692                        return state.evaluatorFunctionTarget ? readFunction.call(state.evaluatorFunctionTarget) : readFunction();
2693                    } finally {
2694                        ko.dependencyDetection.end();
2695
2696                        // For each subscription no longer being used, remove it from the active subscriptions list and dispose it
2697                        if (dependencyDetectionContext.disposalCount && !state.isSleeping) {
2698                            ko.utils.objectForEach(dependencyDetectionContext.disposalCandidates, computedDisposeDependencyCallback);
2699                        }
2700
2701                        state.isStale = state.isDirty = false;
2702                    }
2703                },
2704                peek: function (evaluate) {
2705                    // By default, peek won't re-evaluate, except while the computed is sleeping or to get the initial value when "deferEvaluation" is set.
2706                    // Pass in true to evaluate if needed.
2707                    var state = this[computedState];
2708                    if ((state.isDirty && (evaluate || !state.dependenciesCount)) || (state.isSleeping && this.haveDependenciesChanged())) {
2709                        this.evaluateImmediate();
2710                    }
2711                    return state.latestValue;
2712                },
2713                limit: function (limitFunction) {
2714                    // Override the limit function with one that delays evaluation as well
2715                    ko.subscribable['fn'].limit.call(this, limitFunction);
2716                    this._evalIfChanged = function () {
2717                        if (!this[computedState].isSleeping) {
2718                            if (this[computedState].isStale) {
2719                                this.evaluateImmediate();
2720                            } else {
2721                                this[computedState].isDirty = false;
2722                            }
2723                        }
2724                        return this[computedState].latestValue;
2725                    };
2726                    this._evalDelayed = function (isChange) {
2727                        this._limitBeforeChange(this[computedState].latestValue);
2728
2729                        // Mark as dirty
2730                        this[computedState].isDirty = true;
2731                        if (isChange) {
2732                            this[computedState].isStale = true;
2733                        }
2734
2735                        // Pass the observable to the "limit" code, which will evaluate it when
2736                        // it's time to do the notification.
2737                        this._limitChange(this, !isChange /* isDirty */);
2738                    };
2739                },
2740                dispose: function () {
2741                    var state = this[computedState];
2742                    if (!state.isSleeping && state.dependencyTracking) {
2743                        ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
2744                            if (dependency.dispose)
2745                                dependency.dispose();
2746                        });
2747                    }
2748                    if (state.disposeWhenNodeIsRemoved && state.domNodeDisposalCallback) {
2749                        ko.utils.domNodeDisposal.removeDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback);
2750                    }
2751                    state.dependencyTracking = undefined;
2752                    state.dependenciesCount = 0;
2753                    state.isDisposed = true;
2754                    state.isStale = false;
2755                    state.isDirty = false;
2756                    state.isSleeping = false;
2757                    state.disposeWhenNodeIsRemoved = undefined;
2758                    state.disposeWhen = undefined;
2759                    state.readFunction = undefined;
2760                    if (!this.hasWriteFunction) {
2761                        state.evaluatorFunctionTarget = undefined;
2762                    }
2763                }
2764            };
2765
2766            var pureComputedOverrides = {
2767                beforeSubscriptionAdd: function (event) {
2768                    // If asleep, wake up the computed by subscribing to any dependencies.
2769                    var computedObservable = this,
2770                        state = computedObservable[computedState];
2771                    if (!state.isDisposed && state.isSleeping && event == 'change') {
2772                        state.isSleeping = false;
2773                        if (state.isStale || computedObservable.haveDependenciesChanged()) {
2774                            state.dependencyTracking = null;
2775                            state.dependenciesCount = 0;
2776                            if (computedObservable.evaluateImmediate()) {
2777                                computedObservable.updateVersion();
2778                            }
2779                        } else {
2780                            // First put the dependencies in order
2781                            var dependenciesOrder = [];
2782                            ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
2783                                dependenciesOrder[dependency._order] = id;
2784                            });
2785                            // Next, subscribe to each one
2786                            ko.utils.arrayForEach(dependenciesOrder, function (id, order) {
2787                                var dependency = state.dependencyTracking[id],
2788                                    subscription = computedObservable.subscribeToDependency(dependency._target);
2789                                subscription._order = order;
2790                                subscription._version = dependency._version;
2791                                state.dependencyTracking[id] = subscription;
2792                            });
2793                            // Waking dependencies may have triggered effects
2794                            if (computedObservable.haveDependenciesChanged()) {
2795                                if (computedObservable.evaluateImmediate()) {
2796                                    computedObservable.updateVersion();
2797                                }
2798                            }
2799                        }
2800
2801                        if (!state.isDisposed) {     // test since evaluating could trigger disposal
2802                            computedObservable["notifySubscribers"](state.latestValue, "awake");
2803                        }
2804                    }
2805                },
2806                afterSubscriptionRemove: function (event) {
2807                    var state = this[computedState];
2808                    if (!state.isDisposed && event == 'change' && !this.hasSubscriptionsForEvent('change')) {
2809                        ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
2810                            if (dependency.dispose) {
2811                                state.dependencyTracking[id] = {
2812                                    _target: dependency._target,
2813                                    _order: dependency._order,
2814                                    _version: dependency._version
2815                                };
2816                                dependency.dispose();
2817                            }
2818                        });
2819                        state.isSleeping = true;
2820                        this["notifySubscribers"](undefined, "asleep");
2821                    }
2822                },
2823                getVersion: function () {
2824                    // Because a pure computed is not automatically updated while it is sleeping, we can't
2825                    // simply return the version number. Instead, we check if any of the dependencies have
2826                    // changed and conditionally re-evaluate the computed observable.
2827                    var state = this[computedState];
2828                    if (state.isSleeping && (state.isStale || this.haveDependenciesChanged())) {
2829                        this.evaluateImmediate();
2830                    }
2831                    return ko.subscribable['fn'].getVersion.call(this);
2832                }
2833            };
2834
2835            var deferEvaluationOverrides = {
2836                beforeSubscriptionAdd: function (event) {
2837                    // This will force a computed with deferEvaluation to evaluate when the first subscription is registered.
2838                    if (event == 'change' || event == 'beforeChange') {
2839                        this.peek();
2840                    }
2841                }
2842            };
2843
2844            // Note that for browsers that don't support proto assignment, the
2845            // inheritance chain is created manually in the ko.computed constructor
2846            if (ko.utils.canSetPrototype) {
2847                ko.utils.setPrototypeOf(computedFn, ko.subscribable['fn']);
2848            }
2849
2850            // Set the proto values for ko.computed
2851            var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
2852            computedFn[protoProp] = ko.computed;
2853
2854            ko.isComputed = function (instance) {
2855                return (typeof instance == 'function' && instance[protoProp] === computedFn[protoProp]);
2856            };
2857
2858            ko.isPureComputed = function (instance) {
2859                return ko.isComputed(instance) && instance[computedState] && instance[computedState].pure;
2860            };
2861
2862            ko.exportSymbol('computed', ko.computed);
2863            ko.exportSymbol('dependentObservable', ko.computed);    // export ko.dependentObservable for backwards compatibility (1.x)
2864            ko.exportSymbol('isComputed', ko.isComputed);
2865            ko.exportSymbol('isPureComputed', ko.isPureComputed);
2866            ko.exportSymbol('computed.fn', computedFn);
2867            ko.exportProperty(computedFn, 'peek', computedFn.peek);
2868            ko.exportProperty(computedFn, 'dispose', computedFn.dispose);
2869            ko.exportProperty(computedFn, 'isActive', computedFn.isActive);
2870            ko.exportProperty(computedFn, 'getDependenciesCount', computedFn.getDependenciesCount);
2871            ko.exportProperty(computedFn, 'getDependencies', computedFn.getDependencies);
2872
2873            ko.pureComputed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget) {
2874                if (typeof evaluatorFunctionOrOptions === 'function') {
2875                    return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget, { 'pure': true });
2876                } else {
2877                    evaluatorFunctionOrOptions = ko.utils.extend({}, evaluatorFunctionOrOptions);   // make a copy of the parameter object
2878                    evaluatorFunctionOrOptions['pure'] = true;
2879                    return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget);
2880                }
2881            }
2882            ko.exportSymbol('pureComputed', ko.pureComputed);
2883
2884            (function () {
2885                var maxNestedObservableDepth = 10; // Escape the (unlikely) pathological case where an observable's current value is itself (or similar reference cycle)
2886
2887                ko.toJS = function (rootObject) {
2888                    if (arguments.length == 0)
2889                        throw new Error("When calling ko.toJS, pass the object you want to convert.");
2890
2891                    // We just unwrap everything at every level in the object graph
2892                    return mapJsObjectGraph(rootObject, function (valueToMap) {
2893                        // Loop because an observable's value might in turn be another observable wrapper
2894                        for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
2895                            valueToMap = valueToMap();
2896                        return valueToMap;
2897                    });
2898                };
2899
2900                ko.toJSON = function (rootObject, replacer, space) {     // replacer and space are optional
2901                    var plainJavaScriptObject = ko.toJS(rootObject);
2902                    return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
2903                };
2904
2905                function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
2906                    visitedObjects = visitedObjects || new objectLookup();
2907
2908                    rootObject = mapInputCallback(rootObject);
2909                    var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof RegExp)) && (!(rootObject instanceof Date)) && (!(rootObject instanceof String)) && (!(rootObject instanceof Number)) && (!(rootObject instanceof Boolean));
2910                    if (!canHaveProperties)
2911                        return rootObject;
2912
2913                    var outputProperties = rootObject instanceof Array ? [] : {};
2914                    visitedObjects.save(rootObject, outputProperties);
2915
2916                    visitPropertiesOrArrayEntries(rootObject, function (indexer) {
2917                        var propertyValue = mapInputCallback(rootObject[indexer]);
2918
2919                        switch (typeof propertyValue) {
2920                            case "boolean":
2921                            case "number":
2922                            case "string":
2923                            case "function":
2924                                outputProperties[indexer] = propertyValue;
2925                                break;
2926                            case "object":
2927                            case "undefined":
2928                                var previouslyMappedValue = visitedObjects.get(propertyValue);
2929                                outputProperties[indexer] = (previouslyMappedValue !== undefined)
2930                                    ? previouslyMappedValue
2931                                    : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
2932                                break;
2933                        }
2934                    });
2935
2936                    return outputProperties;
2937                }
2938
2939                function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
2940                    if (rootObject instanceof Array) {
2941                        for (var i = 0; i < rootObject.length; i++)
2942                            visitorCallback(i);
2943
2944                        // For arrays, also respect toJSON property for custom mappings (fixes #278)
2945                        if (typeof rootObject['toJSON'] == 'function')
2946                            visitorCallback('toJSON');
2947                    } else {
2948                        for (var propertyName in rootObject) {
2949                            visitorCallback(propertyName);
2950                        }
2951                    }
2952                };
2953
2954                function objectLookup() {
2955                    this.keys = [];
2956                    this.values = [];
2957                };
2958
2959                objectLookup.prototype = {
2960                    constructor: objectLookup,
2961                    save: function (key, value) {
2962                        var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
2963                        if (existingIndex >= 0)
2964                            this.values[existingIndex] = value;
2965                        else {
2966                            this.keys.push(key);
2967                            this.values.push(value);
2968                        }
2969                    },
2970                    get: function (key) {
2971                        var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
2972                        return (existingIndex >= 0) ? this.values[existingIndex] : undefined;
2973                    }
2974                };
2975            })();
2976
2977            ko.exportSymbol('toJS', ko.toJS);
2978            ko.exportSymbol('toJSON', ko.toJSON);
2979            ko.when = function (predicate, callback, context) {
2980                function kowhen(resolve) {
2981                    var observable = ko.pureComputed(predicate, context).extend({ notify: 'always' });
2982                    var subscription = observable.subscribe(function (value) {
2983                        if (value) {
2984                            subscription.dispose();
2985                            resolve(value);
2986                        }
2987                    });
2988                    // In case the initial value is true, process it right away
2989                    observable['notifySubscribers'](observable.peek());
2990
2991                    return subscription;
2992                }
2993                if (typeof Promise === "function" && !callback) {
2994                    return new Promise(kowhen);
2995                } else {
2996                    return kowhen(callback.bind(context));
2997                }
2998            };
2999
3000            ko.exportSymbol('when', ko.when);
3001            (function () {
3002                var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
3003
3004                // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
3005                // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
3006                // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
3007                ko.selectExtensions = {
3008                    readValue: function (element) {
3009                        switch (ko.utils.tagNameLower(element)) {
3010                            case 'option':
3011                                if (element[hasDomDataExpandoProperty] === true)
3012                                    return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
3013                                return ko.utils.ieVersion <= 7
3014                                    ? (element.getAttributeNode('value') && element.getAttributeNode('value').specified ? element.value : element.text)
3015                                    : element.value;
3016                            case 'select':
3017                                return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
3018                            default:
3019                                return element.value;
3020                        }
3021                    },
3022
3023                    writeValue: function (element, value, allowUnset) {
3024                        switch (ko.utils.tagNameLower(element)) {
3025                            case 'option':
3026                                if (typeof value === "string") {
3027                                    ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
3028                                    if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
3029                                        delete element[hasDomDataExpandoProperty];
3030                                    }
3031                                    element.value = value;
3032                                }
3033                                else {
3034                                    // Store arbitrary object using DomData
3035                                    ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
3036                                    element[hasDomDataExpandoProperty] = true;
3037
3038                                    // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
3039                                    element.value = typeof value === "number" ? value : "";
3040                                }
3041                                break;
3042                            case 'select':
3043                                if (value === "" || value === null)       // A blank string or null value will select the caption
3044                                    value = undefined;
3045                                var selection = -1;
3046                                for (var i = 0, n = element.options.length, optionValue; i < n; ++i) {
3047                                    optionValue = ko.selectExtensions.readValue(element.options[i]);
3048                                    // Include special check to handle selecting a caption with a blank string value
3049                                    if (optionValue == value || (optionValue === "" && value === undefined)) {
3050                                        selection = i;
3051                                        break;
3052                                    }
3053                                }
3054                                if (allowUnset || selection >= 0 || (value === undefined && element.size > 1)) {
3055                                    element.selectedIndex = selection;
3056                                    if (ko.utils.ieVersion === 6) {
3057                                        // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
3058                                        // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
3059                                        // to apply the value as well.
3060                                        ko.utils.setTimeout(function () {
3061                                            element.selectedIndex = selection;
3062                                        }, 0);
3063                                    }
3064                                }
3065                                break;
3066                            default:
3067                                if ((value === null) || (value === undefined))
3068                                    value = "";
3069                                element.value = value;
3070                                break;
3071                        }
3072                    }
3073                };
3074            })();
3075
3076            ko.exportSymbol('selectExtensions', ko.selectExtensions);
3077            ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
3078            ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);
3079            ko.expressionRewriting = (function () {
3080                var javaScriptReservedWords = ["true", "false", "null", "undefined"];
3081
3082                // Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor
3083                // This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).
3084                // This also will not properly handle nested brackets (e.g., obj1[obj2['prop']]; see #911).
3085                var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;
3086
3087                function getWriteableValue(expression) {
3088                    if (ko.utils.arrayIndexOf(javaScriptReservedWords, expression) >= 0)
3089                        return false;
3090                    var match = expression.match(javaScriptAssignmentTarget);
3091                    return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
3092                }
3093
3094                // The following regular expressions will be used to split an object-literal string into tokens
3095
3096                var specials = ',"\'`{}()/:[\\]',    // These characters have special meaning to the parser and must not appear in the middle of a token, except as part of a string.
3097                    // Create the actual regular expression by or-ing the following regex strings. The order is important.
3098                    bindingToken = RegExp([
3099                        // These match strings, either with double quotes, single quotes, or backticks
3100                        '"(?:\\\\.|[^"])*"',
3101                        "'(?:\\\\.|[^'])*'",
3102                        "`(?:\\\\.|[^`])*`",
3103                        // Match C style comments
3104                        "/\\*(?:[^*]|\\*+[^*/])*\\*+/",
3105                        // Match C++ style comments
3106                        "//.*\n",
3107                        // Match a regular expression (text enclosed by slashes), but will also match sets of divisions
3108                        // as a regular expression (this is handled by the parsing loop below).
3109                        '/(?:\\\\.|[^/])+/\w*',
3110                        // Match text (at least two characters) that does not contain any of the above special characters,
3111                        // although some of the special characters are allowed to start it (all but the colon and comma).
3112                        // The text can contain spaces, but leading or trailing spaces are skipped.
3113                        '[^\\s:,/][^' + specials + ']*[^\\s' + specials + ']',
3114                        // Match any non-space character not matched already. This will match colons and commas, since they're
3115                        // not matched by "everyThingElse", but will also match any other single character that wasn't already
3116                        // matched (for example: in "a: 1, b: 2", each of the non-space characters will be matched by oneNotSpace).
3117                        '[^\\s]'
3118                    ].join('|'), 'g'),
3119
3120                    // Match end of previous token to determine whether a slash is a division or regex.
3121                    divisionLookBehind = /[\])"'A-Za-z0-9_$]+$/,
3122                    keywordRegexLookBehind = { 'in': 1, 'return': 1, 'typeof': 1 };
3123
3124                function parseObjectLiteral(objectLiteralString) {
3125                    // Trim leading and trailing spaces from the string
3126                    var str = ko.utils.stringTrim(objectLiteralString);
3127
3128                    // Trim braces '{' surrounding the whole object literal
3129                    if (str.charCodeAt(0) === 123) str = str.slice(1, -1);
3130
3131                    // Add a newline to correctly match a C++ style comment at the end of the string and
3132                    // add a comma so that we don't need a separate code block to deal with the last item
3133                    str += "\n,";
3134
3135                    // Split into tokens
3136                    var result = [], toks = str.match(bindingToken), key, values = [], depth = 0;
3137
3138                    if (toks.length > 1) {
3139                        for (var i = 0, tok; tok = toks[i]; ++i) {
3140                            var c = tok.charCodeAt(0);
3141                            // A comma signals the end of a key/value pair if depth is zero
3142                            if (c === 44) { // ","
3143                                if (depth <= 0) {
3144                                    result.push((key && values.length) ? { key: key, value: values.join('') } : { 'unknown': key || values.join('') });
3145                                    key = depth = 0;
3146                                    values = [];
3147                                    continue;
3148                                }
3149                                // Simply skip the colon that separates the name and value
3150                            } else if (c === 58) { // ":"
3151                                if (!depth && !key && values.length === 1) {
3152                                    key = values.pop();
3153                                    continue;
3154                                }
3155                                // Comments: skip them
3156                            } else if (c === 47 && tok.length > 1 && (tok.charCodeAt(1) === 47 || tok.charCodeAt(1) === 42)) {  // "//" or "/*"
3157                                continue;
3158                                // A set of slashes is initially matched as a regular expression, but could be division
3159                            } else if (c === 47 && i && tok.length > 1) {  // "/"
3160                                // Look at the end of the previous token to determine if the slash is actually division
3161                                var match = toks[i - 1].match(divisionLookBehind);
3162                                if (match && !keywordRegexLookBehind[match[0]]) {
3163                                    // The slash is actually a division punctuator; re-parse the remainder of the string (not including the slash)
3164                                    str = str.substr(str.indexOf(tok) + 1);
3165                                    toks = str.match(bindingToken);
3166                                    i = -1;
3167                                    // Continue with just the slash
3168                                    tok = '/';
3169                                }
3170                                // Increment depth for parentheses, braces, and brackets so that interior commas are ignored
3171                            } else if (c === 40 || c === 123 || c === 91) { // '(', '{', '['
3172                                ++depth;
3173                            } else if (c === 41 || c === 125 || c === 93) { // ')', '}', ']'
3174                                --depth;
3175                                // The key will be the first token; if it's a string, trim the quotes
3176                            } else if (!key && !values.length && (c === 34 || c === 39)) { // '"', "'"
3177                                tok = tok.slice(1, -1);
3178                            }
3179                            values.push(tok);
3180                        }
3181                        if (depth > 0) {
3182                            throw Error("Unbalanced parentheses, braces, or brackets");
3183                        }
3184                    }
3185                    return result;
3186                }
3187
3188                // Two-way bindings include a write function that allow the handler to update the value even if it's not an observable.
3189                var twoWayBindings = {};
3190
3191                function preProcessBindings(bindingsStringOrKeyValueArray, bindingOptions) {
3192                    bindingOptions = bindingOptions || {};
3193
3194                    function processKeyValue(key, val) {
3195                        var writableVal;
3196                        function callPreprocessHook(obj) {
3197                            return (obj && obj['preprocess']) ? (val = obj['preprocess'](val, key, processKeyValue)) : true;
3198                        }
3199                        if (!bindingParams) {
3200                            if (!callPreprocessHook(ko['getBindingHandler'](key)))
3201                                return;
3202
3203                            if (twoWayBindings[key] && (writableVal = getWriteableValue(val))) {
3204                                // For two-way bindings, provide a write method in case the value
3205                                // isn't a writable observable.
3206                                var writeKey = typeof twoWayBindings[key] == 'string' ? twoWayBindings[key] : key;
3207                                propertyAccessorResultStrings.push("'" + writeKey + "':function(_z){" + writableVal + "=_z}");
3208                            }
3209                        }
3210                        // Values are wrapped in a function so that each value can be accessed independently
3211                        if (makeValueAccessors) {
3212                            val = 'function(){return ' + val + ' }';
3213                        }
3214                        resultStrings.push("'" + key + "':" + val);
3215                    }
3216
3217                    var resultStrings = [],
3218                        propertyAccessorResultStrings = [],
3219                        makeValueAccessors = bindingOptions['valueAccessors'],
3220                        bindingParams = bindingOptions['bindingParams'],
3221                        keyValueArray = typeof bindingsStringOrKeyValueArray === "string" ?
3222                            parseObjectLiteral(bindingsStringOrKeyValueArray) : bindingsStringOrKeyValueArray;
3223
3224                    ko.utils.arrayForEach(keyValueArray, function (keyValue) {
3225                        processKeyValue(keyValue.key || keyValue['unknown'], keyValue.value);
3226                    });
3227
3228                    if (propertyAccessorResultStrings.length)
3229                        processKeyValue('_ko_property_writers', "{" + propertyAccessorResultStrings.join(",") + " }");
3230
3231                    return resultStrings.join(",");
3232                }
3233
3234                return {
3235                    bindingRewriteValidators: [],
3236
3237                    twoWayBindings: twoWayBindings,
3238
3239                    parseObjectLiteral: parseObjectLiteral,
3240
3241                    preProcessBindings: preProcessBindings,
3242
3243                    keyValueArrayContainsKey: function (keyValueArray, key) {
3244                        for (var i = 0; i < keyValueArray.length; i++)
3245                            if (keyValueArray[i]['key'] == key)
3246                                return true;
3247                        return false;
3248                    },
3249
3250                    // Internal, private KO utility for updating model properties from within bindings
3251                    // property:            If the property being updated is (or might be) an observable, pass it here
3252                    //                      If it turns out to be a writable observable, it will be written to directly
3253                    // allBindings:         An object with a get method to retrieve bindings in the current execution context.
