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https://nelsoncarvalheiro.com/wp-content/themes/uncode/library/js/lib/jquery.infinitescroll.js?ver=1315635708

js nelsoncarvalheiro.com collected 2026-09-25 00:11:02 UTC 39,024 bytes, 831 lines download raw bytes

1/*global jQuery: true */
2
3/*!
4   --------------------------------
5   Infinite Scroll
6   --------------------------------
7   + https://github.com/paulirish/infinite-scroll
8   + version 2.1.0
9   + Copyright 2011/12 Paul Irish & Luke Shumard
10   + Licensed under the MIT license
11
12   + Documentation: http://infinite-scroll.com/
13*/
14
15// Uses AMD or browser globals to create a jQuery plugin.
16(function (factory) {
17	if (typeof define === 'function' && define.amd) {
18		// AMD. Register as an anonymous module.
19		define(['jquery'], factory);
20	} else {
21		// Browser globals
22		factory(jQuery);
23	}
24}(function ($, undefined) {
25	'use strict';
26
27	$.infinitescroll = function infscr(options, callback, element) {
28		this.element = $(element);
29
30		// Flag the object in the event of a failed creation
31		if (!this._create(options, callback)) {
32			this.failed = true;
33		}
34	};
35
36	$.infinitescroll.defaults = {
37		loading: {
38			finished: undefined,
39			finishedMsg: "<em>Congratulations, you've reached the end of the internet.</em>",
40			img: 'data:image/gif;base64,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41			msg: null,
42			msgText: '<em>Loading the next set of posts...</em>',
43			selector: null,
44			speed: 'fast',
45			start: undefined
46		},
47		state: {
48			isDuringAjax: false,
49			isInvalidPage: false,
50			isDestroyed: false,
51			isDone: false, // For when it goes all the way through the archive.
52			isPaused: false,
53			isBeyondMaxPage: false,
54			currPage: 1
55		},
56		debug: false,
57		behavior: undefined,
58		binder: $(window), // used to cache the selector
59		nextSelector: 'div.navigation a:first',
60		navSelector: 'div.navigation',
61		contentSelector: null, // rename to pageFragment
62		extraScrollPx: 150,
63		itemSelector: 'div.post',
64		animate: false,
65		pathParse: undefined,
66		dataType: 'html',
67		appendCallback: true,
68		bufferPx: 40,
69		errorCallback: function () { },
70		infid: 0, //Instance ID
71		pixelsFromNavToBottom: undefined,
72		path: undefined, // Either parts of a URL as an array (e.g. ["/page/", "/"] or a function that takes in the page number and returns a URL
73		prefill: false, // When the document is smaller than the window, load data until the document is larger or links are exhausted
74		maxPage: undefined // to manually control maximum page (when maxPage is undefined, maximum page limitation is not work)
75	};
76
77	$.infinitescroll.prototype = {
78
79		/*
80			----------------------------
81			Private methods
82			----------------------------
83			*/
84
85		// Bind or unbind from scroll
86		_binding: function infscr_binding(binding) {
87
88			var instance = this,
89				opts = instance.options;
90
91			opts.v = '2.0b2.120520';
92
93			// if behavior is defined and this function is extended, call that instead of default
94			if (!!opts.behavior && this['_binding_' + opts.behavior] !== undefined) {
95				this['_binding_' + opts.behavior].call(this);
96				return;
97			}
98
99			if (binding !== 'bind' && binding !== 'unbind') {
100				this._debug('Binding value  ' + binding + ' not valid');
101				return false;
102			}
103
104			if (binding === 'unbind') {
105				(this.options.binder).unbind('smartscroll.infscr.' + instance.options.infid);
106			} else {
107				(this.options.binder)[binding]('smartscroll.infscr.' + instance.options.infid, function () {
108					instance.scroll();
109				});
110			}
111
112			this._debug('Binding', binding);
113		},
114
115		// Fundamental aspects of the plugin are initialized
116		_create: function infscr_create(options, callback) {
117
118			// Add custom options to defaults
119			var opts = $.extend(true, {}, $.infinitescroll.defaults, options);
120			this.options = opts;
121			var $window = $(window);
122			var instance = this;
123
124			// Validate selectors
125			if (!instance._validate(options)) {
126				return false;
127			}
128
129			// Validate page fragment path
130			var path = $(opts.nextSelector).attr('href');
131			if (!path) {
132				this._debug('Navigation selector not found');
133				return false;
134			}
135
136			// Set the path to be a relative URL from root.
137			opts.path = opts.path || this._determinepath(path);
138
139			// contentSelector is 'page fragment' option for .load() / .ajax() calls
140			opts.contentSelector = opts.contentSelector || this.element;
141
142			// loading.selector - if we want to place the load message in a specific selector, defaulted to the contentSelector
143			opts.loading.selector = opts.loading.selector || opts.contentSelector;
144
145			// Define loading.msg
146			opts.loading.msg = opts.loading.msg || $('<div id="infscr-loading"><img alt="Loading..." src="' + opts.loading.img + '" /><div>' + opts.loading.msgText + '</div></div>');
147
148			// Preload loading.img
149			(new Image()).src = opts.loading.img;
150
151			// distance from nav links to bottom
152			// computed as: height of the document + top offset of container - top offset of nav link
153			if (opts.pixelsFromNavToBottom === undefined) {
154				opts.pixelsFromNavToBottom = $(document).height() - $(opts.navSelector).offset().top;
155				this._debug('pixelsFromNavToBottom: ' + opts.pixelsFromNavToBottom);
156			}
157
158			var self = this;
159
160			// determine loading.start actions
161			opts.loading.start = opts.loading.start || function () {
162				$(opts.navSelector).hide();
163				opts.loading.msg
164					.appendTo(opts.loading.selector)
165					.show(opts.loading.speed, $.proxy(function () {
166						this.beginAjax(opts);
167					}, self));
168			};
169
170			// determine loading.finished actions
171			opts.loading.finished = opts.loading.finished || function () {
172				if (!opts.state.isBeyondMaxPage)
173					opts.loading.msg.fadeOut(opts.loading.speed);
174			};
175
176			// callback loading
177			opts.callback = function (instance, data, url) {
178				if (!!opts.behavior && instance['_callback_' + opts.behavior] !== undefined) {
179					instance['_callback_' + opts.behavior].call($(opts.contentSelector)[0], data, url);
180				}
181
182				if (callback) {
183					callback.call($(opts.contentSelector)[0], data, opts, url);
184				}
185
186				if (opts.prefill) {
187					$window.bind('resize.infinite-scroll', instance._prefill);
188				}
189			};
190
191			if (options.debug) {
192				// Tell IE9 to use its built-in console
193				if (Function.prototype.bind && (typeof console === 'object' || typeof console === 'function') && typeof console.log === 'object') {
194					['log', 'info', 'warn', 'error', 'assert', 'dir', 'clear', 'profile', 'profileEnd']
195						.forEach(function (method) {
196							console[method] = this.call(console[method], console);
197						}, Function.prototype.bind);
198				}
199			}
200
201			this._setup();
202
203			// Setups the prefill method for use
204			if (opts.prefill) {
205				this._prefill();
206			}
207
208			// Return true to indicate successful creation
209			return true;
210		},
211
212		_prefill: function infscr_prefill() {
213			var instance = this;
214			var $window = $(window);
215
216			function needsPrefill() {
217				return ($(instance.options.contentSelector).height() <= $window.height());
218			}
219
220			this._prefill = function () {
221				if (needsPrefill()) {
222					instance.scroll();
223				}
224
225				$window.bind('resize.infinite-scroll', function () {
226					if (needsPrefill()) {
227						$window.unbind('resize.infinite-scroll');
228						instance.scroll();
229					}
230				});
231			};
232
233			// Call self after setting up the new function
234			this._prefill();
235		},
236
237		// Console log wrapper
238		_debug: function infscr_debug() {
239			if (true !== this.options.debug) {
240				return;
241			}
242
243			if (typeof console !== 'undefined' && typeof console.log === 'function') {
244				// Modern browsers
245				// Single argument, which is a string
246				if ((Array.prototype.slice.call(arguments)).length === 1 && typeof Array.prototype.slice.call(arguments)[0] === 'string') {
247					console.log((Array.prototype.slice.call(arguments)).toString());
248				} else {
249					console.log(Array.prototype.slice.call(arguments));
250				}
251			} else if (!Function.prototype.bind && typeof console !== 'undefined' && typeof console.log === 'object') {
252				// IE8
253				Function.prototype.call.call(console.log, console, Array.prototype.slice.call(arguments));
254			}
255		},
256
257		// find the number to increment in the path.