3254                    //                      This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
3255                    // key:                 The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
3256                    // value:               The value to be written
3257                    // checkIfDifferent:    If true, and if the property being written is a writable observable, the value will only be written if
3258                    //                      it is !== existing value on that writable observable
3259                    writeValueToProperty: function (property, allBindings, key, value, checkIfDifferent) {
3260                        if (!property || !ko.isObservable(property)) {
3261                            var propWriters = allBindings.get('_ko_property_writers');
3262                            if (propWriters && propWriters[key])
3263                                propWriters[key](value);
3264                        } else if (ko.isWriteableObservable(property) && (!checkIfDifferent || property.peek() !== value)) {
3265                            property(value);
3266                        }
3267                    }
3268                };
3269            })();
3270
3271            ko.exportSymbol('expressionRewriting', ko.expressionRewriting);
3272            ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);
3273            ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);
3274            ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);
3275
3276            // Making bindings explicitly declare themselves as "two way" isn't ideal in the long term (it would be better if
3277            // all bindings could use an official 'property writer' API without needing to declare that they might). However,
3278            // since this is not, and has never been, a public API (_ko_property_writers was never documented), it's acceptable
3279            // as an internal implementation detail in the short term.
3280            // For those developers who rely on _ko_property_writers in their custom bindings, we expose _twoWayBindings as an
3281            // undocumented feature that makes it relatively easy to upgrade to KO 3.0. However, this is still not an official
3282            // public API, and we reserve the right to remove it at any time if we create a real public property writers API.
3283            ko.exportSymbol('expressionRewriting._twoWayBindings', ko.expressionRewriting.twoWayBindings);
3284
3285            // For backward compatibility, define the following aliases. (Previously, these function names were misleading because
3286            // they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)
3287            ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);
3288            ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);
3289            (function () {
3290                // "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
3291                // may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
3292                // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
3293                // of that virtual hierarchy
3294                //
3295                // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
3296                // without having to scatter special cases all over the binding and templating code.
3297
3298                // IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
3299                // but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
3300                // So, use node.text where available, and node.nodeValue elsewhere
3301                var commentNodesHaveTextProperty = document && document.createComment("test").text === "<!--test-->";
3302
3303                var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+([\s\S]+))?\s*-->$/ : /^\s*ko(?:\s+([\s\S]+))?\s*$/;
3304                var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
3305                var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };
3306
3307                function isStartComment(node) {
3308                    return (node.nodeType == 8) && startCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
3309                }
3310
3311                function isEndComment(node) {
3312                    return (node.nodeType == 8) && endCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
3313                }
3314
3315                function isUnmatchedEndComment(node) {
3316                    return isEndComment(node) && !(ko.utils.domData.get(node, matchedEndCommentDataKey));
3317                }
3318
3319                var matchedEndCommentDataKey = "__ko_matchedEndComment__"
3320
3321                function getVirtualChildren(startComment, allowUnbalanced) {
3322                    var currentNode = startComment;
3323                    var depth = 1;
3324                    var children = [];
3325                    while (currentNode = currentNode.nextSibling) {
3326                        if (isEndComment(currentNode)) {
3327                            ko.utils.domData.set(currentNode, matchedEndCommentDataKey, true);
3328                            depth--;
3329                            if (depth === 0)
3330                                return children;
3331                        }
3332
3333                        children.push(currentNode);
3334
3335                        if (isStartComment(currentNode))
3336                            depth++;
3337                    }
3338                    if (!allowUnbalanced)
3339                        throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
3340                    return null;
3341                }
3342
3343                function getMatchingEndComment(startComment, allowUnbalanced) {
3344                    var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
3345                    if (allVirtualChildren) {
3346                        if (allVirtualChildren.length > 0)
3347                            return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
3348                        return startComment.nextSibling;
3349                    } else
3350                        return null; // Must have no matching end comment, and allowUnbalanced is true
3351                }
3352
3353                function getUnbalancedChildTags(node) {
3354                    // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
3355                    //       from <div>OK</div><!-- /ko --><!-- /ko -->,             returns: <!-- /ko --><!-- /ko -->
3356                    var childNode = node.firstChild, captureRemaining = null;
3357                    if (childNode) {
3358                        do {
3359                            if (captureRemaining)                   // We already hit an unbalanced node and are now just scooping up all subsequent nodes
3360                                captureRemaining.push(childNode);
3361                            else if (isStartComment(childNode)) {
3362                                var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
3363                                if (matchingEndComment)             // It's a balanced tag, so skip immediately to the end of this virtual set
3364                                    childNode = matchingEndComment;
3365                                else
3366                                    captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
3367                            } else if (isEndComment(childNode)) {
3368                                captureRemaining = [childNode];     // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
3369                            }
3370                        } while (childNode = childNode.nextSibling);
3371                    }
3372                    return captureRemaining;
3373                }
3374
3375                ko.virtualElements = {
3376                    allowedBindings: {},
3377
3378                    childNodes: function (node) {
3379                        return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
3380                    },
3381
3382                    emptyNode: function (node) {
3383                        if (!isStartComment(node))
3384                            ko.utils.emptyDomNode(node);
3385                        else {
3386                            var virtualChildren = ko.virtualElements.childNodes(node);
3387                            for (var i = 0, j = virtualChildren.length; i < j; i++)
3388                                ko.removeNode(virtualChildren[i]);
3389                        }
3390                    },
3391
3392                    setDomNodeChildren: function (node, childNodes) {
3393                        if (!isStartComment(node))
3394                            ko.utils.setDomNodeChildren(node, childNodes);
3395                        else {
3396                            ko.virtualElements.emptyNode(node);
3397                            var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
3398                            for (var i = 0, j = childNodes.length; i < j; i++)
3399                                endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
3400                        }
3401                    },
3402
3403                    prepend: function (containerNode, nodeToPrepend) {
3404                        var insertBeforeNode;
3405
3406                        if (isStartComment(containerNode)) {
3407                            // Start comments must always have a parent and at least one following sibling (the end comment)
3408                            insertBeforeNode = containerNode.nextSibling;
3409                            containerNode = containerNode.parentNode;
3410                        } else {
3411                            insertBeforeNode = containerNode.firstChild;
3412                        }
3413
3414                        if (!insertBeforeNode) {
3415                            containerNode.appendChild(nodeToPrepend);
3416                        } else if (nodeToPrepend !== insertBeforeNode) {       // IE will sometimes crash if you try to insert a node before itself
3417                            containerNode.insertBefore(nodeToPrepend, insertBeforeNode);
3418                        }
3419                    },
3420
3421                    insertAfter: function (containerNode, nodeToInsert, insertAfterNode) {
3422                        if (!insertAfterNode) {
3423                            ko.virtualElements.prepend(containerNode, nodeToInsert);
3424                        } else {
3425                            // Children of start comments must always have a parent and at least one following sibling (the end comment)
3426                            var insertBeforeNode = insertAfterNode.nextSibling;
3427
3428                            if (isStartComment(containerNode)) {
3429                                containerNode = containerNode.parentNode;
3430                            }
3431
3432                            if (!insertBeforeNode) {
3433                                containerNode.appendChild(nodeToInsert);
3434                            } else if (nodeToInsert !== insertBeforeNode) {       // IE will sometimes crash if you try to insert a node before itself
3435                                containerNode.insertBefore(nodeToInsert, insertBeforeNode);
3436                            }
3437                        }
3438                    },
3439
3440                    firstChild: function (node) {
3441                        if (!isStartComment(node)) {
3442                            if (node.firstChild && isEndComment(node.firstChild)) {
3443                                throw new Error("Found invalid end comment, as the first child of " + node);
3444                            }
3445                            return node.firstChild;
3446                        } else if (!node.nextSibling || isEndComment(node.nextSibling)) {
3447                            return null;
3448                        } else {
3449                            return node.nextSibling;
3450                        }
3451                    },
3452
3453                    nextSibling: function (node) {
3454                        if (isStartComment(node)) {
3455                            node = getMatchingEndComment(node);
3456                        }
3457
3458                        if (node.nextSibling && isEndComment(node.nextSibling)) {
3459                            if (isUnmatchedEndComment(node.nextSibling)) {
3460                                throw Error("Found end comment without a matching opening comment, as child of " + node);
3461                            } else {
3462                                return null;
3463                            }
3464                        } else {
3465                            return node.nextSibling;
3466                        }
3467                    },
3468
3469                    hasBindingValue: isStartComment,
3470
3471                    virtualNodeBindingValue: function (node) {
3472                        var regexMatch = (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
3473                        return regexMatch ? regexMatch[1] : null;
3474                    },
3475
3476                    normaliseVirtualElementDomStructure: function (elementVerified) {
3477                        // Workaround for https://github.com/SteveSanderson/knockout/issues/155
3478                        // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
3479                        // that are direct descendants of <ul> into the preceding <li>)
3480                        if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
3481                            return;
3482
3483                        // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
3484                        // must be intended to appear *after* that child, so move them there.
3485                        var childNode = elementVerified.firstChild;
3486                        if (childNode) {
3487                            do {
3488                                if (childNode.nodeType === 1) {
3489                                    var unbalancedTags = getUnbalancedChildTags(childNode);
3490                                    if (unbalancedTags) {
3491                                        // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
3492                                        var nodeToInsertBefore = childNode.nextSibling;
3493                                        for (var i = 0; i < unbalancedTags.length; i++) {
3494                                            if (nodeToInsertBefore)
3495                                                elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
3496                                            else
3497                                                elementVerified.appendChild(unbalancedTags[i]);
3498                                        }
3499                                    }
3500                                }
3501                            } while (childNode = childNode.nextSibling);
3502                        }
3503                    }
3504                };
3505            })();
3506            ko.exportSymbol('virtualElements', ko.virtualElements);
3507            ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
3508            ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
3509            //ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild);     // firstChild is not minified
3510            ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
3511            //ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling);   // nextSibling is not minified
3512            ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
3513            ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
3514            (function () {
3515                var defaultBindingAttributeName = "data-bind";
3516
3517                ko.bindingProvider = function () {
3518                    this.bindingCache = {};
3519                };
3520
3521                ko.utils.extend(ko.bindingProvider.prototype, {
3522                    'nodeHasBindings': function (node) {
3523                        switch (node.nodeType) {
3524                            case 1: // Element
3525                                return node.getAttribute(defaultBindingAttributeName) != null
3526                                    || ko.components['getComponentNameForNode'](node);
3527                            case 8: // Comment node
3528                                return ko.virtualElements.hasBindingValue(node);
3529                            default: return false;
3530                        }
3531                    },
3532
3533                    'getBindings': function (node, bindingContext) {
3534                        var bindingsString = this['getBindingsString'](node, bindingContext),
3535                            parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
3536                        return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ false);
3537                    },
3538
3539                    'getBindingAccessors': function (node, bindingContext) {
3540                        var bindingsString = this['getBindingsString'](node, bindingContext),
3541                            parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node, { 'valueAccessors': true }) : null;
3542                        return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ true);
3543                    },
3544
3545                    // The following function is only used internally by this default provider.
3546                    // It's not part of the interface definition for a general binding provider.
3547                    'getBindingsString': function (node, bindingContext) {
3548                        switch (node.nodeType) {
3549                            case 1: return node.getAttribute(defaultBindingAttributeName);   // Element
3550                            case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
3551                            default: return null;
3552                        }
3553                    },
3554
3555                    // The following function is only used internally by this default provider.
3556                    // It's not part of the interface definition for a general binding provider.
3557                    'parseBindingsString': function (bindingsString, bindingContext, node, options) {
3558                        try {
3559                            var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache, options);
3560                            return bindingFunction(bindingContext, node);
3561                        } catch (ex) {
3562                            ex.message = "Unable to parse bindings.\nBindings value: " + bindingsString + "\nMessage: " + ex.message;
3563                            throw ex;
3564                        }
3565                    }
3566                });
3567
3568                ko.bindingProvider['instance'] = new ko.bindingProvider();
3569
3570                function createBindingsStringEvaluatorViaCache(bindingsString, cache, options) {
3571                    var cacheKey = bindingsString + (options && options['valueAccessors'] || '');
3572                    return cache[cacheKey]
3573                        || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, options));
3574                }
3575
3576                function createBindingsStringEvaluator(bindingsString, options) {
3577                    // Build the source for a function that evaluates "expression"
3578                    // For each scope variable, add an extra level of "with" nesting
3579                    // Example result: with(sc1) { with(sc0) { return (expression) } }
3580                    var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options),
3581                        functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
3582                    return new Function("$context", "$element", functionBody);
3583                }
3584            })();
3585
3586            ko.exportSymbol('bindingProvider', ko.bindingProvider);
3587            (function () {
3588                // Hide or don't minify context properties, see https://github.com/knockout/knockout/issues/2294
3589                var contextSubscribable = ko.utils.createSymbolOrString('_subscribable');
3590                var contextAncestorBindingInfo = ko.utils.createSymbolOrString('_ancestorBindingInfo');
3591                var contextDataDependency = ko.utils.createSymbolOrString('_dataDependency');
3592
3593                ko.bindingHandlers = {};
3594
3595                // The following element types will not be recursed into during binding.
3596                var bindingDoesNotRecurseIntoElementTypes = {
3597                    // Don't want bindings that operate on text nodes to mutate <script> and <textarea> contents,
3598                    // because it's unexpected and a potential XSS issue.
3599                    // Also bindings should not operate on <template> elements since this breaks in Internet Explorer
3600                    // and because such elements' contents are always intended to be bound in a different context
3601                    // from where they appear in the document.
3602                    'script': true,
3603                    'textarea': true,
3604                    'template': true
3605                };
3606
3607                // Use an overridable method for retrieving binding handlers so that plugins may support dynamically created handlers
3608                ko['getBindingHandler'] = function (bindingKey) {
3609                    return ko.bindingHandlers[bindingKey];
3610                };
3611
3612                var inheritParentVm = {};
3613
3614                // The ko.bindingContext constructor is only called directly to create the root context. For child
3615                // contexts, use bindingContext.createChildContext or bindingContext.extend.
3616                ko.bindingContext = function (dataItemOrAccessor, parentContext, dataItemAlias, extendCallback, options) {
3617
3618                    // The binding context object includes static properties for the current, parent, and root view models.
3619                    // If a view model is actually stored in an observable, the corresponding binding context object, and
3620                    // any child contexts, must be updated when the view model is changed.
3621                    function updateContext() {
3622                        // Most of the time, the context will directly get a view model object, but if a function is given,
3623                        // we call the function to retrieve the view model. If the function accesses any observables or returns
3624                        // an observable, the dependency is tracked, and those observables can later cause the binding
3625                        // context to be updated.
3626                        var dataItemOrObservable = isFunc ? realDataItemOrAccessor() : realDataItemOrAccessor,
3627                            dataItem = ko.utils.unwrapObservable(dataItemOrObservable);
3628
3629                        if (parentContext) {
3630                            // Copy $root and any custom properties from the parent context
3631                            ko.utils.extend(self, parentContext);
3632
3633                            // Copy Symbol properties
3634                            if (contextAncestorBindingInfo in parentContext) {
3635                                self[contextAncestorBindingInfo] = parentContext[contextAncestorBindingInfo];
3636                            }
3637                        } else {
3638                            self['$parents'] = [];
3639                            self['$root'] = dataItem;
3640
3641                            // Export 'ko' in the binding context so it will be available in bindings and templates
3642                            // even if 'ko' isn't exported as a global, such as when using an AMD loader.
3643                            // See https://github.com/SteveSanderson/knockout/issues/490
3644                            self['ko'] = ko;
3645                        }
3646
3647                        self[contextSubscribable] = subscribable;
3648
3649                        if (shouldInheritData) {
3650                            dataItem = self['$data'];
3651                        } else {
3652                            self['$rawData'] = dataItemOrObservable;
3653                            self['$data'] = dataItem;
3654                        }
3655
3656                        if (dataItemAlias)
3657                            self[dataItemAlias] = dataItem;
3658
3659                        // The extendCallback function is provided when creating a child context or extending a context.
3660                        // It handles the specific actions needed to finish setting up the binding context. Actions in this
3661                        // function could also add dependencies to this binding context.
3662                        if (extendCallback)
3663                            extendCallback(self, parentContext, dataItem);
3664
3665                        // When a "parent" context is given and we don't already have a dependency on its context, register a dependency on it.
3666                        // Thus whenever the parent context is updated, this context will also be updated.
3667                        if (parentContext && parentContext[contextSubscribable] && !ko.computedContext.computed().hasAncestorDependency(parentContext[contextSubscribable])) {
3668                            parentContext[contextSubscribable]();
3669                        }
3670
3671                        if (dataDependency) {
3672                            self[contextDataDependency] = dataDependency;
3673                        }
3674
3675                        return self['$data'];
3676                    }
3677
3678                    var self = this,
3679                        shouldInheritData = dataItemOrAccessor === inheritParentVm,
3680                        realDataItemOrAccessor = shouldInheritData ? undefined : dataItemOrAccessor,
3681                        isFunc = typeof (realDataItemOrAccessor) == "function" && !ko.isObservable(realDataItemOrAccessor),
3682                        nodes,
3683                        subscribable,
3684                        dataDependency = options && options['dataDependency'];
3685
3686                    if (options && options['exportDependencies']) {
3687                        // The "exportDependencies" option means that the calling code will track any dependencies and re-create
3688                        // the binding context when they change.
3689                        updateContext();
3690                    } else {
3691                        subscribable = ko.pureComputed(updateContext);
3692                        subscribable.peek();
3693
3694                        // At this point, the binding context has been initialized, and the "subscribable" computed observable is
3695                        // subscribed to any observables that were accessed in the process. If there is nothing to track, the
3696                        // computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in
3697                        // the context object.
3698                        if (subscribable.isActive()) {
3699                            // Always notify because even if the model ($data) hasn't changed, other context properties might have changed
3700                            subscribable['equalityComparer'] = null;
3701                        } else {
3702                            self[contextSubscribable] = undefined;
3703                        }
3704                    }
3705                }
3706
3707                // Extend the binding context hierarchy with a new view model object. If the parent context is watching
3708                // any observables, the new child context will automatically get a dependency on the parent context.
3709                // But this does not mean that the $data value of the child context will also get updated. If the child
3710                // view model also depends on the parent view model, you must provide a function that returns the correct
3711                // view model on each update.
3712                ko.bindingContext.prototype['createChildContext'] = function (dataItemOrAccessor, dataItemAlias, extendCallback, options) {
3713                    if (!options && dataItemAlias && typeof dataItemAlias == "object") {
3714                        options = dataItemAlias;
3715                        dataItemAlias = options['as'];
3716                        extendCallback = options['extend'];
3717                    }
3718
3719                    if (dataItemAlias && options && options['noChildContext']) {
3720                        var isFunc = typeof (dataItemOrAccessor) == "function" && !ko.isObservable(dataItemOrAccessor);
3721                        return new ko.bindingContext(inheritParentVm, this, null, function (self) {
3722                            if (extendCallback)
3723                                extendCallback(self);
3724                            self[dataItemAlias] = isFunc ? dataItemOrAccessor() : dataItemOrAccessor;
3725                        }, options);
3726                    }
3727
3728                    return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, function (self, parentContext) {
3729                        // Extend the context hierarchy by setting the appropriate pointers
3730                        self['$parentContext'] = parentContext;
3731                        self['$parent'] = parentContext['$data'];
3732                        self['$parents'] = (parentContext['$parents'] || []).slice(0);
3733                        self['$parents'].unshift(self['$parent']);
3734                        if (extendCallback)
3735                            extendCallback(self);
3736                    }, options);
3737                };
3738
3739                // Extend the binding context with new custom properties. This doesn't change the context hierarchy.
3740                // Similarly to "child" contexts, provide a function here to make sure that the correct values are set
3741                // when an observable view model is updated.
3742                ko.bindingContext.prototype['extend'] = function (properties, options) {
3743                    return new ko.bindingContext(inheritParentVm, this, null, function (self, parentContext) {
3744                        ko.utils.extend(self, typeof (properties) == "function" ? properties(self) : properties);
3745                    }, options);
3746                };
3747
3748                var boundElementDomDataKey = ko.utils.domData.nextKey();
3749
3750                function asyncContextDispose(node) {
3751                    var bindingInfo = ko.utils.domData.get(node, boundElementDomDataKey),
3752                        asyncContext = bindingInfo && bindingInfo.asyncContext;
3753                    if (asyncContext) {
3754                        bindingInfo.asyncContext = null;
3755                        asyncContext.notifyAncestor();
3756                    }
3757                }
3758                function AsyncCompleteContext(node, bindingInfo, ancestorBindingInfo) {
3759                    this.node = node;
3760                    this.bindingInfo = bindingInfo;
3761                    this.asyncDescendants = [];
3762                    this.childrenComplete = false;
3763
3764                    if (!bindingInfo.asyncContext) {
3765                        ko.utils.domNodeDisposal.addDisposeCallback(node, asyncContextDispose);
3766                    }
3767
3768                    if (ancestorBindingInfo && ancestorBindingInfo.asyncContext) {
3769                        ancestorBindingInfo.asyncContext.asyncDescendants.push(node);
3770                        this.ancestorBindingInfo = ancestorBindingInfo;
3771                    }
3772                }
3773                AsyncCompleteContext.prototype.notifyAncestor = function () {
3774                    if (this.ancestorBindingInfo && this.ancestorBindingInfo.asyncContext) {
3775                        this.ancestorBindingInfo.asyncContext.descendantComplete(this.node);
3776                    }
3777                };
3778                AsyncCompleteContext.prototype.descendantComplete = function (node) {
3779                    ko.utils.arrayRemoveItem(this.asyncDescendants, node);
3780                    if (!this.asyncDescendants.length && this.childrenComplete) {
3781                        this.completeChildren();
3782                    }
3783                };
3784                AsyncCompleteContext.prototype.completeChildren = function () {
3785                    this.childrenComplete = true;
3786                    if (this.bindingInfo.asyncContext && !this.asyncDescendants.length) {
3787                        this.bindingInfo.asyncContext = null;
3788                        ko.utils.domNodeDisposal.removeDisposeCallback(this.node, asyncContextDispose);
3789                        ko.bindingEvent.notify(this.node, ko.bindingEvent.descendantsComplete);
3790                        this.notifyAncestor();
3791                    }
3792                };
3793
3794                ko.bindingEvent = {
3795                    childrenComplete: "childrenComplete",
3796                    descendantsComplete: "descendantsComplete",
3797
3798                    subscribe: function (node, event, callback, context, options) {
3799                        var bindingInfo = ko.utils.domData.getOrSet(node, boundElementDomDataKey, {});
3800                        if (!bindingInfo.eventSubscribable) {
3801                            bindingInfo.eventSubscribable = new ko.subscribable;
3802                        }
3803                        if (options && options['notifyImmediately'] && bindingInfo.notifiedEvents[event]) {
3804                            ko.dependencyDetection.ignore(callback, context, [node]);
3805                        }
3806                        return bindingInfo.eventSubscribable.subscribe(callback, context, event);
3807                    },
3808
3809                    notify: function (node, event) {
3810                        var bindingInfo = ko.utils.domData.get(node, boundElementDomDataKey);
3811                        if (bindingInfo) {
3812                            bindingInfo.notifiedEvents[event] = true;
3813                            if (bindingInfo.eventSubscribable) {
3814                                bindingInfo.eventSubscribable['notifySubscribers'](node, event);
3815                            }
3816                            if (event == ko.bindingEvent.childrenComplete) {
3817                                if (bindingInfo.asyncContext) {
3818                                    bindingInfo.asyncContext.completeChildren();
3819                                } else if (bindingInfo.asyncContext === undefined && bindingInfo.eventSubscribable && bindingInfo.eventSubscribable.hasSubscriptionsForEvent(ko.bindingEvent.descendantsComplete)) {
3820                                    // It's currently an error to register a descendantsComplete handler for a node that was never registered as completing asynchronously.