258		_determinepath: function infscr_determinepath(path) {
259
260			var opts = this.options;
261
262			// if behavior is defined and this function is extended, call that instead of default
263			if (!!opts.behavior && this['_determinepath_' + opts.behavior] !== undefined) {
264				return this['_determinepath_' + opts.behavior].call(this, path);
265			}
266
267			var url = new URL(path);
268			var pathname = url.pathname;
269			var hasNumber = /\d/.test(pathname);
270
271			if (!!opts.pathParse) {
272				this._debug('pathParse manual');
273				return opts.pathParse(path, this.options.state.currPage + 1);
274            } else if (hasNumber && path.match(/(\?|\&)(upage=)(\d+)/)) {
275				var parts = path.split(/(\?|\&)(upage=)(\d+)/);
276				return [parts[0] + parts[1] + parts[2], parts[4]];
277            } else if (path.match(/^(.*?)\b2\b(.*?$)/)) {
278				path = path.match(/^(.*?)\b2\b(.*?$)/).slice(1);
279
280                // if there is any 2 in the url at all.
281            } else if (path.match(/^(.*?)2(.*?$)/)) {
282                // page= is used in django:
283                // http://www.infinite-scroll.com/changelog/comment-page-1/#comment-127
284                if (path.match(/^(.*?page=)2(\/.*|$)/)) {
285                    path = path.match(/^(.*?page=)2(\/.*|$)/).slice(1);
286                    return path;
287                }
288
289                path = path.match(/^(.*?)2(.*?$)/).slice(1);
290
291            } else {
292                // page= is used in drupal too but second page is page=1 not page=2:
293                // thx Jerod Fritz, vladikoff
294                if (path.match(/^(.*?page=)1(\/.*|$)/)) {
295                    path = path.match(/^(.*?page=)1(\/.*|$)/).slice(1);
296                    return path;
297                } else {
298                    this._debug("Sorry, we couldn't parse your Next (Previous Posts) URL. Verify your the css selector points to the correct A tag. If you still get this error: yell, scream, and kindly ask for help at infinite-scroll.com.");
299                    // Get rid of isInvalidPage to allow permalink to state
300                    opts.state.isInvalidPage = true;  //prevent it from running on this page.
301                }
302            }
303            this._debug('determinePath', path);
304            return path;
305
306        },
307
308        // Custom error
309        _error: function infscr_error(xhr) {
310
311            var opts = this.options;
312
313            // if behavior is defined and this function is extended, call that instead of default
314            if (!!opts.behavior && this['_error_'+opts.behavior] !== undefined) {
315                this['_error_'+opts.behavior].call(this,xhr);
316                return;
317            }
318
319            if (xhr !== 'destroy' && xhr !== 'end') {
320                xhr = 'unknown';
321            }
322
323            this._debug('Error', xhr);
324
325            if (xhr === 'end' || opts.state.isBeyondMaxPage) {
326                this._showdonemsg();
327            }
328
329            opts.state.isDone = true;
330            opts.state.currPage = 1; // if you need to go back to this instance
331            opts.state.isPaused = false;
332            opts.state.isBeyondMaxPage = false;
333            this._binding('unbind');
334
335        },
336
337        // Load Callback
338        _loadcallback: function infscr_loadcallback(box, data, url) {
339            var opts = this.options,
340            callback = this.options.callback, // GLOBAL OBJECT FOR CALLBACK
341            result = (opts.state.isDone) ? 'done' : (!opts.appendCallback) ? 'no-append' : 'append',
342            frag;
343
344            // if behavior is defined and this function is extended, call that instead of default
345            if (!!opts.behavior && this['_loadcallback_'+opts.behavior] !== undefined) {
346                this['_loadcallback_'+opts.behavior].call(this,box,data);
347                return;
348            }
349
350            switch (result) {
351                case 'done':
352                    this._showdonemsg();
353                    return false;
354
355                case 'no-append':
356                    if (opts.dataType === 'html') {
357                        data = '<div>' + data + '</div>';
358                        data = $(data).find(opts.itemSelector);
359                    }
360
361                    // if it didn't return anything
362                    if (data.length === 0) {
363                        return this._error('end');
364                    }
365
366                    break;
367
368                case 'append':
369                    var children = box.children();
370                    // if it didn't return anything
371                    if (children.length === 0) {
372                        return this._error('end');
373                    }
374
375                    // use a documentFragment because it works when content is going into a table or UL
376                    frag = document.createDocumentFragment();
377                    while (box[0].firstChild) {
378                        frag.appendChild(box[0].firstChild);
379                    }
380
381                    this._debug('contentSelector', $(opts.contentSelector)[0]);
382                    $(opts.contentSelector)[0].appendChild(frag);
383                    // previously, we would pass in the new DOM element as context for the callback
384                    // however we're now using a documentfragment, which doesn't have parents or children,
385                    // so the context is the contentContainer guy, and we pass in an array
386                    // of the elements collected as the first argument.
387
388                    data = children.get();
389                    break;
390            }
391
392            // loadingEnd function
393            opts.loading.finished.call($(opts.contentSelector)[0],opts);
394
395            // smooth scroll to ease in the new content
396            if (opts.animate) {
397                var scrollTo = $(window).scrollTop() + $(opts.loading.msg).height() + opts.extraScrollPx + 'px';
398                $('html,body').animate({ scrollTop: scrollTo }, 800, function () { opts.state.isDuringAjax = false; });
399            }
400
401            if (!opts.animate) {
402                // once the call is done, we can allow it again.
403                opts.state.isDuringAjax = false;
404            }
405
406            callback(this, data, url);
407
408            if (opts.prefill) {
409                this._prefill();
410            }
411        },
412
413        _nearbottom: function infscr_nearbottom() {
414
415            var opts = this.options,
416            pixelsFromWindowBottomToBottom = 0 + $(document).height() - (opts.binder.scrollTop()) - $(window).height();
417
418            // if behavior is defined and this function is extended, call that instead of default
419            if (!!opts.behavior && this['_nearbottom_'+opts.behavior] !== undefined) {
420                return this['_nearbottom_'+opts.behavior].call(this);
421            }
422
423            this._debug('math:', pixelsFromWindowBottomToBottom, opts.pixelsFromNavToBottom);
424
425            // if distance remaining in the scroll (including buffer) is less than the orignal nav to bottom....