3821                                    // That's because without the asyncContext, we don't have a way to know that all descendants have completed.
3822                                    throw new Error("descendantsComplete event not supported for bindings on this node");
3823                                }
3824                            }
3825                        }
3826                    },
3827
3828                    startPossiblyAsyncContentBinding: function (node, bindingContext) {
3829                        var bindingInfo = ko.utils.domData.getOrSet(node, boundElementDomDataKey, {});
3830
3831                        if (!bindingInfo.asyncContext) {
3832                            bindingInfo.asyncContext = new AsyncCompleteContext(node, bindingInfo, bindingContext[contextAncestorBindingInfo]);
3833                        }
3834
3835                        // If the provided context was already extended with this node's binding info, just return the extended context
3836                        if (bindingContext[contextAncestorBindingInfo] == bindingInfo) {
3837                            return bindingContext;
3838                        }
3839
3840                        return bindingContext['extend'](function (ctx) {
3841                            ctx[contextAncestorBindingInfo] = bindingInfo;
3842                        });
3843                    }
3844                };
3845
3846                // Returns the valueAccessor function for a binding value
3847                function makeValueAccessor(value) {
3848                    return function () {
3849                        return value;
3850                    };
3851                }
3852
3853                // Returns the value of a valueAccessor function
3854                function evaluateValueAccessor(valueAccessor) {
3855                    return valueAccessor();
3856                }
3857
3858                // Given a function that returns bindings, create and return a new object that contains
3859                // binding value-accessors functions. Each accessor function calls the original function
3860                // so that it always gets the latest value and all dependencies are captured. This is used
3861                // by ko.applyBindingsToNode and getBindingsAndMakeAccessors.
3862                function makeAccessorsFromFunction(callback) {
3863                    return ko.utils.objectMap(ko.dependencyDetection.ignore(callback), function (value, key) {
3864                        return function () {
3865                            return callback()[key];
3866                        };
3867                    });
3868                }
3869
3870                // Given a bindings function or object, create and return a new object that contains
3871                // binding value-accessors functions. This is used by ko.applyBindingsToNode.
3872                function makeBindingAccessors(bindings, context, node) {
3873                    if (typeof bindings === 'function') {
3874                        return makeAccessorsFromFunction(bindings.bind(null, context, node));
3875                    } else {
3876                        return ko.utils.objectMap(bindings, makeValueAccessor);
3877                    }
3878                }
3879
3880                // This function is used if the binding provider doesn't include a getBindingAccessors function.
3881                // It must be called with 'this' set to the provider instance.
3882                function getBindingsAndMakeAccessors(node, context) {
3883                    return makeAccessorsFromFunction(this['getBindings'].bind(this, node, context));
3884                }
3885
3886                function validateThatBindingIsAllowedForVirtualElements(bindingName) {
3887                    var validator = ko.virtualElements.allowedBindings[bindingName];
3888                    if (!validator)
3889                        throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
3890                }
3891
3892                function applyBindingsToDescendantsInternal(bindingContext, elementOrVirtualElement) {
3893                    var nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
3894
3895                    if (nextInQueue) {
3896                        var currentChild,
3897                            provider = ko.bindingProvider['instance'],
3898                            preprocessNode = provider['preprocessNode'];
3899
3900                        // Preprocessing allows a binding provider to mutate a node before bindings are applied to it. For example it's
3901                        // possible to insert new siblings after it, and/or replace the node with a different one. This can be used to
3902                        // implement custom binding syntaxes, such as {{ value }} for string interpolation, or custom element types that
3903                        // trigger insertion of <template> contents at that point in the document.
3904                        if (preprocessNode) {
3905                            while (currentChild = nextInQueue) {
3906                                nextInQueue = ko.virtualElements.nextSibling(currentChild);
3907                                preprocessNode.call(provider, currentChild);
3908                            }
3909                            // Reset nextInQueue for the next loop
3910                            nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
3911                        }
3912
3913                        while (currentChild = nextInQueue) {
3914                            // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
3915                            nextInQueue = ko.virtualElements.nextSibling(currentChild);
3916                            applyBindingsToNodeAndDescendantsInternal(bindingContext, currentChild);
3917                        }
3918                    }
3919                    ko.bindingEvent.notify(elementOrVirtualElement, ko.bindingEvent.childrenComplete);
3920                }
3921
3922                function applyBindingsToNodeAndDescendantsInternal(bindingContext, nodeVerified) {
3923                    var bindingContextForDescendants = bindingContext;
3924
3925                    var isElement = (nodeVerified.nodeType === 1);
3926                    if (isElement) // Workaround IE <= 8 HTML parsing weirdness
3927                        ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);
3928
3929                    // Perf optimisation: Apply bindings only if...
3930                    // (1) We need to store the binding info for the node (all element nodes)
3931                    // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
3932                    var shouldApplyBindings = isElement || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified);
3933                    if (shouldApplyBindings)
3934                        bindingContextForDescendants = applyBindingsToNodeInternal(nodeVerified, null, bindingContext)['bindingContextForDescendants'];
3935
3936                    if (bindingContextForDescendants && !bindingDoesNotRecurseIntoElementTypes[ko.utils.tagNameLower(nodeVerified)]) {
3937                        applyBindingsToDescendantsInternal(bindingContextForDescendants, nodeVerified);
3938                    }
3939                }
3940
3941                function topologicalSortBindings(bindings) {
3942                    // Depth-first sort
3943                    var result = [],                // The list of key/handler pairs that we will return
3944                        bindingsConsidered = {},    // A temporary record of which bindings are already in 'result'
3945                        cyclicDependencyStack = []; // Keeps track of a depth-search so that, if there's a cycle, we know which bindings caused it
3946                    ko.utils.objectForEach(bindings, function pushBinding(bindingKey) {
3947                        if (!bindingsConsidered[bindingKey]) {
3948                            var binding = ko['getBindingHandler'](bindingKey);
3949                            if (binding) {
3950                                // First add dependencies (if any) of the current binding
3951                                if (binding['after']) {
3952                                    cyclicDependencyStack.push(bindingKey);
3953                                    ko.utils.arrayForEach(binding['after'], function (bindingDependencyKey) {
3954                                        if (bindings[bindingDependencyKey]) {
3955                                            if (ko.utils.arrayIndexOf(cyclicDependencyStack, bindingDependencyKey) !== -1) {
3956                                                throw Error("Cannot combine the following bindings, because they have a cyclic dependency: " + cyclicDependencyStack.join(", "));
3957                                            } else {
3958                                                pushBinding(bindingDependencyKey);
3959                                            }
3960                                        }
3961                                    });
3962                                    cyclicDependencyStack.length--;
3963                                }
3964                                // Next add the current binding
3965                                result.push({ key: bindingKey, handler: binding });
3966                            }
3967                            bindingsConsidered[bindingKey] = true;
3968                        }
3969                    });
3970
3971                    return result;
3972                }
3973
3974                function applyBindingsToNodeInternal(node, sourceBindings, bindingContext) {
3975                    var bindingInfo = ko.utils.domData.getOrSet(node, boundElementDomDataKey, {});
3976
3977                    // Prevent multiple applyBindings calls for the same node, except when a binding value is specified
3978                    var alreadyBound = bindingInfo.alreadyBound;
3979                    if (!sourceBindings) {
3980                        if (alreadyBound) {
3981                            throw Error("You cannot apply bindings multiple times to the same element.");
3982                        }
3983                        bindingInfo.alreadyBound = true;
3984                    }
3985                    if (!alreadyBound) {
3986                        bindingInfo.context = bindingContext;
3987                    }
3988                    if (!bindingInfo.notifiedEvents) {
3989                        bindingInfo.notifiedEvents = {};
3990                    }
3991
3992                    // Use bindings if given, otherwise fall back on asking the bindings provider to give us some bindings
3993                    var bindings;
3994                    if (sourceBindings && typeof sourceBindings !== 'function') {
3995                        bindings = sourceBindings;
3996                    } else {
3997                        var provider = ko.bindingProvider['instance'],
3998                            getBindings = provider['getBindingAccessors'] || getBindingsAndMakeAccessors;
3999
4000                        // Get the binding from the provider within a computed observable so that we can update the bindings whenever
4001                        // the binding context is updated or if the binding provider accesses observables.
4002                        var bindingsUpdater = ko.dependentObservable(
4003                            function () {
4004                                bindings = sourceBindings ? sourceBindings(bindingContext, node) : getBindings.call(provider, node, bindingContext);
4005                                // Register a dependency on the binding context to support observable view models.
4006                                if (bindings) {
4007                                    if (bindingContext[contextSubscribable]) {
4008                                        bindingContext[contextSubscribable]();
4009                                    }
4010                                    if (bindingContext[contextDataDependency]) {
4011                                        bindingContext[contextDataDependency]();
4012                                    }
4013                                }
4014                                return bindings;
4015                            },
4016                            null, { disposeWhenNodeIsRemoved: node }
4017                        );
4018
4019                        if (!bindings || !bindingsUpdater.isActive())
4020                            bindingsUpdater = null;
4021                    }
4022
4023                    var contextToExtend = bindingContext;
4024                    var bindingHandlerThatControlsDescendantBindings;
4025                    if (bindings) {
4026                        // Return the value accessor for a given binding. When bindings are static (won't be updated because of a binding
4027                        // context update), just return the value accessor from the binding. Otherwise, return a function that always gets
4028                        // the latest binding value and registers a dependency on the binding updater.
4029                        var getValueAccessor = bindingsUpdater
4030                            ? function (bindingKey) {
4031                                return function () {
4032                                    return evaluateValueAccessor(bindingsUpdater()[bindingKey]);
4033                                };
4034                            } : function (bindingKey) {
4035                                return bindings[bindingKey];
4036                            };
4037
4038                        // Use of allBindings as a function is maintained for backwards compatibility, but its use is deprecated
4039                        function allBindings() {
4040                            return ko.utils.objectMap(bindingsUpdater ? bindingsUpdater() : bindings, evaluateValueAccessor);
4041                        }
4042                        // The following is the 3.x allBindings API
4043                        allBindings['get'] = function (key) {
4044                            return bindings[key] && evaluateValueAccessor(getValueAccessor(key));
4045                        };
4046                        allBindings['has'] = function (key) {
4047                            return key in bindings;
4048                        };
4049
4050                        if (ko.bindingEvent.childrenComplete in bindings) {
4051                            ko.bindingEvent.subscribe(node, ko.bindingEvent.childrenComplete, function () {
4052                                var callback = evaluateValueAccessor(bindings[ko.bindingEvent.childrenComplete]);
4053                                if (callback) {
4054                                    var nodes = ko.virtualElements.childNodes(node);
4055                                    if (nodes.length) {
4056                                        callback(nodes, ko.dataFor(nodes[0]));
4057                                    }
4058                                }
4059                            });
4060                        }
4061
4062                        if (ko.bindingEvent.descendantsComplete in bindings) {
4063                            contextToExtend = ko.bindingEvent.startPossiblyAsyncContentBinding(node, bindingContext);
4064                            ko.bindingEvent.subscribe(node, ko.bindingEvent.descendantsComplete, function () {
4065                                var callback = evaluateValueAccessor(bindings[ko.bindingEvent.descendantsComplete]);
4066                                if (callback && ko.virtualElements.firstChild(node)) {
4067                                    callback(node);
4068                                }
4069                            });
4070                        }
4071
4072                        // First put the bindings into the right order
4073                        var orderedBindings = topologicalSortBindings(bindings);
4074
4075                        // Go through the sorted bindings, calling init and update for each
4076                        ko.utils.arrayForEach(orderedBindings, function (bindingKeyAndHandler) {
4077                            // Note that topologicalSortBindings has already filtered out any nonexistent binding handlers,
4078                            // so bindingKeyAndHandler.handler will always be nonnull.
4079                            var handlerInitFn = bindingKeyAndHandler.handler["init"],
4080                                handlerUpdateFn = bindingKeyAndHandler.handler["update"],
4081                                bindingKey = bindingKeyAndHandler.key;
4082
4083                            if (node.nodeType === 8) {
4084                                validateThatBindingIsAllowedForVirtualElements(bindingKey);
4085                            }
4086
4087                            try {
4088                                // Run init, ignoring any dependencies
4089                                if (typeof handlerInitFn == "function") {
4090                                    ko.dependencyDetection.ignore(function () {
4091                                        var initResult = handlerInitFn(node, getValueAccessor(bindingKey), allBindings, contextToExtend['$data'], contextToExtend);
4092
4093                                        // If this binding handler claims to control descendant bindings, make a note of this
4094                                        if (initResult && initResult['controlsDescendantBindings']) {
4095                                            if (bindingHandlerThatControlsDescendantBindings !== undefined)
4096                                                throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
4097                                            bindingHandlerThatControlsDescendantBindings = bindingKey;
4098                                        }
4099                                    });
4100                                }
4101
4102                                // Run update in its own computed wrapper
4103                                if (typeof handlerUpdateFn == "function") {
4104                                    ko.dependentObservable(
4105                                        function () {
4106                                            handlerUpdateFn(node, getValueAccessor(bindingKey), allBindings, contextToExtend['$data'], contextToExtend);
4107                                        },
4108                                        null,
4109                                        { disposeWhenNodeIsRemoved: node }
4110                                    );
4111                                }
4112                            } catch (ex) {
4113                                ex.message = "Unable to process binding \"" + bindingKey + ": " + bindings[bindingKey] + "\"\nMessage: " + ex.message;
4114                                throw ex;
4115                            }
4116                        });
4117                    }
4118
4119                    var shouldBindDescendants = bindingHandlerThatControlsDescendantBindings === undefined;
4120                    return {
4121                        'shouldBindDescendants': shouldBindDescendants,
4122                        'bindingContextForDescendants': shouldBindDescendants && contextToExtend
4123                    };
4124                };
4125
4126                ko.storedBindingContextForNode = function (node) {
4127                    var bindingInfo = ko.utils.domData.get(node, boundElementDomDataKey);
4128                    return bindingInfo && bindingInfo.context;
4129                }
4130
4131                function getBindingContext(viewModelOrBindingContext, extendContextCallback) {
4132                    return viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
4133                        ? viewModelOrBindingContext
4134                        : new ko.bindingContext(viewModelOrBindingContext, undefined, undefined, extendContextCallback);
4135                }
4136
4137                ko.applyBindingAccessorsToNode = function (node, bindings, viewModelOrBindingContext) {
4138                    if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
4139                        ko.virtualElements.normaliseVirtualElementDomStructure(node);
4140                    return applyBindingsToNodeInternal(node, bindings, getBindingContext(viewModelOrBindingContext));
4141                };
4142
4143                ko.applyBindingsToNode = function (node, bindings, viewModelOrBindingContext) {
4144                    var context = getBindingContext(viewModelOrBindingContext);
4145                    return ko.applyBindingAccessorsToNode(node, makeBindingAccessors(bindings, context, node), context);
4146                };
4147
4148                ko.applyBindingsToDescendants = function (viewModelOrBindingContext, rootNode) {
4149                    if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
4150                        applyBindingsToDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode);
4151                };
4152
4153                ko.applyBindings = function (viewModelOrBindingContext, rootNode, extendContextCallback) {
4154                    // If jQuery is loaded after Knockout, we won't initially have access to it. So save it here.
4155                    if (!jQueryInstance && window['jQuery']) {
4156                        jQueryInstance = window['jQuery'];
4157                    }
4158
4159                    if (arguments.length < 2) {
4160                        rootNode = document.body;
4161                        if (!rootNode) {
4162                            throw Error("ko.applyBindings: could not find document.body; has the document been loaded?");
4163                        }
4164                    } else if (!rootNode || (rootNode.nodeType !== 1 && rootNode.nodeType !== 8)) {
4165                        throw Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
4166                    }
4167
4168                    applyBindingsToNodeAndDescendantsInternal(getBindingContext(viewModelOrBindingContext, extendContextCallback), rootNode);
4169                };
4170
4171                // Retrieving binding context from arbitrary nodes
4172                ko.contextFor = function (node) {
4173                    // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
4174                    if (node && (node.nodeType === 1 || node.nodeType === 8)) {
4175                        return ko.storedBindingContextForNode(node);
4176                    }
4177                    return undefined;
4178                };
4179                ko.dataFor = function (node) {
4180                    var context = ko.contextFor(node);
4181                    return context ? context['$data'] : undefined;
4182                };
4183
4184                ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
4185                ko.exportSymbol('bindingEvent', ko.bindingEvent);
4186                ko.exportSymbol('bindingEvent.subscribe', ko.bindingEvent.subscribe);
4187                ko.exportSymbol('bindingEvent.startPossiblyAsyncContentBinding', ko.bindingEvent.startPossiblyAsyncContentBinding);
4188                ko.exportSymbol('applyBindings', ko.applyBindings);
4189                ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
4190                ko.exportSymbol('applyBindingAccessorsToNode', ko.applyBindingAccessorsToNode);
4191                ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
4192                ko.exportSymbol('contextFor', ko.contextFor);
4193                ko.exportSymbol('dataFor', ko.dataFor);
4194            })();
4195            (function (undefined) {
4196                var loadingSubscribablesCache = {}, // Tracks component loads that are currently in flight
4197                    loadedDefinitionsCache = {};    // Tracks component loads that have already completed
4198
4199                ko.components = {
4200                    get: function (componentName, callback) {
4201                        var cachedDefinition = getObjectOwnProperty(loadedDefinitionsCache, componentName);
4202                        if (cachedDefinition) {
4203                            // It's already loaded and cached. Reuse the same definition object.
4204                            // Note that for API consistency, even cache hits complete asynchronously by default.
4205                            // You can bypass this by putting synchronous:true on your component config.
4206                            if (cachedDefinition.isSynchronousComponent) {
4207                                ko.dependencyDetection.ignore(function () { // See comment in loaderRegistryBehaviors.js for reasoning
4208                                    callback(cachedDefinition.definition);
4209                                });
4210                            } else {
4211                                ko.tasks.schedule(function () { callback(cachedDefinition.definition); });
4212                            }
4213                        } else {
4214                            // Join the loading process that is already underway, or start a new one.
4215                            loadComponentAndNotify(componentName, callback);
4216                        }
4217                    },
4218
4219                    clearCachedDefinition: function (componentName) {
4220                        delete loadedDefinitionsCache[componentName];
4221                    },
4222
4223                    _getFirstResultFromLoaders: getFirstResultFromLoaders
4224                };
4225
4226                function getObjectOwnProperty(obj, propName) {
4227                    return Object.prototype.hasOwnProperty.call(obj, propName) ? obj[propName] : undefined;
4228                }
4229
4230                function loadComponentAndNotify(componentName, callback) {
4231                    var subscribable = getObjectOwnProperty(loadingSubscribablesCache, componentName),
4232                        completedAsync;
4233                    if (!subscribable) {
4234                        // It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache.
4235                        subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable();
4236                        subscribable.subscribe(callback);
4237
4238                        beginLoadingComponent(componentName, function (definition, config) {
4239                            var isSynchronousComponent = !!(config && config['synchronous']);
4240                            loadedDefinitionsCache[componentName] = { definition: definition, isSynchronousComponent: isSynchronousComponent };
4241                            delete loadingSubscribablesCache[componentName];
4242
4243                            // For API consistency, all loads complete asynchronously. However we want to avoid
4244                            // adding an extra task schedule if it's unnecessary (i.e., the completion is already
4245                            // async).
4246                            //
4247                            // You can bypass the 'always asynchronous' feature by putting the synchronous:true
4248                            // flag on your component configuration when you register it.
4249                            if (completedAsync || isSynchronousComponent) {
4250                                // Note that notifySubscribers ignores any dependencies read within the callback.
4251                                // See comment in loaderRegistryBehaviors.js for reasoning
4252                                subscribable['notifySubscribers'](definition);
4253                            } else {
4254                                ko.tasks.schedule(function () {
4255                                    subscribable['notifySubscribers'](definition);
4256                                });
4257                            }
4258                        });
4259                        completedAsync = true;
4260                    } else {
4261                        subscribable.subscribe(callback);
4262                    }
4263                }
4264
4265                function beginLoadingComponent(componentName, callback) {
4266                    getFirstResultFromLoaders('getConfig', [componentName], function (config) {
4267                        if (config) {
4268                            // We have a config, so now load its definition
4269                            getFirstResultFromLoaders('loadComponent', [componentName, config], function (definition) {
4270                                callback(definition, config);
4271                            });
4272                        } else {
4273                            // The component has no config - it's unknown to all the loaders.
4274                            // Note that this is not an error (e.g., a module loading error) - that would abort the
4275                            // process and this callback would not run. For this callback to run, all loaders must
4276                            // have confirmed they don't know about this component.