426            return (pixelsFromWindowBottomToBottom - opts.bufferPx < opts.pixelsFromNavToBottom);
427
428        },
429
430        // Pause / temporarily disable plugin from firing
431        _pausing: function infscr_pausing(pause) {
432
433            var opts = this.options;
434
435            // if behavior is defined and this function is extended, call that instead of default
436            if (!!opts.behavior && this['_pausing_'+opts.behavior] !== undefined) {
437                this['_pausing_'+opts.behavior].call(this,pause);
438                return;
439            }
440
441            // If pause is not 'pause' or 'resume', toggle it's value
442            if (pause !== 'pause' && pause !== 'resume' && pause !== null) {
443                this._debug('Invalid argument. Toggling pause value instead');
444            }
445
446            pause = (pause && (pause === 'pause' || pause === 'resume')) ? pause : 'toggle';
447
448            switch (pause) {
449                case 'pause':
450                    opts.state.isPaused = true;
451                break;
452
453                case 'resume':
454                    opts.state.isPaused = false;
455                break;
456
457                case 'toggle':
458                    opts.state.isPaused = !opts.state.isPaused;
459                break;
460            }
461
462            this._debug('Paused', opts.state.isPaused);
463            return false;
464
465        },
466
467        // Behavior is determined
468        // If the behavior option is undefined, it will set to default and bind to scroll
469        _setup: function infscr_setup() {
470
471            var opts = this.options;
472
473            // if behavior is defined and this function is extended, call that instead of default
474            if (!!opts.behavior && this['_setup_'+opts.behavior] !== undefined) {
475                this['_setup_'+opts.behavior].call(this);
476                return;
477            }
478
479            this._binding('bind');
480
481            return false;
482
483        },
484
485        // Show done message
486        _showdonemsg: function infscr_showdonemsg() {
487
488            var opts = this.options;
489
490            // if behavior is defined and this function is extended, call that instead of default
491            if (!!opts.behavior && this['_showdonemsg_'+opts.behavior] !== undefined) {
492                this['_showdonemsg_'+opts.behavior].call(this);
493                return;
494            }
495
496            opts.loading.msg
497            .find('img')
498            .hide()
499            .parent()
500            .find('div').html(opts.loading.finishedMsg).animate({ opacity: 1 }, 2000, function () {
501                $(this).parent().fadeOut(opts.loading.speed);
502            });
503
504            // user provided callback when done
505            opts.errorCallback.call($(opts.contentSelector)[0],'done');
506        },
507
508        // grab each selector option and see if any fail
509        _validate: function infscr_validate(opts) {
510            for (var key in opts) {
511                if (key.indexOf && key.indexOf('Selector') > -1 && $(opts[key]).length === 0) {
512                    this._debug('Your ' + key + ' found no elements.');
513                    return false;
514                }
515            }
516
517            return true;
518        },
519
520        /*
521            ----------------------------
522            Public methods
523            ----------------------------
524            */
525
526        // Bind to scroll
527        bind: function infscr_bind() {
528            this._binding('bind');
529        },
530
531        // Destroy current instance of plugin
532        destroy: function infscr_destroy() {
533            this.options.state.isDestroyed = true;
534            this.options.loading.finished();
535            return this._error('destroy');
536        },
537
538        // Set pause value to false
539        pause: function infscr_pause() {
540            this._pausing('pause');
541        },
542
543        // Set pause value to false
544        resume: function infscr_resume() {
545            this._pausing('resume');
546        },
547
548        beginAjax: function infscr_ajax(opts) {
549            var instance = this,
550                path = opts.path,
551                box, desturl, method, condition;
552
553			// increment the URL bit. e.g. /page/3/
554            opts.state.currPage++;
555
556            // Manually control maximum page
557            if ( opts.maxPage !== undefined && opts.state.currPage > opts.maxPage ){
558                opts.state.isBeyondMaxPage = true;
559                this.destroy();
560                return;
561            }
562
563            // if we're dealing with a table we can't use DIVs
564            box = $(opts.contentSelector).is('table, tbody') ? $('<tbody/>') : $('<div/>');
565
566			desturl = (typeof path === 'function') ? path(opts.state.currPage) : path.join(opts.state.currPage);
567
568            instance._debug('heading into ajax', desturl);
569
570            method = (opts.dataType === 'html' || opts.dataType === 'json' ) ? opts.dataType : 'html+callback';
571            if (opts.appendCallback && opts.dataType === 'html') {
572                method += '+callback';
573            }
574
575            switch (method) {
576                case 'html+callback':
577                    instance._debug('Using HTML via .load() method');
578                    box.load(desturl + ' ' + opts.itemSelector, undefined, function infscr_ajax_callback(responseText) {