4277                            callback(null, null);
4278                        }
4279                    });
4280                }
4281
4282                function getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders) {
4283                    // On the first call in the stack, start with the full set of loaders
4284                    if (!candidateLoaders) {
4285                        candidateLoaders = ko.components['loaders'].slice(0); // Use a copy, because we'll be mutating this array
4286                    }
4287
4288                    // Try the next candidate
4289                    var currentCandidateLoader = candidateLoaders.shift();
4290                    if (currentCandidateLoader) {
4291                        var methodInstance = currentCandidateLoader[methodName];
4292                        if (methodInstance) {
4293                            var wasAborted = false,
4294                                synchronousReturnValue = methodInstance.apply(currentCandidateLoader, argsExceptCallback.concat(function (result) {
4295                                    if (wasAborted) {
4296                                        callback(null);
4297                                    } else if (result !== null) {
4298                                        // This candidate returned a value. Use it.
4299                                        callback(result);
4300                                    } else {
4301                                        // Try the next candidate
4302                                        getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
4303                                    }
4304                                }));
4305
4306                            // Currently, loaders may not return anything synchronously. This leaves open the possibility
4307                            // that we'll extend the API to support synchronous return values in the future. It won't be
4308                            // a breaking change, because currently no loader is allowed to return anything except undefined.
4309                            if (synchronousReturnValue !== undefined) {
4310                                wasAborted = true;
4311
4312                                // Method to suppress exceptions will remain undocumented. This is only to keep
4313                                // KO's specs running tidily, since we can observe the loading got aborted without
4314                                // having exceptions cluttering up the console too.
4315                                if (!currentCandidateLoader['suppressLoaderExceptions']) {
4316                                    throw new Error('Component loaders must supply values by invoking the callback, not by returning values synchronously.');
4317                                }
4318                            }
4319                        } else {
4320                            // This candidate doesn't have the relevant handler. Synchronously move on to the next one.
4321                            getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
4322                        }
4323                    } else {
4324                        // No candidates returned a value
4325                        callback(null);
4326                    }
4327                }
4328
4329                // Reference the loaders via string name so it's possible for developers
4330                // to replace the whole array by assigning to ko.components.loaders
4331                ko.components['loaders'] = [];
4332
4333                ko.exportSymbol('components', ko.components);
4334                ko.exportSymbol('components.get', ko.components.get);
4335                ko.exportSymbol('components.clearCachedDefinition', ko.components.clearCachedDefinition);
4336            })();
4337            (function (undefined) {
4338
4339                // The default loader is responsible for two things:
4340                // 1. Maintaining the default in-memory registry of component configuration objects
4341                //    (i.e., the thing you're writing to when you call ko.components.register(someName, ...))
4342                // 2. Answering requests for components by fetching configuration objects
4343                //    from that default in-memory registry and resolving them into standard
4344                //    component definition objects (of the form { createViewModel: ..., template: ... })
4345                // Custom loaders may override either of these facilities, i.e.,
4346                // 1. To supply configuration objects from some other source (e.g., conventions)
4347                // 2. Or, to resolve configuration objects by loading viewmodels/templates via arbitrary logic.
4348
4349                var defaultConfigRegistry = {};
4350
4351                ko.components.register = function (componentName, config) {
4352                    if (!config) {
4353                        throw new Error('Invalid configuration for ' + componentName);
4354                    }
4355
4356                    if (ko.components.isRegistered(componentName)) {
4357                        throw new Error('Component ' + componentName + ' is already registered');
4358                    }
4359
4360                    defaultConfigRegistry[componentName] = config;
4361                };
4362
4363                ko.components.isRegistered = function (componentName) {
4364                    return Object.prototype.hasOwnProperty.call(defaultConfigRegistry, componentName);
4365                };
4366
4367                ko.components.unregister = function (componentName) {
4368                    delete defaultConfigRegistry[componentName];
4369                    ko.components.clearCachedDefinition(componentName);
4370                };
4371
4372                ko.components.defaultLoader = {
4373                    'getConfig': function (componentName, callback) {
4374                        var result = ko.components.isRegistered(componentName)
4375                            ? defaultConfigRegistry[componentName]
4376                            : null;
4377                        callback(result);
4378                    },
4379
4380                    'loadComponent': function (componentName, config, callback) {
4381                        var errorCallback = makeErrorCallback(componentName);
4382                        possiblyGetConfigFromAmd(errorCallback, config, function (loadedConfig) {
4383                            resolveConfig(componentName, errorCallback, loadedConfig, callback);
4384                        });
4385                    },
4386
4387                    'loadTemplate': function (componentName, templateConfig, callback) {
4388                        resolveTemplate(makeErrorCallback(componentName), templateConfig, callback);
4389                    },
4390
4391                    'loadViewModel': function (componentName, viewModelConfig, callback) {
4392                        resolveViewModel(makeErrorCallback(componentName), viewModelConfig, callback);
4393                    }
4394                };
4395
4396                var createViewModelKey = 'createViewModel';
4397
4398                // Takes a config object of the form { template: ..., viewModel: ... }, and asynchronously convert it
4399                // into the standard component definition format:
4400                //    { template: <ArrayOfDomNodes>, createViewModel: function(params, componentInfo) { ... } }.
4401                // Since both template and viewModel may need to be resolved asynchronously, both tasks are performed
4402                // in parallel, and the results joined when both are ready. We don't depend on any promises infrastructure,
4403                // so this is implemented manually below.
4404                function resolveConfig(componentName, errorCallback, config, callback) {
4405                    var result = {},
4406                        makeCallBackWhenZero = 2,
4407                        tryIssueCallback = function () {
4408                            if (--makeCallBackWhenZero === 0) {
4409                                callback(result);
4410                            }
4411                        },
4412                        templateConfig = config['template'],
4413                        viewModelConfig = config['viewModel'];
4414
4415                    if (templateConfig) {
4416                        possiblyGetConfigFromAmd(errorCallback, templateConfig, function (loadedConfig) {
4417                            ko.components._getFirstResultFromLoaders('loadTemplate', [componentName, loadedConfig], function (resolvedTemplate) {
4418                                result['template'] = resolvedTemplate;
4419                                tryIssueCallback();
4420                            });
4421                        });
4422                    } else {
4423                        tryIssueCallback();
4424                    }
4425
4426                    if (viewModelConfig) {
4427                        possiblyGetConfigFromAmd(errorCallback, viewModelConfig, function (loadedConfig) {
4428                            ko.components._getFirstResultFromLoaders('loadViewModel', [componentName, loadedConfig], function (resolvedViewModel) {
4429                                result[createViewModelKey] = resolvedViewModel;
4430                                tryIssueCallback();
4431                            });
4432                        });
4433                    } else {
4434                        tryIssueCallback();
4435                    }
4436                }
4437
4438                function resolveTemplate(errorCallback, templateConfig, callback) {
4439                    if (typeof templateConfig === 'string') {
4440                        // Markup - parse it
4441                        callback(ko.utils.parseHtmlFragment(templateConfig));
4442                    } else if (templateConfig instanceof Array) {
4443                        // Assume already an array of DOM nodes - pass through unchanged
4444                        callback(templateConfig);
4445                    } else if (isDocumentFragment(templateConfig)) {
4446                        // Document fragment - use its child nodes
4447                        callback(ko.utils.makeArray(templateConfig.childNodes));
4448                    } else if (templateConfig['element']) {
4449                        var element = templateConfig['element'];
4450                        if (isDomElement(element)) {
4451                            // Element instance - copy its child nodes
4452                            callback(cloneNodesFromTemplateSourceElement(element));
4453                        } else if (typeof element === 'string') {
4454                            // Element ID - find it, then copy its child nodes
4455                            var elemInstance = document.getElementById(element);
4456                            if (elemInstance) {
4457                                callback(cloneNodesFromTemplateSourceElement(elemInstance));
4458                            } else {
4459                                errorCallback('Cannot find element with ID ' + element);
4460                            }
4461                        } else {
4462                            errorCallback('Unknown element type: ' + element);
4463                        }
4464                    } else {
4465                        errorCallback('Unknown template value: ' + templateConfig);
4466                    }
4467                }
4468
4469                function resolveViewModel(errorCallback, viewModelConfig, callback) {
4470                    if (typeof viewModelConfig === 'function') {
4471                        // Constructor - convert to standard factory function format
4472                        // By design, this does *not* supply componentInfo to the constructor, as the intent is that
4473                        // componentInfo contains non-viewmodel data (e.g., the component's element) that should only
4474                        // be used in factory functions, not viewmodel constructors.
4475                        callback(function (params /*, componentInfo */) {
4476                            return new viewModelConfig(params);
4477                        });
4478                    } else if (typeof viewModelConfig[createViewModelKey] === 'function') {
4479                        // Already a factory function - use it as-is
4480                        callback(viewModelConfig[createViewModelKey]);
4481                    } else if ('instance' in viewModelConfig) {
4482                        // Fixed object instance - promote to createViewModel format for API consistency
4483                        var fixedInstance = viewModelConfig['instance'];
4484                        callback(function (params, componentInfo) {
4485                            return fixedInstance;
4486                        });
4487                    } else if ('viewModel' in viewModelConfig) {
4488                        // Resolved AMD module whose value is of the form { viewModel: ... }
4489                        resolveViewModel(errorCallback, viewModelConfig['viewModel'], callback);
4490                    } else {
4491                        errorCallback('Unknown viewModel value: ' + viewModelConfig);
4492                    }
4493                }
4494
4495                function cloneNodesFromTemplateSourceElement(elemInstance) {
4496                    switch (ko.utils.tagNameLower(elemInstance)) {
4497                        case 'script':
4498                            return ko.utils.parseHtmlFragment(elemInstance.text);
4499                        case 'textarea':
4500                            return ko.utils.parseHtmlFragment(elemInstance.value);
4501                        case 'template':
4502                            // For browsers with proper <template> element support (i.e., where the .content property
4503                            // gives a document fragment), use that document fragment.
4504                            if (isDocumentFragment(elemInstance.content)) {
4505                                return ko.utils.cloneNodes(elemInstance.content.childNodes);
4506                            }
4507                    }
4508
4509                    // Regular elements such as <div>, and <template> elements on old browsers that don't really
4510                    // understand <template> and just treat it as a regular container
4511                    return ko.utils.cloneNodes(elemInstance.childNodes);
4512                }
4513
4514                function isDomElement(obj) {
4515                    if (window['HTMLElement']) {
4516                        return obj instanceof HTMLElement;
4517                    } else {
4518                        return obj && obj.tagName && obj.nodeType === 1;
4519                    }
4520                }
4521
4522                function isDocumentFragment(obj) {
4523                    if (window['DocumentFragment']) {
4524                        return obj instanceof DocumentFragment;
4525                    } else {
4526                        return obj && obj.nodeType === 11;
4527                    }
4528                }
4529
4530                function possiblyGetConfigFromAmd(errorCallback, config, callback) {
4531                    if (typeof config['require'] === 'string') {
4532                        // The config is the value of an AMD module
4533                        if (amdRequire || window['require']) {
4534                            (amdRequire || window['require'])([config['require']], function (module) {
4535                                if (module && typeof module === 'object' && module.__esModule && module.default) {
4536                                    module = module.default;
4537                                }
4538                                callback(module);
4539                            });
4540                        } else {
4541                            errorCallback('Uses require, but no AMD loader is present');
4542                        }
4543                    } else {
4544                        callback(config);
4545                    }
4546                }
4547
4548                function makeErrorCallback(componentName) {
4549                    return function (message) {
4550                        throw new Error('Component \'' + componentName + '\': ' + message);
4551                    };
4552                }
4553
4554                ko.exportSymbol('components.register', ko.components.register);
4555                ko.exportSymbol('components.isRegistered', ko.components.isRegistered);
4556                ko.exportSymbol('components.unregister', ko.components.unregister);
4557
4558                // Expose the default loader so that developers can directly ask it for configuration
4559                // or to resolve configuration
4560                ko.exportSymbol('components.defaultLoader', ko.components.defaultLoader);
4561
4562                // By default, the default loader is the only registered component loader
4563                ko.components['loaders'].push(ko.components.defaultLoader);
4564
4565                // Privately expose the underlying config registry for use in old-IE shim
4566                ko.components._allRegisteredComponents = defaultConfigRegistry;
4567            })();
4568            (function (undefined) {
4569                // Overridable API for determining which component name applies to a given node. By overriding this,
4570                // you can for example map specific tagNames to components that are not preregistered.
4571                ko.components['getComponentNameForNode'] = function (node) {
4572                    var tagNameLower = ko.utils.tagNameLower(node);
4573                    if (ko.components.isRegistered(tagNameLower)) {
4574                        // Try to determine that this node can be considered a *custom* element; see https://github.com/knockout/knockout/issues/1603
4575                        if (tagNameLower.indexOf('-') != -1 || ('' + node) == "[object HTMLUnknownElement]" || (ko.utils.ieVersion <= 8 && node.tagName === tagNameLower)) {
4576                            return tagNameLower;
4577                        }
4578                    }
4579                };
4580
4581                ko.components.addBindingsForCustomElement = function (allBindings, node, bindingContext, valueAccessors) {
4582                    // Determine if it's really a custom element matching a component
4583                    if (node.nodeType === 1) {
4584                        var componentName = ko.components['getComponentNameForNode'](node);
4585                        if (componentName) {
4586                            // It does represent a component, so add a component binding for it
4587                            allBindings = allBindings || {};
4588
4589                            if (allBindings['component']) {
4590                                // Avoid silently overwriting some other 'component' binding that may already be on the element
4591                                throw new Error('Cannot use the "component" binding on a custom element matching a component');
4592                            }
4593
4594                            var componentBindingValue = { 'name': componentName, 'params': getComponentParamsFromCustomElement(node, bindingContext) };
4595
4596                            allBindings['component'] = valueAccessors
4597                                ? function () { return componentBindingValue; }
4598                                : componentBindingValue;
4599                        }
4600                    }
4601
4602                    return allBindings;
4603                }
4604
4605                var nativeBindingProviderInstance = new ko.bindingProvider();
4606
4607                function getComponentParamsFromCustomElement(elem, bindingContext) {
4608                    var paramsAttribute = elem.getAttribute('params');
4609
4610                    if (paramsAttribute) {
4611                        var params = nativeBindingProviderInstance['parseBindingsString'](paramsAttribute, bindingContext, elem, { 'valueAccessors': true, 'bindingParams': true }),
4612                            rawParamComputedValues = ko.utils.objectMap(params, function (paramValue, paramName) {
4613                                return ko.computed(paramValue, null, { disposeWhenNodeIsRemoved: elem });
4614                            }),
4615                            result = ko.utils.objectMap(rawParamComputedValues, function (paramValueComputed, paramName) {
4616                                var paramValue = paramValueComputed.peek();
4617                                // Does the evaluation of the parameter value unwrap any observables?
4618                                if (!paramValueComputed.isActive()) {
4619                                    // No it doesn't, so there's no need for any computed wrapper. Just pass through the supplied value directly.
4620                                    // Example: "someVal: firstName, age: 123" (whether or not firstName is an observable/computed)
4621                                    return paramValue;
4622                                } else {
4623                                    // Yes it does. Supply a computed property that unwraps both the outer (binding expression)
4624                                    // level of observability, and any inner (resulting model value) level of observability.
4625                                    // This means the component doesn't have to worry about multiple unwrapping. If the value is a
4626                                    // writable observable, the computed will also be writable and pass the value on to the observable.
4627                                    return ko.computed({
4628                                        'read': function () {
4629                                            return ko.utils.unwrapObservable(paramValueComputed());
4630                                        },
4631                                        'write': ko.isWriteableObservable(paramValue) && function (value) {
4632                                            paramValueComputed()(value);
4633                                        },
4634                                        disposeWhenNodeIsRemoved: elem
4635                                    });
4636                                }
4637                            });
4638
4639                        // Give access to the raw computeds, as long as that wouldn't overwrite any custom param also called '$raw'
4640                        // This is in case the developer wants to react to outer (binding) observability separately from inner
4641                        // (model value) observability, or in case the model value observable has subobservables.
4642                        if (!Object.prototype.hasOwnProperty.call(result, '$raw')) {
4643                            result['$raw'] = rawParamComputedValues;
4644                        }
4645
4646                        return result;
4647                    } else {
4648                        // For consistency, absence of a "params" attribute is treated the same as the presence of
4649                        // any empty one. Otherwise component viewmodels need special code to check whether or not
4650                        // 'params' or 'params.$raw' is null/undefined before reading subproperties, which is annoying.
4651                        return { '$raw': {} };
4652                    }
4653                }
4654
4655                // --------------------------------------------------------------------------------
4656                // Compatibility code for older (pre-HTML5) IE browsers
4657
4658                if (ko.utils.ieVersion < 9) {
4659                    // Whenever you preregister a component, enable it as a custom element in the current document
4660                    ko.components['register'] = (function (originalFunction) {
4661                        return function (componentName) {
4662                            document.createElement(componentName); // Allows IE<9 to parse markup containing the custom element
4663                            return originalFunction.apply(this, arguments);
4664                        }
4665                    })(ko.components['register']);
4666
4667                    // Whenever you create a document fragment, enable all preregistered component names as custom elements
4668                    // This is needed to make innerShiv/jQuery HTML parsing correctly handle the custom elements
4669                    document.createDocumentFragment = (function (originalFunction) {
4670                        return function () {
4671                            var newDocFrag = originalFunction(),
4672                                allComponents = ko.components._allRegisteredComponents;
4673                            for (var componentName in allComponents) {
4674                                if (Object.prototype.hasOwnProperty.call(allComponents, componentName)) {
4675                                    newDocFrag.createElement(componentName);
4676                                }
4677                            }
4678                            return newDocFrag;
4679                        };
4680                    })(document.createDocumentFragment);
4681                }
4682            })(); (function (undefined) {
4683                var componentLoadingOperationUniqueId = 0;
4684
4685                ko.bindingHandlers['component'] = {
4686                    'init': function (element, valueAccessor, ignored1, ignored2, bindingContext) {
4687                        var currentViewModel,
4688                            currentLoadingOperationId,
4689                            afterRenderSub,
4690                            disposeAssociatedComponentViewModel = function () {
4691                                var currentViewModelDispose = currentViewModel && currentViewModel['dispose'];
4692                                if (typeof currentViewModelDispose === 'function') {
4693                                    currentViewModelDispose.call(currentViewModel);
4694                                }
4695                                if (afterRenderSub) {
4696                                    afterRenderSub.dispose();
4697                                }
4698                                afterRenderSub = null;
4699                                currentViewModel = null;
4700                                // Any in-flight loading operation is no longer relevant, so make sure we ignore its completion
4701                                currentLoadingOperationId = null;
4702                            },
4703                            originalChildNodes = ko.utils.makeArray(ko.virtualElements.childNodes(element));
4704
4705                        ko.virtualElements.emptyNode(element);
4706                        ko.utils.domNodeDisposal.addDisposeCallback(element, disposeAssociatedComponentViewModel);
4707
4708                        ko.computed(function () {
4709                            var value = ko.utils.unwrapObservable(valueAccessor()),
4710                                componentName, componentParams;
4711
4712                            if (typeof value === 'string') {
4713                                componentName = value;
4714                            } else {
4715                                componentName = ko.utils.unwrapObservable(value['name']);
4716                                componentParams = ko.utils.unwrapObservable(value['params']);
4717                            }
4718
4719                            if (!componentName) {
4720                                throw new Error('No component name specified');
4721                            }
4722
4723                            var asyncContext = ko.bindingEvent.startPossiblyAsyncContentBinding(element, bindingContext);
4724
4725                            var loadingOperationId = currentLoadingOperationId = ++componentLoadingOperationUniqueId;
4726                            ko.components.get(componentName, function (componentDefinition) {
4727                                // If this is not the current load operation for this element, ignore it.
4728                                if (currentLoadingOperationId !== loadingOperationId) {
4729                                    return;
4730                                }
4731
4732                                // Clean up previous state
4733                                disposeAssociatedComponentViewModel();
4734
4735                                // Instantiate and bind new component. Implicitly this cleans any old DOM nodes.
4736                                if (!componentDefinition) {
4737                                    throw new Error('Unknown component \'' + componentName + '\'');
4738                                }
4739                                cloneTemplateIntoElement(componentName, componentDefinition, element);
4740
4741                                var componentInfo = {
4742                                    'element': element,
4743                                    'templateNodes': originalChildNodes
4744                                };
4745
4746                                var componentViewModel = createViewModel(componentDefinition, componentParams, componentInfo),
4747                                    childBindingContext = asyncContext['createChildContext'](componentViewModel, {
4748                                        'extend': function (ctx) {
4749                                            ctx['$component'] = componentViewModel;
4750                                            ctx['$componentTemplateNodes'] = originalChildNodes;
4751                                        }
4752                                    });
4753
4754                                if (componentViewModel && componentViewModel['koDescendantsComplete']) {
4755                                    afterRenderSub = ko.bindingEvent.subscribe(element, ko.bindingEvent.descendantsComplete, componentViewModel['koDescendantsComplete'], componentViewModel);
4756                                }
4757
4758                                currentViewModel = componentViewModel;
4759                                ko.applyBindingsToDescendants(childBindingContext, element);
4760                            });
4761                        }, null, { disposeWhenNodeIsRemoved: element });
4762
4763                        return { 'controlsDescendantBindings': true };
4764                    }
4765                };
4766
4767                ko.virtualElements.allowedBindings['component'] = true;
4768
4769                function cloneTemplateIntoElement(componentName, componentDefinition, element) {
4770                    var template = componentDefinition['template'];
4771                    if (!template) {
4772                        throw new Error('Component \'' + componentName + '\' has no template');
4773                    }
4774
4775                    var clonedNodesArray = ko.utils.cloneNodes(template);
4776                    ko.virtualElements.setDomNodeChildren(element, clonedNodesArray);
4777                }
4778
4779                function createViewModel(componentDefinition, componentParams, componentInfo) {
4780                    var componentViewModelFactory = componentDefinition['createViewModel'];
4781                    return componentViewModelFactory
4782                        ? componentViewModelFactory.call(componentDefinition, componentParams, componentInfo)
4783                        : componentParams; // Template-only component
4784                }
4785
4786            })();
4787            var attrHtmlToJavaScriptMap = { 'class': 'className', 'for': 'htmlFor' };
4788            ko.bindingHandlers['attr'] = {
4789                'update': function (element, valueAccessor, allBindings) {
4790                    var value = ko.utils.unwrapObservable(valueAccessor()) || {};
4791                    ko.utils.objectForEach(value, function (attrName, attrValue) {
4792                        attrValue = ko.utils.unwrapObservable(attrValue);
4793
4794                        // Find the namespace of this attribute, if any.
4795                        var prefixLen = attrName.indexOf(':');
4796                        var namespace = "lookupNamespaceURI" in element && prefixLen > 0 && element.lookupNamespaceURI(attrName.substr(0, prefixLen));
4797
4798                        // To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
4799                        // when someProp is a "no value"-like value (strictly null, false, or undefined)
4800                        // (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
4801                        var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
4802                        if (toRemove) {
4803                            namespace ? element.removeAttributeNS(namespace, attrName) : element.removeAttribute(attrName);
4804                        } else {
4805                            attrValue = attrValue.toString();
4806                        }
4807
4808                        // In IE <= 7 and IE8 Quirks Mode, you have to use the JavaScript property name instead of the
4809                        // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
4810                        // but instead of figuring out the mode, we'll just set the attribute through the JavaScript
4811                        // property for IE <= 8.
4812                        if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavaScriptMap) {
4813                            attrName = attrHtmlToJavaScriptMap[attrName];
4814                            if (toRemove)
4815                                element.removeAttribute(attrName);
4816                            else
4817                                element[attrName] = attrValue;
4818                        } else if (!toRemove) {
4819                            namespace ? element.setAttributeNS(namespace, attrName, attrValue) : element.setAttribute(attrName, attrValue);
4820                        }
4821
4822                        // Treat "name" specially - although you can think of it as an attribute, it also needs
4823                        // special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)
4824                        // Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing
4825                        // entirely, and there's no strong reason to allow for such casing in HTML.
4826                        if (attrName === "name") {
4827                            ko.utils.setElementName(element, toRemove ? "" : attrValue);
4828                        }
4829                    });
4830                }
4831            };
4832            (function () {
4833
4834                ko.bindingHandlers['checked'] = {
4835                    'after': ['value', 'attr'],
4836                    'init': function (element, valueAccessor, allBindings) {
4837                        var checkedValue = ko.pureComputed(function () {
4838                            // Treat "value" like "checkedValue" when it is included with "checked" binding
4839                            if (allBindings['has']('checkedValue')) {
4840                                return ko.utils.unwrapObservable(allBindings.get('checkedValue'));
4841                            } else if (useElementValue) {
4842                                if (allBindings['has']('value')) {
4843                                    return ko.utils.unwrapObservable(allBindings.get('value'));
4844                                } else {
4845                                    return element.value;
4846                                }
4847                            }
4848                        });
4849
4850                        function updateModel() {
4851                            // This updates the model value from the view value.
4852                            // It runs in response to DOM events (click) and changes in checkedValue.
4853                            var isChecked = element.checked,
4854                                elemValue = checkedValue();
4855
4856                            // When we're first setting up this computed, don't change any model state.
4857                            if (ko.computedContext.isInitial()) {
4858                                return;
4859                            }
4860
4861                            // We can ignore unchecked radio buttons, because some other radio
4862                            // button will be checked, and that one can take care of updating state.
4863                            // Also ignore value changes to an already unchecked checkbox.
4864                            if (!isChecked && (isRadio || ko.computedContext.getDependenciesCount())) {
4865                                return;
4866                            }
4867
4868                            var modelValue = ko.dependencyDetection.ignore(valueAccessor);
4869                            if (valueIsArray) {
4870                                var writableValue = rawValueIsNonArrayObservable ? modelValue.peek() : modelValue,
4871                                    saveOldValue = oldElemValue;
4872                                oldElemValue = elemValue;
4873
4874                                if (saveOldValue !== elemValue) {
4875                                    // When we're responding to the checkedValue changing, and the element is
4876                                    // currently checked, replace the old elem value with the new elem value
4877                                    // in the model array.
4878                                    if (isChecked) {
4879                                        ko.utils.addOrRemoveItem(writableValue, elemValue, true);
4880                                        ko.utils.addOrRemoveItem(writableValue, saveOldValue, false);
4881                                    }
4882                                } else {
4883                                    // When we're responding to the user having checked/unchecked a checkbox,
4884                                    // add/remove the element value to the model array.
4885                                    ko.utils.addOrRemoveItem(writableValue, elemValue, isChecked);
4886                                }
4887
4888                                if (rawValueIsNonArrayObservable && ko.isWriteableObservable(modelValue)) {
4889                                    modelValue(writableValue);
4890                                }
4891                            } else {
4892                                if (isCheckbox) {
4893                                    if (elemValue === undefined) {
4894                                        elemValue = isChecked;
4895                                    } else if (!isChecked) {
4896                                        elemValue = undefined;
4897                                    }
4898                                }
4899                                ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'checked', elemValue, true);
4900                            }
4901                        };
4902
4903                        function updateView() {
4904                            // This updates the view value from the model value.
4905                            // It runs in response to changes in the bound (checked) value.
4906                            var modelValue = ko.utils.unwrapObservable(valueAccessor()),
4907                                elemValue = checkedValue();
4908
4909                            if (valueIsArray) {
4910                                // When a checkbox is bound to an array, being checked represents its value being present in that array
4911                                element.checked = ko.utils.arrayIndexOf(modelValue, elemValue) >= 0;
4912                                oldElemValue = elemValue;
4913                            } else if (isCheckbox && elemValue === undefined) {
4914                                // When a checkbox is bound to any other value (not an array) and "checkedValue" is not defined,
4915                                // being checked represents the value being trueish
4916                                element.checked = !!modelValue;
4917                            } else {
4918                                // Otherwise, being checked means that the checkbox or radio button's value corresponds to the model value
4919                                element.checked = (checkedValue() === modelValue);
4920                            }
4921                        };
4922
4923                        var isCheckbox = element.type == "checkbox",
4924                            isRadio = element.type == "radio";
4925
4926                        // Only bind to check boxes and radio buttons
4927                        if (!isCheckbox && !isRadio) {
4928                            return;
4929                        }
4930
4931                        var rawValue = valueAccessor(),
4932                            valueIsArray = isCheckbox && (ko.utils.unwrapObservable(rawValue) instanceof Array),
4933                            rawValueIsNonArrayObservable = !(valueIsArray && rawValue.push && rawValue.splice),
4934                            useElementValue = isRadio || valueIsArray,
4935                            oldElemValue = valueIsArray ? checkedValue() : undefined;
4936
4937                        // IE 6 won't allow radio buttons to be selected unless they have a name
4938                        if (isRadio && !element.name)
4939                            ko.bindingHandlers['uniqueName']['init'](element, function () { return true });
4940
4941                        // Set up two computeds to update the binding:
4942
4943                        // The first responds to changes in the checkedValue value and to element clicks
4944                        ko.computed(updateModel, null, { disposeWhenNodeIsRemoved: element });
4945                        ko.utils.registerEventHandler(element, "click", updateModel);
4946
4947                        // The second responds to changes in the model value (the one associated with the checked binding)
4948                        ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
4949
4950                        rawValue = undefined;
4951                    }
4952                };
4953                ko.expressionRewriting.twoWayBindings['checked'] = true;
4954
4955                ko.bindingHandlers['checkedValue'] = {
4956                    'update': function (element, valueAccessor) {
4957                        element.value = ko.utils.unwrapObservable(valueAccessor());
4958                    }
4959                };
4960
4961            })(); var classesWrittenByBindingKey = '__ko__cssValue';
4962            ko.bindingHandlers['class'] = {
4963                'update': function (element, valueAccessor) {
4964                    var value = ko.utils.stringTrim(ko.utils.unwrapObservable(valueAccessor()));
4965                    ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);
4966                    element[classesWrittenByBindingKey] = value;
4967                    ko.utils.toggleDomNodeCssClass(element, value, true);
4968                }
4969            };
4970
4971            ko.bindingHandlers['css'] = {
4972                'update': function (element, valueAccessor) {
4973                    var value = ko.utils.unwrapObservable(valueAccessor());
4974                    if (value !== null && typeof value == "object") {
4975                        ko.utils.objectForEach(value, function (className, shouldHaveClass) {
4976                            shouldHaveClass = ko.utils.unwrapObservable(shouldHaveClass);
4977                            ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
4978                        });
4979                    } else {
4980                        ko.bindingHandlers['class']['update'](element, valueAccessor);
4981                    }
4982                }
4983            };
4984            ko.bindingHandlers['enable'] = {
4985                'update': function (element, valueAccessor) {
4986                    var value = ko.utils.unwrapObservable(valueAccessor());
4987                    if (value && element.disabled)
4988                        element.removeAttribute("disabled");
4989                    else if ((!value) && (!element.disabled))
4990                        element.disabled = true;
4991                }
4992            };
4993
4994            ko.bindingHandlers['disable'] = {
4995                'update': function (element, valueAccessor) {
4996                    ko.bindingHandlers['enable']['update'](element, function () { return !ko.utils.unwrapObservable(valueAccessor()) });
4997                }
4998            };
4999            // For certain common events (currently just 'click'), allow a simplified data-binding syntax
5000            // e.g. click:handler instead of the usual full-length event:{click:handler}
5001            function makeEventHandlerShortcut(eventName) {
5002                ko.bindingHandlers[eventName] = {
5003                    'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
5004                        var newValueAccessor = function () {
5005                            var result = {};
5006                            result[eventName] = valueAccessor();
5007                            return result;
5008                        };
5009                        return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindings, viewModel, bindingContext);
5010                    }
5011                }
5012            }
5013
5014            ko.bindingHandlers['event'] = {
5015                'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
5016                    var eventsToHandle = valueAccessor() || {};
5017                    ko.utils.objectForEach(eventsToHandle, function (eventName) {
5018                        if (typeof eventName == "string") {
5019                            ko.utils.registerEventHandler(element, eventName, function (event) {
5020                                var handlerReturnValue;
5021                                var handlerFunction = valueAccessor()[eventName];
5022                                if (!handlerFunction)
5023                                    return;
5024
5025                                try {
5026                                    // Take all the event args, and prefix with the viewmodel
5027                                    var argsForHandler = ko.utils.makeArray(arguments);
5028                                    viewModel = bindingContext['$data'];
5029                                    argsForHandler.unshift(viewModel);
5030                                    handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
5031                                } finally {
5032                                    if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
5033                                        if (event.preventDefault)
5034                                            event.preventDefault();
5035                                        else
5036                                            event.returnValue = false;
5037                                    }
5038                                }
5039
5040                                var bubble = allBindings.get(eventName + 'Bubble') !== false;
5041                                if (!bubble) {
5042                                    event.cancelBubble = true;
5043                                    if (event.stopPropagation)
5044                                        event.stopPropagation();
5045                                }
5046                            });
5047                        }
5048                    });
5049                }
5050            };
5051            // "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
5052            // "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
5053            ko.bindingHandlers['foreach'] = {
5054                makeTemplateValueAccessor: function (valueAccessor) {
5055                    return function () {
5056                        var modelValue = valueAccessor(),
5057                            unwrappedValue = ko.utils.peekObservable(modelValue);    // Unwrap without setting a dependency here
5058
5059                        // If unwrappedValue is the array, pass in the wrapped value on its own
5060                        // The value will be unwrapped and tracked within the template binding
5061                        // (See https://github.com/SteveSanderson/knockout/issues/523)
5062                        if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
5063                            return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };
5064
5065                        // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
5066                        ko.utils.unwrapObservable(modelValue);
5067                        return {
5068                            'foreach': unwrappedValue['data'],
5069                            'as': unwrappedValue['as'],
5070                            'noChildContext': unwrappedValue['noChildContext'],
5071                            'includeDestroyed': unwrappedValue['includeDestroyed'],
5072                            'afterAdd': unwrappedValue['afterAdd'],
5073                            'beforeRemove': unwrappedValue['beforeRemove'],
5074                            'afterRender': unwrappedValue['afterRender'],
5075                            'beforeMove': unwrappedValue['beforeMove'],
5076                            'afterMove': unwrappedValue['afterMove'],
5077                            'templateEngine': ko.nativeTemplateEngine.instance
5078                        };
5079                    };
5080                },
5081                'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
5082                    return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
5083                },
5084                'update': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
5085                    return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindings, viewModel, bindingContext);
5086                }
5087            };
5088            ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
5089            ko.virtualElements.allowedBindings['foreach'] = true;
5090            var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';
5091            var hasfocusLastValue = '__ko_hasfocusLastValue';
5092            ko.bindingHandlers['hasfocus'] = {
5093                'init': function (element, valueAccessor, allBindings) {
5094                    var handleElementFocusChange = function (isFocused) {
5095                        // Where possible, ignore which event was raised and determine focus state using activeElement,
5096                        // as this avoids phantom focus/blur events raised when changing tabs in modern browsers.
5097                        // However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,
5098                        // prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus
5099                        // from calling 'blur()' on the element when it loses focus.
5100                        // Discussion at https://github.com/SteveSanderson/knockout/pull/352
5101                        element[hasfocusUpdatingProperty] = true;
5102                        var ownerDoc = element.ownerDocument;
5103                        if ("activeElement" in ownerDoc) {
5104                            var active;
5105                            try {
5106                                active = ownerDoc.activeElement;
5107                            } catch (e) {
5108                                // IE9 throws if you access activeElement during page load (see issue #703)
5109                                active = ownerDoc.body;
5110                            }
5111                            isFocused = (active === element);
5112                        }
5113                        var modelValue = valueAccessor();
5114                        ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'hasfocus', isFocused, true);
5115
5116                        //cache the latest value, so we can avoid unnecessarily calling focus/blur in the update function
5117                        element[hasfocusLastValue] = isFocused;
5118                        element[hasfocusUpdatingProperty] = false;
5119                    };
5120                    var handleElementFocusIn = handleElementFocusChange.bind(null, true);
5121                    var handleElementFocusOut = handleElementFocusChange.bind(null, false);
5122
5123                    ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);
5124                    ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE
5125                    ko.utils.registerEventHandler(element, "blur", handleElementFocusOut);
5126                    ko.utils.registerEventHandler(element, "focusout", handleElementFocusOut); // For IE
5127
5128                    // Assume element is not focused (prevents "blur" being called initially)
5129                    element[hasfocusLastValue] = false;
5130                },
5131                'update': function (element, valueAccessor) {
5132                    var value = !!ko.utils.unwrapObservable(valueAccessor());
5133
5134                    if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) {
5135                        value ? element.focus() : element.blur();
5136
5137                        // In IE, the blur method doesn't always cause the element to lose focus (for example, if the window is not in focus).
5138                        // Setting focus to the body element does seem to be reliable in IE, but should only be used if we know that the current
5139                        // element was focused already.
5140                        if (!value && element[hasfocusLastValue]) {
5141                            element.ownerDocument.body.focus();
5142                        }
5143
5144                        // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
5145                        ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]);
5146                    }
5147                }
5148            };
5149            ko.expressionRewriting.twoWayBindings['hasfocus'] = true;
5150
5151            ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make "hasFocus" an alias
5152            ko.expressionRewriting.twoWayBindings['hasFocus'] = 'hasfocus';
5153            ko.bindingHandlers['html'] = {
5154                'init': function () {
5155                    // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
5156                    return { 'controlsDescendantBindings': true };
5157                },
5158                'update': function (element, valueAccessor) {
5159                    // setHtml will unwrap the value if needed
5160                    ko.utils.setHtml(element, valueAccessor());
5161                }
5162            };
5163            (function () {
5164
5165                // Makes a binding like with or if
5166                function makeWithIfBinding(bindingKey, isWith, isNot) {
5167                    ko.bindingHandlers[bindingKey] = {
5168                        'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
5169                            var didDisplayOnLastUpdate, savedNodes, contextOptions = {}, completeOnRender, needAsyncContext, renderOnEveryChange;
5170
5171                            if (isWith) {
5172                                var as = allBindings.get('as'), noChildContext = allBindings.get('noChildContext');
5173                                renderOnEveryChange = !(as && noChildContext);
5174                                contextOptions = { 'as': as, 'noChildContext': noChildContext, 'exportDependencies': renderOnEveryChange };
5175                            }
5176
5177                            completeOnRender = allBindings.get("completeOn") == "render";
5178                            needAsyncContext = completeOnRender || allBindings['has'](ko.bindingEvent.descendantsComplete);
5179
5180                            ko.computed(function () {
5181                                var value = ko.utils.unwrapObservable(valueAccessor()),
5182                                    shouldDisplay = !isNot !== !value, // equivalent to isNot ? !value : !!value,
5183                                    isInitial = !savedNodes,
5184                                    childContext;
5185
5186                                if (!renderOnEveryChange && shouldDisplay === didDisplayOnLastUpdate) {
5187                                    return;
5188                                }
5189
5190                                if (needAsyncContext) {
5191                                    bindingContext = ko.bindingEvent.startPossiblyAsyncContentBinding(element, bindingContext);
5192                                }
5193
5194                                if (shouldDisplay) {
5195                                    if (!isWith || renderOnEveryChange) {
5196                                        contextOptions['dataDependency'] = ko.computedContext.computed();
5197                                    }
5198
5199                                    if (isWith) {
5200                                        childContext = bindingContext['createChildContext'](typeof value == "function" ? value : valueAccessor, contextOptions);
5201                                    } else if (ko.computedContext.getDependenciesCount()) {
5202                                        childContext = bindingContext['extend'](null, contextOptions);
5203                                    } else {
5204                                        childContext = bindingContext;
5205                                    }
5206                                }
5207
5208                                // Save a copy of the inner nodes on the initial update, but only if we have dependencies.
5209                                if (isInitial && ko.computedContext.getDependenciesCount()) {
5210                                    savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
5211                                }
5212
5213                                if (shouldDisplay) {
5214                                    if (!isInitial) {
5215                                        ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(savedNodes));
5216                                    }
5217
5218                                    ko.applyBindingsToDescendants(childContext, element);
5219                                } else {
5220                                    ko.virtualElements.emptyNode(element);
5221
5222                                    if (!completeOnRender) {
5223                                        ko.bindingEvent.notify(element, ko.bindingEvent.childrenComplete);
5224                                    }
5225                                }
5226
5227                                didDisplayOnLastUpdate = shouldDisplay;
5228
5229                            }, null, { disposeWhenNodeIsRemoved: element });
5230
5231                            return { 'controlsDescendantBindings': true };
5232                        }
5233                    };
5234                    ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings
5235                    ko.virtualElements.allowedBindings[bindingKey] = true;
5236                }
5237
5238                // Construct the actual binding handlers
5239                makeWithIfBinding('if');
5240                makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);
5241                makeWithIfBinding('with', true /* isWith */);
5242
5243            })(); ko.bindingHandlers['let'] = {
5244                'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
5245                    // Make a modified binding context, with extra properties, and apply it to descendant elements
5246                    var innerContext = bindingContext['extend'](valueAccessor);
5247                    ko.applyBindingsToDescendants(innerContext, element);
5248
5249                    return { 'controlsDescendantBindings': true };
5250                }
5251            };
5252            ko.virtualElements.allowedBindings['let'] = true;
5253            var captionPlaceholder = {};
5254            ko.bindingHandlers['options'] = {
5255                'init': function (element) {
5256                    if (ko.utils.tagNameLower(element) !== "select")
5257                        throw new Error("options binding applies only to SELECT elements");
5258
5259                    // Remove all existing <option>s.
5260                    while (element.length > 0) {
5261                        element.remove(0);
5262                    }
5263
5264                    // Ensures that the binding processor doesn't try to bind the options
5265                    return { 'controlsDescendantBindings': true };
5266                },
5267                'update': function (element, valueAccessor, allBindings) {
5268                    function selectedOptions() {
5269                        return ko.utils.arrayFilter(element.options, function (node) { return node.selected; });
5270                    }
5271
5272                    var selectWasPreviouslyEmpty = element.length == 0,
5273                        multiple = element.multiple,
5274                        previousScrollTop = (!selectWasPreviouslyEmpty && multiple) ? element.scrollTop : null,
5275                        unwrappedArray = ko.utils.unwrapObservable(valueAccessor()),
5276                        valueAllowUnset = allBindings.get('valueAllowUnset') && allBindings['has']('value'),
5277                        includeDestroyed = allBindings.get('optionsIncludeDestroyed'),
5278                        arrayToDomNodeChildrenOptions = {},
5279                        captionValue,
5280                        filteredArray,
5281                        previousSelectedValues = [];
5282
5283                    if (!valueAllowUnset) {
5284                        if (multiple) {
5285                            previousSelectedValues = ko.utils.arrayMap(selectedOptions(), ko.selectExtensions.readValue);
5286                        } else if (element.selectedIndex >= 0) {
5287                            previousSelectedValues.push(ko.selectExtensions.readValue(element.options[element.selectedIndex]));
5288                        }
5289                    }
5290
5291                    if (unwrappedArray) {
5292                        if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
5293                            unwrappedArray = [unwrappedArray];
5294
5295                        // Filter out any entries marked as destroyed
5296                        filteredArray = ko.utils.arrayFilter(unwrappedArray, function (item) {
5297                            return includeDestroyed || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
5298                        });
5299
5300                        // If caption is included, add it to the array
5301                        if (allBindings['has']('optionsCaption')) {
5302                            captionValue = ko.utils.unwrapObservable(allBindings.get('optionsCaption'));
5303                            // If caption value is null or undefined, don't show a caption
5304                            if (captionValue !== null && captionValue !== undefined) {
5305                                filteredArray.unshift(captionPlaceholder);
5306                            }
5307                        }
5308                    } else {
5309                        // If a falsy value is provided (e.g. null), we'll simply empty the select element
5310                    }
5311
5312                    function applyToObject(object, predicate, defaultValue) {
5313                        var predicateType = typeof predicate;
5314                        if (predicateType == "function")    // Given a function; run it against the data value
5315                            return predicate(object);
5316                        else if (predicateType == "string") // Given a string; treat it as a property name on the data value
5317                            return object[predicate];
5318                        else                                // Given no optionsText arg; use the data value itself
5319                            return defaultValue;
5320                    }
5321
5322                    // The following functions can run at two different times:
5323                    // The first is when the whole array is being updated directly from this binding handler.
5324                    // The second is when an observable value for a specific array entry is updated.
5325                    // oldOptions will be empty in the first case, but will be filled with the previously generated option in the second.