579                        instance._loadcallback(box, responseText, desturl);
580                    });
581
582                    break;
583
584                case 'html':
585                    instance._debug('Using ' + (method.toUpperCase()) + ' via $.ajax() method');
586                    $.ajax({
587                        // params
588                        url: desturl,
589                        dataType: opts.dataType,
590                        complete: function infscr_ajax_callback(jqXHR, textStatus) {
591                            condition = (typeof (jqXHR.isResolved) !== 'undefined') ? (jqXHR.isResolved()) : (textStatus === 'success' || textStatus === 'notmodified');
592                            if (condition) {
593                                instance._loadcallback(box, jqXHR.responseText, desturl);
594                            } else {
595                                instance._error('end');
596                            }
597                        }
598                    });
599
600                    break;
601                case 'json':
602                    instance._debug('Using ' + (method.toUpperCase()) + ' via $.ajax() method');
603                    $.ajax({
604                        dataType: 'json',
605                        type: 'GET',
606                        url: desturl,
607                        success: function (data, textStatus, jqXHR) {
608                            condition = (typeof (jqXHR.isResolved) !== 'undefined') ? (jqXHR.isResolved()) : (textStatus === 'success' || textStatus === 'notmodified');
609                            if (opts.appendCallback) {
610                                // if appendCallback is true, you must defined template in options.
611                                // note that data passed into _loadcallback is already an html (after processed in opts.template(data)).
612                                if (opts.template !== undefined) {
613                                    var theData = opts.template(data);
614                                    box.append(theData);
615                                    if (condition) {
616                                        instance._loadcallback(box, theData);
617                                    } else {
618                                        instance._error('end');
619                                    }
620                                } else {
621                                    instance._debug('template must be defined.');
622                                    instance._error('end');
623                                }
624                            } else {
625                                // if appendCallback is false, we will pass in the JSON object. you should handle it yourself in your callback.
626                                if (condition) {
627                                    instance._loadcallback(box, data, desturl);
628                                } else {
629                                    instance._error('end');
630                                }
631                            }
632                        },
633                        error: function() {
634                            instance._debug('JSON ajax request failed.');
635                            instance._error('end');
636                        }
637                    });
638
639                    break;
640            }
641        },
642
643        // Retrieve next set of content items
644        retrieve: function infscr_retrieve(pageNum) {
645            pageNum = pageNum || null;
646
647            var instance = this,
648            opts = instance.options;
649
650            // if behavior is defined and this function is extended, call that instead of default
651            if (!!opts.behavior && this['retrieve_'+opts.behavior] !== undefined) {
652                this['retrieve_'+opts.behavior].call(this,pageNum);
653                return;
654            }
655
656            // for manual triggers, if destroyed, get out of here
657            if (opts.state.isDestroyed) {
658                this._debug('Instance is destroyed');
659                return false;
660            }
661
662            // we dont want to fire the ajax multiple times
663            opts.state.isDuringAjax = true;
664
665            opts.loading.start.call($(opts.contentSelector)[0],opts);
666        },
667
668        // Check to see next page is needed
669        scroll: function infscr_scroll() {
670
671            var opts = this.options,
672            state = opts.state;
673
674            // if behavior is defined and this function is extended, call that instead of default
675            if (!!opts.behavior && this['scroll_'+opts.behavior] !== undefined) {
676                this['scroll_'+opts.behavior].call(this);
677                return;
678            }
679
680            if (state.isDuringAjax || state.isInvalidPage || state.isDone || state.isDestroyed || state.isPaused) {
681                return;
682            }
683
684            if (!this._nearbottom()) {
685                return;
686            }
687
688            this.retrieve();
689
690        },
691
692        // Toggle pause value
693        toggle: function infscr_toggle() {
694            this._pausing();
695        },
696
697        // Unbind from scroll
698        unbind: function infscr_unbind() {
699            this._binding('unbind');
700        },
701
702        // update options
703        update: function infscr_options(key) {
704            if ($.isPlainObject(key)) {
705                this.options = $.extend(true,this.options,key);
706            }
707        }
708    };