5326                    var itemUpdate = false;
5327                    function optionForArrayItem(arrayEntry, index, oldOptions) {
5328                        if (oldOptions.length) {
5329                            previousSelectedValues = !valueAllowUnset && oldOptions[0].selected ? [ko.selectExtensions.readValue(oldOptions[0])] : [];
5330                            itemUpdate = true;
5331                        }
5332                        var option = element.ownerDocument.createElement("option");
5333                        if (arrayEntry === captionPlaceholder) {
5334                            ko.utils.setTextContent(option, allBindings.get('optionsCaption'));
5335                            ko.selectExtensions.writeValue(option, undefined);
5336                        } else {
5337                            // Apply a value to the option element
5338                            var optionValue = applyToObject(arrayEntry, allBindings.get('optionsValue'), arrayEntry);
5339                            ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));
5340
5341                            // Apply some text to the option element
5342                            var optionText = applyToObject(arrayEntry, allBindings.get('optionsText'), optionValue);
5343                            ko.utils.setTextContent(option, optionText);
5344                        }
5345                        return [option];
5346                    }
5347
5348                    // By using a beforeRemove callback, we delay the removal until after new items are added. This fixes a selection
5349                    // problem in IE<=8 and Firefox. See https://github.com/knockout/knockout/issues/1208
5350                    arrayToDomNodeChildrenOptions['beforeRemove'] =
5351                        function (option) {
5352                            element.removeChild(option);
5353                        };
5354
5355                    function setSelectionCallback(arrayEntry, newOptions) {
5356                        if (itemUpdate && valueAllowUnset) {
5357                            // The model value is authoritative, so make sure its value is the one selected
5358                            ko.bindingEvent.notify(element, ko.bindingEvent.childrenComplete);
5359                        } else if (previousSelectedValues.length) {
5360                            // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
5361                            // That's why we first added them without selection. Now it's time to set the selection.
5362                            var isSelected = ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[0])) >= 0;
5363                            ko.utils.setOptionNodeSelectionState(newOptions[0], isSelected);
5364
5365                            // If this option was changed from being selected during a single-item update, notify the change
5366                            if (itemUpdate && !isSelected) {
5367                                ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
5368                            }
5369                        }
5370                    }
5371
5372                    var callback = setSelectionCallback;
5373                    if (allBindings['has']('optionsAfterRender') && typeof allBindings.get('optionsAfterRender') == "function") {
5374                        callback = function (arrayEntry, newOptions) {
5375                            setSelectionCallback(arrayEntry, newOptions);
5376                            ko.dependencyDetection.ignore(allBindings.get('optionsAfterRender'), null, [newOptions[0], arrayEntry !== captionPlaceholder ? arrayEntry : undefined]);
5377                        }
5378                    }
5379
5380                    ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, arrayToDomNodeChildrenOptions, callback);
5381
5382                    if (!valueAllowUnset) {
5383                        // Determine if the selection has changed as a result of updating the options list
5384                        var selectionChanged;
5385                        if (multiple) {
5386                            // For a multiple-select box, compare the new selection count to the previous one
5387                            // But if nothing was selected before, the selection can't have changed
5388                            selectionChanged = previousSelectedValues.length && selectedOptions().length < previousSelectedValues.length;
5389                        } else {
5390                            // For a single-select box, compare the current value to the previous value
5391                            // But if nothing was selected before or nothing is selected now, just look for a change in selection
5392                            selectionChanged = (previousSelectedValues.length && element.selectedIndex >= 0)
5393                                ? (ko.selectExtensions.readValue(element.options[element.selectedIndex]) !== previousSelectedValues[0])
5394                                : (previousSelectedValues.length || element.selectedIndex >= 0);
5395                        }
5396
5397                        // Ensure consistency between model value and selected option.
5398                        // If the dropdown was changed so that selection is no longer the same,
5399                        // notify the value or selectedOptions binding.
5400                        if (selectionChanged) {
5401                            ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
5402                        }
5403                    }
5404
5405                    if (valueAllowUnset || ko.computedContext.isInitial()) {
5406                        ko.bindingEvent.notify(element, ko.bindingEvent.childrenComplete);
5407                    }
5408
5409                    // Workaround for IE bug
5410                    ko.utils.ensureSelectElementIsRenderedCorrectly(element);
5411
5412                    if (previousScrollTop && Math.abs(previousScrollTop - element.scrollTop) > 20)
5413                        element.scrollTop = previousScrollTop;
5414                }
5415            };
5416            ko.bindingHandlers['options'].optionValueDomDataKey = ko.utils.domData.nextKey();
5417            ko.bindingHandlers['selectedOptions'] = {
5418                'init': function (element, valueAccessor, allBindings) {
5419                    function updateFromView() {
5420                        var value = valueAccessor(), valueToWrite = [];
5421                        ko.utils.arrayForEach(element.getElementsByTagName("option"), function (node) {
5422                            if (node.selected)
5423                                valueToWrite.push(ko.selectExtensions.readValue(node));
5424                        });
5425                        ko.expressionRewriting.writeValueToProperty(value, allBindings, 'selectedOptions', valueToWrite);
5426                    }
5427
5428                    function updateFromModel() {
5429                        var newValue = ko.utils.unwrapObservable(valueAccessor()),
5430                            previousScrollTop = element.scrollTop;
5431
5432                        if (newValue && typeof newValue.length == "number") {
5433                            ko.utils.arrayForEach(element.getElementsByTagName("option"), function (node) {
5434                                var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;
5435                                if (node.selected != isSelected) {      // This check prevents flashing of the select element in IE
5436                                    ko.utils.setOptionNodeSelectionState(node, isSelected);
5437                                }
5438                            });
5439                        }
5440
5441                        element.scrollTop = previousScrollTop;
5442                    }
5443
5444                    if (ko.utils.tagNameLower(element) != "select") {
5445                        throw new Error("selectedOptions binding applies only to SELECT elements");
5446                    }
5447
5448                    var updateFromModelComputed;
5449                    ko.bindingEvent.subscribe(element, ko.bindingEvent.childrenComplete, function () {
5450                        if (!updateFromModelComputed) {
5451                            ko.utils.registerEventHandler(element, "change", updateFromView);
5452                            updateFromModelComputed = ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });
5453                        } else {
5454                            updateFromView();
5455                        }
5456                    }, null, { 'notifyImmediately': true });
5457                },
5458                'update': function () { } // Keep for backwards compatibility with code that may have wrapped binding
5459            };
5460            ko.expressionRewriting.twoWayBindings['selectedOptions'] = true;
5461            ko.bindingHandlers['style'] = {
5462                'update': function (element, valueAccessor) {
5463                    var value = ko.utils.unwrapObservable(valueAccessor() || {});
5464                    ko.utils.objectForEach(value, function (styleName, styleValue) {
5465                        styleValue = ko.utils.unwrapObservable(styleValue);
5466
5467                        if (styleValue === null || styleValue === undefined || styleValue === false) {
5468                            // Empty string removes the value, whereas null/undefined have no effect
5469                            styleValue = "";
5470                        }
5471
5472                        if (jQueryInstance) {
5473                            jQueryInstance(element)['css'](styleName, styleValue);
5474                        } else if (/^--/.test(styleName)) {
5475                            // Is styleName a custom CSS property?
5476                            element.style.setProperty(styleName, styleValue);
5477                        } else {
5478                            styleName = styleName.replace(/-(\w)/g, function (all, letter) {
5479                                return letter.toUpperCase();
5480                            });
5481
5482                            var previousStyle = element.style[styleName];
5483                            element.style[styleName] = styleValue;
5484
5485                            if (styleValue !== previousStyle && element.style[styleName] == previousStyle && !isNaN(styleValue)) {
5486                                element.style[styleName] = styleValue + "px";
5487                            }
5488                        }
5489                    });
5490                }
5491            };
5492            ko.bindingHandlers['submit'] = {
5493                'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
5494                    if (typeof valueAccessor() != "function")
5495                        throw new Error("The value for a submit binding must be a function");
5496                    ko.utils.registerEventHandler(element, "submit", function (event) {
5497                        var handlerReturnValue;
5498                        var value = valueAccessor();
5499                        try { handlerReturnValue = value.call(bindingContext['$data'], element); }
5500                        finally {
5501                            if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
5502                                if (event.preventDefault)
5503                                    event.preventDefault();
5504                                else
5505                                    event.returnValue = false;
5506                            }
5507                        }
5508                    });
5509                }
5510            };
5511            ko.bindingHandlers['text'] = {
5512                'init': function () {
5513                    // Prevent binding on the dynamically-injected text node (as developers are unlikely to expect that, and it has security implications).
5514                    // It should also make things faster, as we no longer have to consider whether the text node might be bindable.
5515                    return { 'controlsDescendantBindings': true };
5516                },
5517                'update': function (element, valueAccessor) {
5518                    ko.utils.setTextContent(element, valueAccessor());
5519                }
5520            };
5521            ko.virtualElements.allowedBindings['text'] = true;
5522            (function () {
5523
5524                if (window && window.navigator) {
5525                    var parseVersion = function (matches) {
5526                        if (matches) {
5527                            return parseFloat(matches[1]);
5528                        }
5529                    };
5530
5531                    // Detect various browser versions because some old versions don't fully support the 'input' event
5532                    var userAgent = window.navigator.userAgent,
5533                        operaVersion, chromeVersion, safariVersion, firefoxVersion, ieVersion, edgeVersion;
5534
5535                    (operaVersion = window.opera && window.opera.version && parseInt(window.opera.version()))
5536                        || (edgeVersion = parseVersion(userAgent.match(/Edge\/([^ ]+)$/)))
5537                        || (chromeVersion = parseVersion(userAgent.match(/Chrome\/([^ ]+)/)))
5538                        || (safariVersion = parseVersion(userAgent.match(/Version\/([^ ]+) Safari/)))
5539                        || (firefoxVersion = parseVersion(userAgent.match(/Firefox\/([^ ]+)/)))
5540                        || (ieVersion = ko.utils.ieVersion || parseVersion(userAgent.match(/MSIE ([^ ]+)/)))      // Detects up to IE 10
5541                        || (ieVersion = parseVersion(userAgent.match(/rv:([^ )]+)/)));      // Detects IE 11
5542                }
5543
5544                // IE 8 and 9 have bugs that prevent the normal events from firing when the value changes.
5545                // But it does fire the 'selectionchange' event on many of those, presumably because the
5546                // cursor is moving and that counts as the selection changing. The 'selectionchange' event is
5547                // fired at the document level only and doesn't directly indicate which element changed. We
5548                // set up just one event handler for the document and use 'activeElement' to determine which
5549                // element was changed.
5550                if (ieVersion >= 8 && ieVersion < 10) {
5551                    var selectionChangeRegisteredName = ko.utils.domData.nextKey(),
5552                        selectionChangeHandlerName = ko.utils.domData.nextKey();
5553                    var selectionChangeHandler = function (event) {
5554                        var target = this.activeElement,
5555                            handler = target && ko.utils.domData.get(target, selectionChangeHandlerName);
5556                        if (handler) {
5557                            handler(event);
5558                        }
5559                    };
5560                    var registerForSelectionChangeEvent = function (element, handler) {
5561                        var ownerDoc = element.ownerDocument;
5562                        if (!ko.utils.domData.get(ownerDoc, selectionChangeRegisteredName)) {
5563                            ko.utils.domData.set(ownerDoc, selectionChangeRegisteredName, true);
5564                            ko.utils.registerEventHandler(ownerDoc, 'selectionchange', selectionChangeHandler);
5565                        }
5566                        ko.utils.domData.set(element, selectionChangeHandlerName, handler);
5567                    };
5568                }
5569
5570                ko.bindingHandlers['textInput'] = {
5571                    'init': function (element, valueAccessor, allBindings) {
5572
5573                        var previousElementValue = element.value,
5574                            timeoutHandle,
5575                            elementValueBeforeEvent;
5576
5577                        var updateModel = function (event) {
5578                            clearTimeout(timeoutHandle);
5579                            elementValueBeforeEvent = timeoutHandle = undefined;
5580
5581                            var elementValue = element.value;
5582                            if (previousElementValue !== elementValue) {
5583                                // Provide a way for tests to know exactly which event was processed
5584                                if (DEBUG && event) element['_ko_textInputProcessedEvent'] = event.type;
5585                                previousElementValue = elementValue;
5586                                ko.expressionRewriting.writeValueToProperty(valueAccessor(), allBindings, 'textInput', elementValue);
5587                            }
5588                        };
5589
5590                        var deferUpdateModel = function (event) {
5591                            if (!timeoutHandle) {
5592                                // The elementValueBeforeEvent variable is set *only* during the brief gap between an
5593                                // event firing and the updateModel function running. This allows us to ignore model
5594                                // updates that are from the previous state of the element, usually due to techniques
5595                                // such as rateLimit. Such updates, if not ignored, can cause keystrokes to be lost.
5596                                elementValueBeforeEvent = element.value;
5597                                var handler = DEBUG ? updateModel.bind(element, { type: event.type }) : updateModel;
5598                                timeoutHandle = ko.utils.setTimeout(handler, 4);
5599                            }
5600                        };
5601
5602                        // IE9 will mess up the DOM if you handle events synchronously which results in DOM changes (such as other bindings);
5603                        // so we'll make sure all updates are asynchronous
5604                        var ieUpdateModel = ko.utils.ieVersion == 9 ? deferUpdateModel : updateModel,
5605                            ourUpdate = false;
5606
5607                        var updateView = function () {
5608                            var modelValue = ko.utils.unwrapObservable(valueAccessor());
5609
5610                            if (modelValue === null || modelValue === undefined) {
5611                                modelValue = '';
5612                            }
5613
5614                            if (elementValueBeforeEvent !== undefined && modelValue === elementValueBeforeEvent) {
5615                                ko.utils.setTimeout(updateView, 4);
5616                                return;
5617                            }
5618
5619                            // Update the element only if the element and model are different. On some browsers, updating the value
5620                            // will move the cursor to the end of the input, which would be bad while the user is typing.
5621                            if (element.value !== modelValue) {
5622                                ourUpdate = true;  // Make sure we ignore events (propertychange) that result from updating the value
5623                                element.value = modelValue;
5624                                ourUpdate = false;
5625                                previousElementValue = element.value; // In case the browser changes the value (see #2281)
5626                            }
5627                        };
5628
5629                        var onEvent = function (event, handler) {
5630                            ko.utils.registerEventHandler(element, event, handler);
5631                        };
5632
5633                        if (DEBUG && ko.bindingHandlers['textInput']['_forceUpdateOn']) {
5634                            // Provide a way for tests to specify exactly which events are bound
5635                            ko.utils.arrayForEach(ko.bindingHandlers['textInput']['_forceUpdateOn'], function (eventName) {
5636                                if (eventName.slice(0, 5) == 'after') {
5637                                    onEvent(eventName.slice(5), deferUpdateModel);
5638                                } else {
5639                                    onEvent(eventName, updateModel);
5640                                }
5641                            });
5642                        } else {
5643                            if (ieVersion) {
5644                                // All versions (including 11) of Internet Explorer have a bug that they don't generate an input or propertychange event when ESC is pressed
5645                                onEvent('keypress', updateModel);
5646                            }
5647                            if (ieVersion < 11) {
5648                                // Internet Explorer <= 8 doesn't support the 'input' event, but does include 'propertychange' that fires whenever
5649                                // any property of an element changes. Unlike 'input', it also fires if a property is changed from JavaScript code,
5650                                // but that's an acceptable compromise for this binding. IE 9 and 10 support 'input', but since they don't always
5651                                // fire it when using autocomplete, we'll use 'propertychange' for them also.
5652                                onEvent('propertychange', function (event) {
5653                                    if (!ourUpdate && event.propertyName === 'value') {
5654                                        ieUpdateModel(event);
5655                                    }
5656                                });
5657                            }
5658                            if (ieVersion == 8) {
5659                                // IE 8 has a bug where it fails to fire 'propertychange' on the first update following a value change from
5660                                // JavaScript code. It also doesn't fire if you clear the entire value. To fix this, we bind to the following
5661                                // events too.
5662                                onEvent('keyup', updateModel);      // A single keystoke
5663                                onEvent('keydown', updateModel);    // The first character when a key is held down
5664                            }
5665                            if (registerForSelectionChangeEvent) {
5666                                // Internet Explorer 9 doesn't fire the 'input' event when deleting text, including using
5667                                // the backspace, delete, or ctrl-x keys, clicking the 'x' to clear the input, dragging text
5668                                // out of the field, and cutting or deleting text using the context menu. 'selectionchange'
5669                                // can detect all of those except dragging text out of the field, for which we use 'dragend'.
5670                                // These are also needed in IE8 because of the bug described above.
5671                                registerForSelectionChangeEvent(element, ieUpdateModel);  // 'selectionchange' covers cut, paste, drop, delete, etc.
5672                                onEvent('dragend', deferUpdateModel);
5673                            }
5674
5675                            if (!ieVersion || ieVersion >= 9) {
5676                                // All other supported browsers support the 'input' event, which fires whenever the content of the element is changed
5677                                // through the user interface.
5678                                onEvent('input', ieUpdateModel);
5679                            }
5680
5681                            if (safariVersion < 5 && ko.utils.tagNameLower(element) === "textarea") {
5682                                // Safari <5 doesn't fire the 'input' event for <textarea> elements (it does fire 'textInput'
5683                                // but only when typing). So we'll just catch as much as we can with keydown, cut, and paste.
5684                                onEvent('keydown', deferUpdateModel);
5685                                onEvent('paste', deferUpdateModel);
5686                                onEvent('cut', deferUpdateModel);
5687                            } else if (operaVersion < 11) {
5688                                // Opera 10 doesn't always fire the 'input' event for cut, paste, undo & drop operations.
5689                                // We can try to catch some of those using 'keydown'.
5690                                onEvent('keydown', deferUpdateModel);
5691                            } else if (firefoxVersion < 4.0) {
5692                                // Firefox <= 3.6 doesn't fire the 'input' event when text is filled in through autocomplete
5693                                onEvent('DOMAutoComplete', updateModel);
5694
5695                                // Firefox <=3.5 doesn't fire the 'input' event when text is dropped into the input.
5696                                onEvent('dragdrop', updateModel);       // <3.5
5697                                onEvent('drop', updateModel);           // 3.5
5698                            } else if (edgeVersion && element.type === "number") {
5699                                // Microsoft Edge doesn't fire 'input' or 'change' events for number inputs when
5700                                // the value is changed via the up / down arrow keys
5701                                onEvent('keydown', deferUpdateModel);
5702                            }
5703                        }
5704
5705                        // Bind to the change event so that we can catch programmatic updates of the value that fire this event.
5706                        onEvent('change', updateModel);
5707
5708                        // To deal with browsers that don't notify any kind of event for some changes (IE, Safari, etc.)
5709                        onEvent('blur', updateModel);
5710
5711                        ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
5712                    }
5713                };
5714                ko.expressionRewriting.twoWayBindings['textInput'] = true;
5715
5716                // textinput is an alias for textInput
5717                ko.bindingHandlers['textinput'] = {
5718                    // preprocess is the only way to set up a full alias
5719                    'preprocess': function (value, name, addBinding) {
5720                        addBinding('textInput', value);
5721                    }
5722                };
5723
5724            })(); ko.bindingHandlers['uniqueName'] = {
5725                'init': function (element, valueAccessor) {
5726                    if (valueAccessor()) {
5727                        var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
5728                        ko.utils.setElementName(element, name);
5729                    }
5730                }
5731            };
5732            ko.bindingHandlers['uniqueName'].currentIndex = 0;
5733            ko.bindingHandlers['using'] = {
5734                'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
5735                    var options;
5736
5737                    if (allBindings['has']('as')) {
5738                        options = { 'as': allBindings.get('as'), 'noChildContext': allBindings.get('noChildContext') };
5739                    }
5740
5741                    var innerContext = bindingContext['createChildContext'](valueAccessor, options);
5742                    ko.applyBindingsToDescendants(innerContext, element);
5743
5744                    return { 'controlsDescendantBindings': true };
5745                }
5746            };
5747            ko.virtualElements.allowedBindings['using'] = true;
5748            ko.bindingHandlers['value'] = {
5749                'init': function (element, valueAccessor, allBindings) {
5750                    var tagName = ko.utils.tagNameLower(element),
5751                        isInputElement = tagName == "input";
5752
5753                    // If the value binding is placed on a radio/checkbox, then just pass through to checkedValue and quit
5754                    if (isInputElement && (element.type == "checkbox" || element.type == "radio")) {
5755                        ko.applyBindingAccessorsToNode(element, { 'checkedValue': valueAccessor });
5756                        return;
5757                    }
5758
5759                    var eventsToCatch = [];
5760                    var requestedEventsToCatch = allBindings.get("valueUpdate");
5761                    var propertyChangedFired = false;
5762                    var elementValueBeforeEvent = null;
5763
5764                    if (requestedEventsToCatch) {
5765                        // Allow both individual event names, and arrays of event names
5766                        if (typeof requestedEventsToCatch == "string") {
5767                            eventsToCatch = [requestedEventsToCatch];
5768                        } else {
5769                            eventsToCatch = ko.utils.arrayGetDistinctValues(requestedEventsToCatch);
5770                        }
5771                        ko.utils.arrayRemoveItem(eventsToCatch, "change");  // We'll subscribe to "change" events later
5772                    }
5773
5774                    var valueUpdateHandler = function () {
5775                        elementValueBeforeEvent = null;
5776                        propertyChangedFired = false;
5777                        var modelValue = valueAccessor();
5778                        var elementValue = ko.selectExtensions.readValue(element);
5779                        ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'value', elementValue);
5780                    }
5781
5782                    // Workaround for https://github.com/SteveSanderson/knockout/issues/122
5783                    // IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
5784                    var ieAutoCompleteHackNeeded = ko.utils.ieVersion && isInputElement && element.type == "text"
5785                        && element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
5786                    if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
5787                        ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });
5788                        ko.utils.registerEventHandler(element, "focus", function () { propertyChangedFired = false });
5789                        ko.utils.registerEventHandler(element, "blur", function () {
5790                            if (propertyChangedFired) {
5791                                valueUpdateHandler();
5792                            }
5793                        });
5794                    }
5795
5796                    ko.utils.arrayForEach(eventsToCatch, function (eventName) {
5797                        // The syntax "after<eventname>" means "run the handler asynchronously after the event"
5798                        // This is useful, for example, to catch "keydown" events after the browser has updated the control
5799                        // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
5800                        var handler = valueUpdateHandler;
5801                        if (ko.utils.stringStartsWith(eventName, "after")) {
5802                            handler = function () {
5803                                // The elementValueBeforeEvent variable is non-null *only* during the brief gap between
5804                                // a keyX event firing and the valueUpdateHandler running, which is scheduled to happen
5805                                // at the earliest asynchronous opportunity. We store this temporary information so that
5806                                // if, between keyX and valueUpdateHandler, the underlying model value changes separately,
5807                                // we can overwrite that model value change with the value the user just typed. Otherwise,
5808                                // techniques like rateLimit can trigger model changes at critical moments that will
5809                                // override the user's inputs, causing keystrokes to be lost.