709
710
711    /*
712        ----------------------------
713        Infinite Scroll function
714        ----------------------------
715
716        Borrowed logic from the following...
717
718        jQuery UI
719        - https://github.com/jquery/jquery-ui/blob/master/ui/jquery.ui.widget.js
720
721        jCarousel
722        - https://github.com/jsor/jcarousel/blob/master/lib/jquery.jcarousel.js
723
724        Masonry
725        - https://github.com/desandro/masonry/blob/master/jquery.masonry.js
726
727*/
728
729    $.fn.infinitescroll = function infscr_init(options, callback) {
730
731
732        var thisCall = typeof options;
733
734        switch (thisCall) {
735
736            // method
737            case 'string':
738                var args = Array.prototype.slice.call(arguments, 1);
739
740                this.each(function () {
741                    var instance = $.data(this, 'infinitescroll');
742
743                    if (!instance) {
744                        // not setup yet
745                        // return $.error('Method ' + options + ' cannot be called until Infinite Scroll is setup');
746                        return false;
747                    }
748
749                    if (!$.isFunction(instance[options]) || options.charAt(0) === '_') {
750                        // return $.error('No such method ' + options + ' for Infinite Scroll');
751                        return false;
752                    }
753
754                    // no errors!
755                    instance[options].apply(instance, args);
756                });
757
758            break;
759
760            // creation
761            case 'object':
762
763                this.each(function () {
764
765                var instance = $.data(this, 'infinitescroll');
766
767                if (instance) {
768
769                    // update options of current instance
770                    instance.update(options);
771
772                } else {
773
774                    // initialize new instance
775                    instance = new $.infinitescroll(options, callback, this);
776
777                    // don't attach if instantiation failed
778                    if (!instance.failed) {
779                        $.data(this, 'infinitescroll', instance);
780                    }
781
782                }
783
784            });
785
786            break;
787
788        }
789
790        return this;
791    };
792
793
794
795    /*
796     * smartscroll: debounced scroll event for jQuery *
797     * https://github.com/lukeshumard/smartscroll
798     * Based on smartresize by @louis_remi: https://github.com/lrbabe/jquery.smartresize.js *
799     * Copyright 2011 Louis-Remi & Luke Shumard * Licensed under the MIT license. *
800     */
801
802    var event = $.event,
803    scrollTimeout;
804
805    event.special.smartscroll = {
806        setup: function () {
807            $(this).bind('scroll', event.special.smartscroll.handler);
808        },
809        teardown: function () {
810            $(this).unbind('scroll', event.special.smartscroll.handler);
811        },
812        handler: function (event, execAsap) {
813            // Save the context
814            var context = this,
815            args = arguments;
816
817            // set correct event type
818            event.type = 'smartscroll';
819
820            if (scrollTimeout) { clearTimeout(scrollTimeout); }
821            scrollTimeout = setTimeout(function () {
822                $(context).trigger('smartscroll', args);
823            }, execAsap === 'execAsap' ? 0 : 100);
824        }
825    };
826
827    $.fn.smartscroll = function (fn) {
828        return fn ? this.bind('smartscroll', fn) : this.trigger('smartscroll', ['execAsap']);
829    };
830
831}));

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