5810                                elementValueBeforeEvent = ko.selectExtensions.readValue(element);
5811                                ko.utils.setTimeout(valueUpdateHandler, 0);
5812                            };
5813                            eventName = eventName.substring("after".length);
5814                        }
5815                        ko.utils.registerEventHandler(element, eventName, handler);
5816                    });
5817
5818                    var updateFromModel;
5819
5820                    if (isInputElement && element.type == "file") {
5821                        // For file input elements, can only write the empty string
5822                        updateFromModel = function () {
5823                            var newValue = ko.utils.unwrapObservable(valueAccessor());
5824                            if (newValue === null || newValue === undefined || newValue === "") {
5825                                element.value = "";
5826                            } else {
5827                                ko.dependencyDetection.ignore(valueUpdateHandler);  // reset the model to match the element
5828                            }
5829                        }
5830                    } else {
5831                        updateFromModel = function () {
5832                            var newValue = ko.utils.unwrapObservable(valueAccessor());
5833                            var elementValue = ko.selectExtensions.readValue(element);
5834
5835                            if (elementValueBeforeEvent !== null && newValue === elementValueBeforeEvent) {
5836                                ko.utils.setTimeout(updateFromModel, 0);
5837                                return;
5838                            }
5839
5840                            var valueHasChanged = newValue !== elementValue;
5841
5842                            if (valueHasChanged || elementValue === undefined) {
5843                                if (tagName === "select") {
5844                                    var allowUnset = allBindings.get('valueAllowUnset');
5845                                    ko.selectExtensions.writeValue(element, newValue, allowUnset);
5846                                    if (!allowUnset && newValue !== ko.selectExtensions.readValue(element)) {
5847                                        // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
5848                                        // because you're not allowed to have a model value that disagrees with a visible UI selection.
5849                                        ko.dependencyDetection.ignore(valueUpdateHandler);
5850                                    }
5851                                } else {
5852                                    ko.selectExtensions.writeValue(element, newValue);
5853                                }
5854                            }
5855                        };
5856                    }
5857
5858                    if (tagName === "select") {
5859                        var updateFromModelComputed;
5860                        ko.bindingEvent.subscribe(element, ko.bindingEvent.childrenComplete, function () {
5861                            if (!updateFromModelComputed) {
5862                                ko.utils.registerEventHandler(element, "change", valueUpdateHandler);
5863                                updateFromModelComputed = ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });
5864                            } else if (allBindings.get('valueAllowUnset')) {
5865                                updateFromModel();
5866                            } else {
5867                                valueUpdateHandler();
5868                            }
5869                        }, null, { 'notifyImmediately': true });
5870                    } else {
5871                        ko.utils.registerEventHandler(element, "change", valueUpdateHandler);
5872                        ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });
5873                    }
5874                },
5875                'update': function () { } // Keep for backwards compatibility with code that may have wrapped value binding
5876            };
5877            ko.expressionRewriting.twoWayBindings['value'] = true;
5878            ko.bindingHandlers['visible'] = {
5879                'update': function (element, valueAccessor) {
5880                    var value = ko.utils.unwrapObservable(valueAccessor());
5881                    var isCurrentlyVisible = !(element.style.display == "none");
5882                    if (value && !isCurrentlyVisible)
5883                        element.style.display = "";
5884                    else if ((!value) && isCurrentlyVisible)
5885                        element.style.display = "none";
5886                }
5887            };
5888
5889            ko.bindingHandlers['hidden'] = {
5890                'update': function (element, valueAccessor) {
5891                    ko.bindingHandlers['visible']['update'](element, function () { return !ko.utils.unwrapObservable(valueAccessor()) });
5892                }
5893            };
5894            // 'click' is just a shorthand for the usual full-length event:{click:handler}
5895            makeEventHandlerShortcut('click');
5896            // If you want to make a custom template engine,
5897            //
5898            // [1] Inherit from this class (like ko.nativeTemplateEngine does)
5899            // [2] Override 'renderTemplateSource', supplying a function with this signature:
5900            //
5901            //        function (templateSource, bindingContext, options) {
5902            //            // - templateSource.text() is the text of the template you should render
5903            //            // - bindingContext.$data is the data you should pass into the template
5904            //            //   - you might also want to make bindingContext.$parent, bindingContext.$parents,
5905            //            //     and bindingContext.$root available in the template too
5906            //            // - options gives you access to any other properties set on "data-bind: { template: options }"
5907            //            // - templateDocument is the document object of the template
5908            //            //
5909            //            // Return value: an array of DOM nodes
5910            //        }
5911            //
5912            // [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
5913            //
5914            //        function (script) {
5915            //            // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
5916            //            //               For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
5917            //        }
5918            //
5919            //     This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
5920            //     If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
5921            //     and then you don't need to override 'createJavaScriptEvaluatorBlock'.
5922
5923            ko.templateEngine = function () { };
5924
5925            ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
5926                throw new Error("Override renderTemplateSource");
5927            };
5928
5929            ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
5930                throw new Error("Override createJavaScriptEvaluatorBlock");
5931            };
5932
5933            ko.templateEngine.prototype['makeTemplateSource'] = function (template, templateDocument) {
5934                // Named template
5935                if (typeof template == "string") {
5936                    templateDocument = templateDocument || document;
5937                    var elem = templateDocument.getElementById(template);
5938                    if (!elem)
5939                        throw new Error("Cannot find template with ID " + template);
5940                    return new ko.templateSources.domElement(elem);
5941                } else if ((template.nodeType == 1) || (template.nodeType == 8)) {
5942                    // Anonymous template
5943                    return new ko.templateSources.anonymousTemplate(template);
5944                } else
5945                    throw new Error("Unknown template type: " + template);
5946            };
5947
5948            ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {
5949                var templateSource = this['makeTemplateSource'](template, templateDocument);
5950                return this['renderTemplateSource'](templateSource, bindingContext, options, templateDocument);
5951            };
5952
5953            ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {
5954                // Skip rewriting if requested
5955                if (this['allowTemplateRewriting'] === false)
5956                    return true;
5957                return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
5958            };
5959
5960            ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {
5961                var templateSource = this['makeTemplateSource'](template, templateDocument);
5962                var rewritten = rewriterCallback(templateSource['text']());
5963                templateSource['text'](rewritten);
5964                templateSource['data']("isRewritten", true);
5965            };
5966
5967            ko.exportSymbol('templateEngine', ko.templateEngine);
5968
5969            ko.templateRewriting = (function () {
5970                var memoizeDataBindingAttributeSyntaxRegex = /(<([a-z]+\d*)(?:\s+(?!data-bind\s*=\s*)[a-z0-9\-]+(?:=(?:\"[^\"]*\"|\'[^\']*\'|[^>]*))?)*\s+)data-bind\s*=\s*(["'])([\s\S]*?)\3/gi;
5971                var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;
5972
5973                function validateDataBindValuesForRewriting(keyValueArray) {
5974                    var allValidators = ko.expressionRewriting.bindingRewriteValidators;
5975                    for (var i = 0; i < keyValueArray.length; i++) {
5976                        var key = keyValueArray[i]['key'];
5977                        if (Object.prototype.hasOwnProperty.call(allValidators, key)) {
5978                            var validator = allValidators[key];
5979
5980                            if (typeof validator === "function") {
5981                                var possibleErrorMessage = validator(keyValueArray[i]['value']);
5982                                if (possibleErrorMessage)
5983                                    throw new Error(possibleErrorMessage);
5984                            } else if (!validator) {
5985                                throw new Error("This template engine does not support the '" + key + "' binding within its templates");
5986                            }
5987                        }
5988                    }
5989                }
5990
5991                function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, nodeName, templateEngine) {
5992                    var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);
5993                    validateDataBindValuesForRewriting(dataBindKeyValueArray);
5994                    var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray, { 'valueAccessors': true });
5995
5996                    // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
5997                    // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
5998                    // extra indirection.
5999                    var applyBindingsToNextSiblingScript =
6000                        "ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()},'" + nodeName.toLowerCase() + "')";
6001                    return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
6002                }
6003
6004                return {
6005                    ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {
6006                        if (!templateEngine['isTemplateRewritten'](template, templateDocument))
6007                            templateEngine['rewriteTemplate'](template, function (htmlString) {
6008                                return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
6009                            }, templateDocument);
6010                    },
6011
6012                    memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
6013                        return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
6014                            return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[4], /* tagToRetain: */ arguments[1], /* nodeName: */ arguments[2], templateEngine);
6015                        }).replace(memoizeVirtualContainerBindingSyntaxRegex, function () {
6016                            return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", /* nodeName: */ "#comment", templateEngine);
6017                        });
6018                    },
6019
6020                    applyMemoizedBindingsToNextSibling: function (bindings, nodeName) {
6021                        return ko.memoization.memoize(function (domNode, bindingContext) {
6022                            var nodeToBind = domNode.nextSibling;
6023                            if (nodeToBind && nodeToBind.nodeName.toLowerCase() === nodeName) {
6024                                ko.applyBindingAccessorsToNode(nodeToBind, bindings, bindingContext);
6025                            }
6026                        });
6027                    }
6028                }
6029            })();
6030
6031
6032            // Exported only because it has to be referenced by string lookup from within rewritten template
6033            ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);
6034            (function () {
6035                // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
6036                // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
6037                //
6038                // Two are provided by default:
6039                //  1. ko.templateSources.domElement       - reads/writes the text content of an arbitrary DOM element
6040                //  2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
6041                //                                           without reading/writing the actual element text content, since it will be overwritten
6042                //                                           with the rendered template output.
6043                // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
6044                // Template sources need to have the following functions:
6045                //   text() 			- returns the template text from your storage location
6046                //   text(value)		- writes the supplied template text to your storage location
6047                //   data(key)			- reads values stored using data(key, value) - see below
6048                //   data(key, value)	- associates "value" with this template and the key "key". Is used to store information like "isRewritten".
6049                //
6050                // Optionally, template sources can also have the following functions:
6051                //   nodes()            - returns a DOM element containing the nodes of this template, where available
6052                //   nodes(value)       - writes the given DOM element to your storage location
6053                // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
6054                // for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
6055                //
6056                // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
6057                // using and overriding "makeTemplateSource" to return an instance of your custom template source.
6058
6059                ko.templateSources = {};
6060
6061                // ---- ko.templateSources.domElement -----
6062
6063                // template types
6064                var templateScript = 1,
6065                    templateTextArea = 2,
6066                    templateTemplate = 3,
6067                    templateElement = 4;
6068
6069                ko.templateSources.domElement = function (element) {
6070                    this.domElement = element;
6071
6072                    if (element) {
6073                        var tagNameLower = ko.utils.tagNameLower(element);
6074                        this.templateType =
6075                            tagNameLower === "script" ? templateScript :
6076                                tagNameLower === "textarea" ? templateTextArea :
6077                                    // For browsers with proper <template> element support, where the .content property gives a document fragment
6078                                    tagNameLower == "template" && element.content && element.content.nodeType === 11 ? templateTemplate :
6079                                        templateElement;
6080                    }
6081                }
6082
6083                ko.templateSources.domElement.prototype['text'] = function (/* valueToWrite */) {
6084                    var elemContentsProperty = this.templateType === templateScript ? "text"
6085                        : this.templateType === templateTextArea ? "value"
6086                            : "innerHTML";
6087
6088                    if (arguments.length == 0) {
6089                        return this.domElement[elemContentsProperty];
6090                    } else {
6091                        var valueToWrite = arguments[0];
6092                        if (elemContentsProperty === "innerHTML")
6093                            ko.utils.setHtml(this.domElement, valueToWrite);
6094                        else
6095                            this.domElement[elemContentsProperty] = valueToWrite;
6096                    }
6097                };
6098
6099                var dataDomDataPrefix = ko.utils.domData.nextKey() + "_";
6100                ko.templateSources.domElement.prototype['data'] = function (key /*, valueToWrite */) {
6101                    if (arguments.length === 1) {
6102                        return ko.utils.domData.get(this.domElement, dataDomDataPrefix + key);
6103                    } else {
6104                        ko.utils.domData.set(this.domElement, dataDomDataPrefix + key, arguments[1]);
6105                    }
6106                };
6107
6108                var templatesDomDataKey = ko.utils.domData.nextKey();
6109                function getTemplateDomData(element) {
6110                    return ko.utils.domData.get(element, templatesDomDataKey) || {};
6111                }
6112                function setTemplateDomData(element, data) {
6113                    ko.utils.domData.set(element, templatesDomDataKey, data);
6114                }
6115
6116                ko.templateSources.domElement.prototype['nodes'] = function (/* valueToWrite */) {
6117                    var element = this.domElement;
6118                    if (arguments.length == 0) {
6119                        var templateData = getTemplateDomData(element),
6120                            nodes = templateData.containerData || (
6121                                this.templateType === templateTemplate ? element.content :
6122                                    this.templateType === templateElement ? element :
6123                                        undefined);
6124                        if (!nodes || templateData.alwaysCheckText) {
6125                            // If the template is associated with an element that stores the template as text,
6126                            // parse and cache the nodes whenever there's new text content available. This allows
6127                            // the user to update the template content by updating the text of template node.
6128                            var text = this['text']();
6129                            if (text && text !== templateData.textData) {
6130                                nodes = ko.utils.parseHtmlForTemplateNodes(text, element.ownerDocument);
6131                                setTemplateDomData(element, { containerData: nodes, textData: text, alwaysCheckText: true });
6132                            }
6133                        }
6134                        return nodes;
6135                    } else {
6136                        var valueToWrite = arguments[0];
6137                        if (this.templateType !== undefined) {
6138                            this['text']("");   // clear the text from the node
6139                        }
6140                        setTemplateDomData(element, { containerData: valueToWrite });
6141                    }
6142                };
6143
6144                // ---- ko.templateSources.anonymousTemplate -----
6145                // Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
6146                // For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
6147                // Writing to "text" is still supported, but then the template data will not be available as DOM nodes.
6148
6149                ko.templateSources.anonymousTemplate = function (element) {
6150                    this.domElement = element;
6151                }
6152                ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
6153                ko.templateSources.anonymousTemplate.prototype.constructor = ko.templateSources.anonymousTemplate;
6154                ko.templateSources.anonymousTemplate.prototype['text'] = function (/* valueToWrite */) {
6155                    if (arguments.length == 0) {
6156                        var templateData = getTemplateDomData(this.domElement);
6157                        if (templateData.textData === undefined && templateData.containerData)
6158                            templateData.textData = templateData.containerData.innerHTML;
6159                        return templateData.textData;
6160                    } else {
6161                        var valueToWrite = arguments[0];
6162                        setTemplateDomData(this.domElement, { textData: valueToWrite });
6163                    }
6164                };
6165
6166                ko.exportSymbol('templateSources', ko.templateSources);
6167                ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
6168                ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
6169            })();
6170            (function () {
6171                var _templateEngine;
6172                ko.setTemplateEngine = function (templateEngine) {
6173                    if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
6174                        throw new Error("templateEngine must inherit from ko.templateEngine");
6175                    _templateEngine = templateEngine;
6176                }
6177
6178                function invokeForEachNodeInContinuousRange(firstNode, lastNode, action) {
6179                    var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
6180                    while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
6181                        nextInQueue = ko.virtualElements.nextSibling(node);
6182                        action(node, nextInQueue);
6183                    }
6184                }
6185
6186                function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
6187                    // To be used on any nodes that have been rendered by a template and have been inserted into some parent element
6188                    // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
6189                    // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
6190                    // (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
6191                    // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)
6192
6193                    if (continuousNodeArray.length) {
6194                        var firstNode = continuousNodeArray[0],
6195                            lastNode = continuousNodeArray[continuousNodeArray.length - 1],
6196                            parentNode = firstNode.parentNode,
6197                            provider = ko.bindingProvider['instance'],
6198                            preprocessNode = provider['preprocessNode'];
6199
6200                        if (preprocessNode) {
6201                            invokeForEachNodeInContinuousRange(firstNode, lastNode, function (node, nextNodeInRange) {
6202                                var nodePreviousSibling = node.previousSibling;
6203                                var newNodes = preprocessNode.call(provider, node);
6204                                if (newNodes) {
6205                                    if (node === firstNode)
6206                                        firstNode = newNodes[0] || nextNodeInRange;
6207                                    if (node === lastNode)
6208                                        lastNode = newNodes[newNodes.length - 1] || nodePreviousSibling;
6209                                }
6210                            });
6211
6212                            // Because preprocessNode can change the nodes, including the first and last nodes, update continuousNodeArray to match.
6213                            // We need the full set, including inner nodes, because the unmemoize step might remove the first node (and so the real
6214                            // first node needs to be in the array).
6215                            continuousNodeArray.length = 0;
6216                            if (!firstNode) { // preprocessNode might have removed all the nodes, in which case there's nothing left to do
6217                                return;
6218                            }
6219                            if (firstNode === lastNode) {
6220                                continuousNodeArray.push(firstNode);
6221                            } else {
6222                                continuousNodeArray.push(firstNode, lastNode);
6223                                ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
6224                            }
6225                        }
6226
6227                        // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
6228                        // whereas a regular applyBindings won't introduce new memoized nodes
6229                        invokeForEachNodeInContinuousRange(firstNode, lastNode, function (node) {
6230                            if (node.nodeType === 1 || node.nodeType === 8)
6231                                ko.applyBindings(bindingContext, node);
6232                        });
6233                        invokeForEachNodeInContinuousRange(firstNode, lastNode, function (node) {
6234                            if (node.nodeType === 1 || node.nodeType === 8)
6235                                ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
6236                        });
6237
6238                        // Make sure any changes done by applyBindings or unmemoize are reflected in the array
6239                        ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
6240                    }
6241                }
6242
6243                function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
6244                    return nodeOrNodeArray.nodeType ? nodeOrNodeArray
6245                        : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
6246                            : null;
6247                }
6248
6249                function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
6250                    options = options || {};
6251                    var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
6252                    var templateDocument = (firstTargetNode || template || {}).ownerDocument;
6253                    var templateEngineToUse = (options['templateEngine'] || _templateEngine);
6254                    ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
6255                    var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);
6256
6257                    // Loosely check result is an array of DOM nodes
6258                    if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
6259                        throw new Error("Template engine must return an array of DOM nodes");
6260
6261                    var haveAddedNodesToParent = false;
6262                    switch (renderMode) {
6263                        case "replaceChildren":
6264                            ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
6265                            haveAddedNodesToParent = true;
6266                            break;
6267                        case "replaceNode":
6268                            ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
6269                            haveAddedNodesToParent = true;
6270                            break;
6271                        case "ignoreTargetNode": break;
6272                        default:
6273                            throw new Error("Unknown renderMode: " + renderMode);
6274                    }
6275
6276                    if (haveAddedNodesToParent) {
6277                        activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
6278                        if (options['afterRender']) {
6279                            ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext[options['as'] || '$data']]);
6280                        }
6281                        if (renderMode == "replaceChildren") {
6282                            ko.bindingEvent.notify(targetNodeOrNodeArray, ko.bindingEvent.childrenComplete);
6283                        }
6284                    }
6285
6286                    return renderedNodesArray;
6287                }
6288
6289                function resolveTemplateName(template, data, context) {
6290                    // The template can be specified as:
6291                    if (ko.isObservable(template)) {
6292                        // 1. An observable, with string value
6293                        return template();
6294                    } else if (typeof template === 'function') {
6295                        // 2. A function of (data, context) returning a string
6296                        return template(data, context);
6297                    } else {
6298                        // 3. A string
6299                        return template;
6300                    }
6301                }
6302
6303                ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
6304                    options = options || {};
6305                    if ((options['templateEngine'] || _templateEngine) == undefined)
6306                        throw new Error("Set a template engine before calling renderTemplate");
6307                    renderMode = renderMode || "replaceChildren";
6308
6309                    if (targetNodeOrNodeArray) {
6310                        var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
6311
6312                        var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
6313                        var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;
6314
6315                        return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
6316                            function () {
6317                                // Ensure we've got a proper binding context to work with
6318                                var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
6319                                    ? dataOrBindingContext
6320                                    : new ko.bindingContext(dataOrBindingContext, null, null, null, { "exportDependencies": true });
6321
6322                                var templateName = resolveTemplateName(template, bindingContext['$data'], bindingContext),
6323                                    renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
6324
6325                                if (renderMode == "replaceNode") {
6326                                    targetNodeOrNodeArray = renderedNodesArray;
6327                                    firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
6328                                }
6329                            },
6330                            null,
6331                            { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
6332                        );
6333                    } else {
6334                        // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
6335                        return ko.memoization.memoize(function (domNode) {
6336                            ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
6337                        });
6338                    }
6339                };
6340
6341                ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
6342                    // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
6343                    // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
6344                    var arrayItemContext, asName = options['as'];
6345
6346                    // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
6347                    var executeTemplateForArrayItem = function (arrayValue, index) {
6348                        // Support selecting template as a function of the data being rendered
6349                        arrayItemContext = parentBindingContext['createChildContext'](arrayValue, {
6350                            'as': asName,
6351                            'noChildContext': options['noChildContext'],
6352                            'extend': function (context) {
6353                                context['$index'] = index;
6354                                if (asName) {
6355                                    context[asName + "Index"] = index;
6356                                }
6357                            }
6358                        });
6359
6360                        var templateName = resolveTemplateName(template, arrayValue, arrayItemContext);
6361                        return executeTemplate(targetNode, "ignoreTargetNode", templateName, arrayItemContext, options);
6362                    };
6363
6364                    // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
6365                    var activateBindingsCallback = function (arrayValue, addedNodesArray, index) {
6366                        activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
6367                        if (options['afterRender'])
6368                            options['afterRender'](addedNodesArray, arrayValue);
6369
6370                        // release the "cache" variable, so that it can be collected by
6371                        // the GC when its value isn't used from within the bindings anymore.
6372                        arrayItemContext = null;
6373                    };
6374
6375                    var setDomNodeChildrenFromArrayMapping = function (newArray, changeList) {
6376                        // Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).
6377                        // If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.
6378                        ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, newArray, executeTemplateForArrayItem, options, activateBindingsCallback, changeList]);
6379                        ko.bindingEvent.notify(targetNode, ko.bindingEvent.childrenComplete);
6380                    };
6381
6382                    var shouldHideDestroyed = (options['includeDestroyed'] === false) || (ko.options['foreachHidesDestroyed'] && !options['includeDestroyed']);
6383
6384                    if (!shouldHideDestroyed && !options['beforeRemove'] && ko.isObservableArray(arrayOrObservableArray)) {
6385                        setDomNodeChildrenFromArrayMapping(arrayOrObservableArray.peek());
6386
6387                        var subscription = arrayOrObservableArray.subscribe(function (changeList) {
6388                            setDomNodeChildrenFromArrayMapping(arrayOrObservableArray(), changeList);
6389                        }, null, "arrayChange");
6390                        subscription.disposeWhenNodeIsRemoved(targetNode);
6391
6392                        return subscription;
6393                    } else {
6394                        return ko.dependentObservable(function () {
6395                            var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
6396                            if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
6397                                unwrappedArray = [unwrappedArray];
6398
6399                            if (shouldHideDestroyed) {
6400                                // Filter out any entries marked as destroyed
6401                                unwrappedArray = ko.utils.arrayFilter(unwrappedArray, function (item) {
6402                                    return item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
6403                                });
6404                            }
6405                            setDomNodeChildrenFromArrayMapping(unwrappedArray);
6406
6407                        }, null, { disposeWhenNodeIsRemoved: targetNode });
6408                    }
6409                };
6410
6411                var templateComputedDomDataKey = ko.utils.domData.nextKey();
6412                function disposeOldComputedAndStoreNewOne(element, newComputed) {
6413                    var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
6414                    if (oldComputed && (typeof (oldComputed.dispose) == 'function'))
6415                        oldComputed.dispose();
6416                    ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && (!newComputed.isActive || newComputed.isActive())) ? newComputed : undefined);
6417                }
6418
6419                var cleanContainerDomDataKey = ko.utils.domData.nextKey();
6420                ko.bindingHandlers['template'] = {
6421                    'init': function (element, valueAccessor) {
6422                        // Support anonymous templates
6423                        var bindingValue = ko.utils.unwrapObservable(valueAccessor());
6424                        if (typeof bindingValue == "string" || 'name' in bindingValue) {
6425                            // It's a named template - clear the element
6426                            ko.virtualElements.emptyNode(element);
6427                        } else if ('nodes' in bindingValue) {
6428                            // We've been given an array of DOM nodes. Save them as the template source.
6429                            // There is no known use case for the node array being an observable array (if the output
6430                            // varies, put that behavior *into* your template - that's what templates are for), and
6431                            // the implementation would be a mess, so assert that it's not observable.
6432                            var nodes = bindingValue['nodes'] || [];
6433                            if (ko.isObservable(nodes)) {
6434                                throw new Error('The "nodes" option must be a plain, non-observable array.');
6435                            }
6436
6437                            // If the nodes are already attached to a KO-generated container, we reuse that container without moving the
6438                            // elements to a new one (we check only the first node, as the nodes are always moved together)
6439                            var container = nodes[0] && nodes[0].parentNode;
6440                            if (!container || !ko.utils.domData.get(container, cleanContainerDomDataKey)) {
6441                                container = ko.utils.moveCleanedNodesToContainerElement(nodes);
6442                                ko.utils.domData.set(container, cleanContainerDomDataKey, true);
6443                            }
6444
6445                            new ko.templateSources.anonymousTemplate(element)['nodes'](container);
6446                        } else {
6447                            // It's an anonymous template - store the element contents, then clear the element
6448                            var templateNodes = ko.virtualElements.childNodes(element);
6449                            if (templateNodes.length > 0) {
6450                                var container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
6451                                new ko.templateSources.anonymousTemplate(element)['nodes'](container);
6452                            } else {
6453                                throw new Error("Anonymous template defined, but no template content was provided");
6454                            }
6455                        }
6456                        return { 'controlsDescendantBindings': true };
6457                    },
6458                    'update': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
6459                        var value = valueAccessor(),
6460                            options = ko.utils.unwrapObservable(value),
6461                            shouldDisplay = true,
6462                            templateComputed = null,
6463                            template;
6464
6465                        if (typeof options == "string") {
6466                            template = value;
6467                            options = {};
6468                        } else {
6469                            template = 'name' in options ? options['name'] : element;
6470
6471                            // Support "if"/"ifnot" conditions
6472                            if ('if' in options)
6473                                shouldDisplay = ko.utils.unwrapObservable(options['if']);
6474                            if (shouldDisplay && 'ifnot' in options)
6475                                shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);
6476
6477                            // Don't show anything if an empty name is given (see #2446)
6478                            if (shouldDisplay && !template) {
6479                                shouldDisplay = false;
6480                            }
6481                        }
6482
6483                        if ('foreach' in options) {
6484                            // Render once for each data point (treating data set as empty if shouldDisplay==false)
6485                            var dataArray = (shouldDisplay && options['foreach']) || [];
6486                            templateComputed = ko.renderTemplateForEach(template, dataArray, options, element, bindingContext);
6487                        } else if (!shouldDisplay) {
6488                            ko.virtualElements.emptyNode(element);
6489                        } else {
6490                            // Render once for this single data point (or use the viewModel if no data was provided)
6491                            var innerBindingContext = bindingContext;
6492                            if ('data' in options) {
6493                                innerBindingContext = bindingContext['createChildContext'](options['data'], {
6494                                    'as': options['as'],
6495                                    'noChildContext': options['noChildContext'],
6496                                    'exportDependencies': true
6497                                });
6498                            }
6499                            templateComputed = ko.renderTemplate(template, innerBindingContext, options, element);
6500                        }
6501
6502                        // It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)
6503                        disposeOldComputedAndStoreNewOne(element, templateComputed);
6504                    }
6505                };
6506
6507                // Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
6508                ko.expressionRewriting.bindingRewriteValidators['template'] = function (bindingValue) {
6509                    var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);
6510
6511                    if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
6512                        return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)
6513
6514                    if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
6515                        return null; // Named templates can be rewritten, so return "no error"
6516                    return "This template engine does not support anonymous templates nested within its templates";
6517                };
6518
6519                ko.virtualElements.allowedBindings['template'] = true;
6520            })();
6521
6522            ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
6523            ko.exportSymbol('renderTemplate', ko.renderTemplate);
6524            // Go through the items that have been added and deleted and try to find matches between them.
6525            ko.utils.findMovesInArrayComparison = function (left, right, limitFailedCompares) {
6526                if (left.length && right.length) {
6527                    var failedCompares, l, r, leftItem, rightItem;
6528                    for (failedCompares = l = 0; (!limitFailedCompares || failedCompares < limitFailedCompares) && (leftItem = left[l]); ++l) {
6529                        for (r = 0; rightItem = right[r]; ++r) {
6530                            if (leftItem['value'] === rightItem['value']) {
6531                                leftItem['moved'] = rightItem['index'];
6532                                rightItem['moved'] = leftItem['index'];
6533                                right.splice(r, 1);         // This item is marked as moved; so remove it from right list
6534                                failedCompares = r = 0;     // Reset failed compares count because we're checking for consecutive failures
6535                                break;
6536                            }
6537                        }
6538                        failedCompares += r;
6539                    }
6540                }
6541            };
6542
6543            ko.utils.compareArrays = (function () {
6544                var statusNotInOld = 'added', statusNotInNew = 'deleted';
6545
6546                // Simple calculation based on Levenshtein distance.
6547                function compareArrays(oldArray, newArray, options) {
6548                    // For backward compatibility, if the third arg is actually a bool, interpret
6549                    // it as the old parameter 'dontLimitMoves'. Newer code should use { dontLimitMoves: true }.
6550                    options = (typeof options === 'boolean') ? { 'dontLimitMoves': options } : (options || {});
6551                    oldArray = oldArray || [];
6552                    newArray = newArray || [];
6553
6554                    if (oldArray.length < newArray.length)
6555                        return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, options);
6556                    else
6557                        return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, options);
6558                }
6559
6560                function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, options) {
6561                    var myMin = Math.min,
6562                        myMax = Math.max,
6563                        editDistanceMatrix = [],
6564                        smlIndex, smlIndexMax = smlArray.length,
6565                        bigIndex, bigIndexMax = bigArray.length,
6566                        compareRange = (bigIndexMax - smlIndexMax) || 1,
6567                        maxDistance = smlIndexMax + bigIndexMax + 1,
6568                        thisRow, lastRow,
6569                        bigIndexMaxForRow, bigIndexMinForRow;
6570
6571                    for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {
6572                        lastRow = thisRow;
6573                        editDistanceMatrix.push(thisRow = []);
6574                        bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);
6575                        bigIndexMinForRow = myMax(0, smlIndex - 1);
6576                        for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {
6577                            if (!bigIndex)
6578                                thisRow[bigIndex] = smlIndex + 1;
6579                            else if (!smlIndex)  // Top row - transform empty array into new array via additions
6580                                thisRow[bigIndex] = bigIndex + 1;
6581                            else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])
6582                                thisRow[bigIndex] = lastRow[bigIndex - 1];                  // copy value (no edit)
6583                            else {
6584                                var northDistance = lastRow[bigIndex] || maxDistance;       // not in big (deletion)
6585                                var westDistance = thisRow[bigIndex - 1] || maxDistance;    // not in small (addition)
6586                                thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;
6587                            }
6588                        }
6589                    }
6590
6591                    var editScript = [], meMinusOne, notInSml = [], notInBig = [];
6592                    for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {
6593                        meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;
6594                        if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex - 1]) {
6595                            notInSml.push(editScript[editScript.length] = {     // added
6596                                'status': statusNotInSml,
6597                                'value': bigArray[--bigIndex],
6598                                'index': bigIndex
6599                            });
6600                        } else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {
6601                            notInBig.push(editScript[editScript.length] = {     // deleted
6602                                'status': statusNotInBig,
6603                                'value': smlArray[--smlIndex],
6604                                'index': smlIndex
6605                            });
6606                        } else {
6607                            --bigIndex;
6608                            --smlIndex;
6609                            if (!options['sparse']) {
6610                                editScript.push({
6611                                    'status': "retained",
6612                                    'value': bigArray[bigIndex]
6613                                });
6614                            }
6615                        }
6616                    }
6617
6618                    // Set a limit on the number of consecutive non-matching comparisons; having it a multiple of
6619                    // smlIndexMax keeps the time complexity of this algorithm linear.
6620                    ko.utils.findMovesInArrayComparison(notInBig, notInSml, !options['dontLimitMoves'] && smlIndexMax * 10);
6621
6622                    return editScript.reverse();
6623                }
6624
6625                return compareArrays;
6626            })();
6627
6628            ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);
6629            (function () {
6630                // Objective:
6631                // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
6632                //   map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
6633                // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
6634                //   so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
6635                //   previously mapped - retain those nodes, and just insert/delete other ones
6636
6637                // "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
6638                // You can use this, for example, to activate bindings on those nodes.
6639
6640                function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
6641                    // Map this array value inside a dependentObservable so we re-map when any dependency changes
6642                    var mappedNodes = [];
6643                    var dependentObservable = ko.dependentObservable(function () {
6644                        var newMappedNodes = mapping(valueToMap, index, ko.utils.fixUpContinuousNodeArray(mappedNodes, containerNode)) || [];
6645
6646                        // On subsequent evaluations, just replace the previously-inserted DOM nodes
6647                        if (mappedNodes.length > 0) {
6648                            ko.utils.replaceDomNodes(mappedNodes, newMappedNodes);
6649                            if (callbackAfterAddingNodes)
6650                                ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);
6651                        }
6652
6653                        // Replace the contents of the mappedNodes array, thereby updating the record
6654                        // of which nodes would be deleted if valueToMap was itself later removed
6655                        mappedNodes.length = 0;
6656                        ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
6657                    }, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function () { return !ko.utils.anyDomNodeIsAttachedToDocument(mappedNodes); } });
6658                    return { mappedNodes: mappedNodes, dependentObservable: (dependentObservable.isActive() ? dependentObservable : undefined) };
6659                }
6660
6661                var lastMappingResultDomDataKey = ko.utils.domData.nextKey(),
6662                    deletedItemDummyValue = ko.utils.domData.nextKey();
6663
6664                ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes, editScript) {
6665                    array = array || [];
6666                    if (typeof array.length == "undefined") // Coerce single value into array
6667                        array = [array];
6668
6669                    options = options || {};
6670                    var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey);
6671                    var isFirstExecution = !lastMappingResult;
6672
6673                    // Build the new mapping result
6674                    var newMappingResult = [];
6675                    var lastMappingResultIndex = 0;
6676                    var currentArrayIndex = 0;
6677
6678                    var nodesToDelete = [];
6679                    var itemsToMoveFirstIndexes = [];
6680                    var itemsForBeforeRemoveCallbacks = [];
6681                    var itemsForMoveCallbacks = [];
6682                    var itemsForAfterAddCallbacks = [];
6683                    var mapData;
6684                    var countWaitingForRemove = 0;
6685
6686                    function itemAdded(value) {
6687                        mapData = { arrayEntry: value, indexObservable: ko.observable(currentArrayIndex++) };
6688                        newMappingResult.push(mapData);
6689                        if (!isFirstExecution) {
6690                            itemsForAfterAddCallbacks.push(mapData);
6691                        }
6692                    }
6693
6694                    function itemMovedOrRetained(oldPosition) {
6695                        mapData = lastMappingResult[oldPosition];
6696                        if (currentArrayIndex !== mapData.indexObservable.peek())
6697                            itemsForMoveCallbacks.push(mapData);
6698                        // Since updating the index might change the nodes, do so before calling fixUpContinuousNodeArray
6699                        mapData.indexObservable(currentArrayIndex++);
6700                        ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode);
6701                        newMappingResult.push(mapData);
6702                    }
6703
6704                    function callCallback(callback, items) {
6705                        if (callback) {
6706                            for (var i = 0, n = items.length; i < n; i++) {
6707                                ko.utils.arrayForEach(items[i].mappedNodes, function (node) {
6708                                    callback(node, i, items[i].arrayEntry);
6709                                });
6710                            }
6711                        }
6712                    }
6713
6714                    if (isFirstExecution) {
6715                        ko.utils.arrayForEach(array, itemAdded);
6716                    } else {
6717                        if (!editScript || (lastMappingResult && lastMappingResult['_countWaitingForRemove'])) {
6718                            // Compare the provided array against the previous one
6719                            var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; }),
6720                                compareOptions = {
6721                                    'dontLimitMoves': options['dontLimitMoves'],
6722                                    'sparse': true
6723                                };
6724                            editScript = ko.utils.compareArrays(lastArray, array, compareOptions);
6725                        }
6726
6727                        for (var i = 0, editScriptItem, movedIndex, itemIndex; editScriptItem = editScript[i]; i++) {
6728                            movedIndex = editScriptItem['moved'];
6729                            itemIndex = editScriptItem['index'];
6730                            switch (editScriptItem['status']) {
6731                                case "deleted":
6732                                    while (lastMappingResultIndex < itemIndex) {
6733                                        itemMovedOrRetained(lastMappingResultIndex++);
6734                                    }
6735                                    if (movedIndex === undefined) {
6736                                        mapData = lastMappingResult[lastMappingResultIndex];
6737
6738                                        // Stop tracking changes to the mapping for these nodes
6739                                        if (mapData.dependentObservable) {
6740                                            mapData.dependentObservable.dispose();
6741                                            mapData.dependentObservable = undefined;
6742                                        }
6743
6744                                        // Queue these nodes for later removal
6745                                        if (ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode).length) {
6746                                            if (options['beforeRemove']) {
6747                                                newMappingResult.push(mapData);
6748                                                countWaitingForRemove++;
6749                                                if (mapData.arrayEntry === deletedItemDummyValue) {
6750                                                    mapData = null;
6751                                                } else {
6752                                                    itemsForBeforeRemoveCallbacks.push(mapData);
6753                                                }
6754                                            }
6755                                            if (mapData) {
6756                                                nodesToDelete.push.apply(nodesToDelete, mapData.mappedNodes);
6757                                            }
6758                                        }
6759                                    }
6760                                    lastMappingResultIndex++;
6761                                    break;
6762
6763                                case "added":
6764                                    while (currentArrayIndex < itemIndex) {
6765                                        itemMovedOrRetained(lastMappingResultIndex++);
6766                                    }
6767                                    if (movedIndex !== undefined) {
6768                                        itemsToMoveFirstIndexes.push(newMappingResult.length);
6769                                        itemMovedOrRetained(movedIndex);
6770                                    } else {
6771                                        itemAdded(editScriptItem['value']);
6772                                    }
6773                                    break;
6774                            }
6775                        }
6776
6777                        while (currentArrayIndex < array.length) {
6778                            itemMovedOrRetained(lastMappingResultIndex++);
6779                        }
6780
6781                        // Record that the current view may still contain deleted items
6782                        // because it means we won't be able to use a provided editScript.
6783                        newMappingResult['_countWaitingForRemove'] = countWaitingForRemove;
6784                    }
6785
6786                    // Store a copy of the array items we just considered so we can difference it next time
6787                    ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
6788
6789                    // Call beforeMove first before any changes have been made to the DOM
6790                    callCallback(options['beforeMove'], itemsForMoveCallbacks);
6791
6792                    // Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)
6793                    ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);
6794
6795                    var i, j, lastNode, nodeToInsert, mappedNodes, activeElement;
6796
6797                    // Since most browsers remove the focus from an element when it's moved to another location,
6798                    // save the focused element and try to restore it later.
6799                    try {
6800                        activeElement = domNode.ownerDocument.activeElement;
6801                    } catch (e) {
6802                        // IE9 throws if you access activeElement during page load (see issue #703)
6803                    }
6804
6805                    // Try to reduce overall moved nodes by first moving the ones that were marked as moved by the edit script
6806                    if (itemsToMoveFirstIndexes.length) {
6807                        while ((i = itemsToMoveFirstIndexes.shift()) != undefined) {
6808                            mapData = newMappingResult[i];
6809                            for (lastNode = undefined; i;) {
6810                                if ((mappedNodes = newMappingResult[--i].mappedNodes) && mappedNodes.length) {
6811                                    lastNode = mappedNodes[mappedNodes.length - 1];
6812                                    break;
6813                                }
6814                            }
6815                            for (j = 0; nodeToInsert = mapData.mappedNodes[j]; lastNode = nodeToInsert, j++) {
6816                                ko.virtualElements.insertAfter(domNode, nodeToInsert, lastNode);
6817                            }
6818                        }
6819                    }
6820
6821                    // Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)
6822                    for (i = 0; mapData = newMappingResult[i]; i++) {
6823                        // Get nodes for newly added items
6824                        if (!mapData.mappedNodes)
6825                            ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));
6826
6827                        // Put nodes in the right place if they aren't there already
6828                        for (j = 0; nodeToInsert = mapData.mappedNodes[j]; lastNode = nodeToInsert, j++) {
6829                            ko.virtualElements.insertAfter(domNode, nodeToInsert, lastNode);
6830                        }
6831
6832                        // Run the callbacks for newly added nodes (for example, to apply bindings, etc.)
6833                        if (!mapData.initialized && callbackAfterAddingNodes) {
6834                            callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);
6835                            mapData.initialized = true;
6836                            lastNode = mapData.mappedNodes[mapData.mappedNodes.length - 1];     // get the last node again since it may have been changed by a preprocessor
6837                        }
6838                    }
6839
6840                    // Restore the focused element if it had lost focus
6841                    if (activeElement && domNode.ownerDocument.activeElement != activeElement) {
6842                        activeElement.focus();
6843                    }
6844
6845                    // If there's a beforeRemove callback, call it after reordering.
6846                    // Note that we assume that the beforeRemove callback will usually be used to remove the nodes using
6847                    // some sort of animation, which is why we first reorder the nodes that will be removed. If the
6848                    // callback instead removes the nodes right away, it would be more efficient to skip reordering them.
6849                    // Perhaps we'll make that change in the future if this scenario becomes more common.
6850                    callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);
6851
6852                    // Replace the stored values of deleted items with a dummy value. This provides two benefits: it marks this item
6853                    // as already "removed" so we won't call beforeRemove for it again, and it ensures that the item won't match up
6854                    // with an actual item in the array and appear as "retained" or "moved".
6855                    for (i = 0; i < itemsForBeforeRemoveCallbacks.length; ++i) {
6856                        itemsForBeforeRemoveCallbacks[i].arrayEntry = deletedItemDummyValue;
6857                    }
6858
6859                    // Finally call afterMove and afterAdd callbacks
6860                    callCallback(options['afterMove'], itemsForMoveCallbacks);
6861                    callCallback(options['afterAdd'], itemsForAfterAddCallbacks);
6862                }
6863            })();
6864
6865            ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
6866            ko.nativeTemplateEngine = function () {
6867                this['allowTemplateRewriting'] = false;
6868            }
6869
6870            ko.nativeTemplateEngine.prototype = new ko.templateEngine();
6871            ko.nativeTemplateEngine.prototype.constructor = ko.nativeTemplateEngine;
6872            ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
6873                var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
6874                    templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
6875                    templateNodes = templateNodesFunc ? templateSource['nodes']() : null;
6876
6877                if (templateNodes) {
6878                    return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
6879                } else {
6880                    var templateText = templateSource['text']();
6881                    return ko.utils.parseHtmlFragment(templateText, templateDocument);
6882                }
6883            };
6884
6885            ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
6886            ko.setTemplateEngine(ko.nativeTemplateEngine.instance);
6887
6888            ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
6889            (function () {
6890                ko.jqueryTmplTemplateEngine = function () {
6891                    // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
6892                    // doesn't expose a version number, so we have to infer it.
6893                    // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
6894                    // which KO internally refers to as version "2", so older versions are no longer detected.
6895                    var jQueryTmplVersion = this.jQueryTmplVersion = (function () {
6896                        if (!jQueryInstance || !(jQueryInstance['tmpl']))
6897                            return 0;
6898                        // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
6899                        try {
6900                            if (jQueryInstance['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
6901                                // Since 1.0.0pre, custom tags should append markup to an array called "__"
6902                                return 2; // Final version of jquery.tmpl
6903                            }
6904                        } catch (ex) { /* Apparently not the version we were looking for */ }
6905
6906                        return 1; // Any older version that we don't support
6907                    })();
6908
6909                    function ensureHasReferencedJQueryTemplates() {
6910                        if (jQueryTmplVersion < 2)
6911                            throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
6912                    }
6913
6914                    function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
6915                        return jQueryInstance['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
6916                    }
6917
6918                    this['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
6919                        templateDocument = templateDocument || document;
6920                        options = options || {};
6921                        ensureHasReferencedJQueryTemplates();
6922
6923                        // Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
6924                        var precompiled = templateSource['data']('precompiled');
6925                        if (!precompiled) {
6926                            var templateText = templateSource['text']() || "";
6927                            // Wrap in "with($whatever.koBindingContext) { ... }"
6928                            templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";
6929
6930                            precompiled = jQueryInstance['template'](null, templateText);
6931                            templateSource['data']('precompiled', precompiled);
6932                        }
6933
6934                        var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
6935                        var jQueryTemplateOptions = jQueryInstance['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
6936
6937                        var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
6938                        resultNodes['appendTo'](templateDocument.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
6939
6940                        jQueryInstance['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
6941                        return resultNodes;
6942                    };
6943