1/*jshint undef: true */ 2/*global jQuery: true */ 3 4/* 5 -------------------------------- 6 Infinite Scroll 7 -------------------------------- 8 + https://github.com/paulirish/infinite-scroll 9 + version 2.0b2.120519 10 + Copyright 2011/12 Paul Irish & Luke Shumard 11 + Licensed under the MIT license 12 13 + Documentation: http://infinite-scroll.com/ 14*/ 15 16(function (window, $, undefined) { 17 "use strict"; 18 19 $.infinitescroll = function infscr(options, callback, element) { 20 this.element = $(element); 21 22 // Flag the object in the event of a failed creation 23 if (!this._create(options, callback)) { 24 this.failed = true; 25 } 26 }; 27 28 $.infinitescroll.defaults = { 29 loading: { 30 finished: undefined, 31 finishedMsg: "<em>Congratulations, you've reached the end of the internet.</em>", 32 img: "data:image/gif;base64,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42 isDestroyed: false, 43 isDone: false, // For when it goes all the way through the archive. 44 isPaused: false, 45 currPage: 1 46 }, 47 debug: false, 48 behavior: undefined, 49 binder: $(window), // used to cache the selector 50 nextSelector: "div.navigation a:first", 51 navSelector: "div.navigation", 52 contentSelector: null, // rename to pageFragment 53 extraScrollPx: 150, 54 itemSelector: "div.post", 55 animate: false, 56 pathParse: undefined, 57 dataType: 'html', 58 appendCallback: true, 59 bufferPx: 40, 60 errorCallback: function () { }, 61 infid: 0, //Instance ID 62 pixelsFromNavToBottom: undefined, 63 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 64 prefill: false, // When the document is smaller than the window, load data until the document is larger or links are exhausted 65 maxPage: undefined // to manually control maximum page (when maxPage is undefined, maximum page limitation is not work) 66 }; 67 68 $.infinitescroll.prototype = { 69 70 /* 71 ---------------------------- 72 Private methods 73 ---------------------------- 74 */ 75 76 // Bind or unbind from scroll 77 _binding: function infscr_binding(binding) { 78 79 var instance = this, 80 opts = instance.options; 81 82 opts.v = '2.0b2.120520'; 83 84 // if behavior is defined and this function is extended, call that instead of default 85 if (!!opts.behavior && this['_binding_'+opts.behavior] !== undefined) { 86 this['_binding_'+opts.behavior].call(this); 87 return; 88 } 89 90 if (binding !== 'bind' && binding !== 'unbind') { 91 this._debug('Binding value ' + binding + ' not valid'); 92 return false; 93 } 94 95 if (binding === 'unbind') { 96 (this.options.binder).unbind('smartscroll.infscr.' + instance.options.infid); 97 } else { 98 (this.options.binder)[binding]('smartscroll.infscr.' + instance.options.infid, function () { 99 instance.scroll(); 100 }); 101 } 102 103 this._debug('Binding', binding); 104 }, 105 106 // Fundamental aspects of the plugin are initialized 107 _create: function infscr_create(options, callback) { 108 109 // Add custom options to defaults 110 var opts = $.extend(true, {}, $.infinitescroll.defaults, options); 111 this.options = opts; 112 var $window = $(window); 113 var instance = this; 114 115 // Validate selectors 116 if (!instance._validate(options)) { 117 return false; 118 } 119 120 // Validate page fragment path 121 var path = $(opts.nextSelector).attr('href'); 122 if (!path) { 123 this._debug('Navigation selector not found'); 124 return false; 125 } 126 127 // Set the path to be a relative URL from root. 128 opts.path = opts.path || this._determinepath(path); 129 130 // contentSelector is 'page fragment' option for .load() / .ajax() calls 131 opts.contentSelector = opts.contentSelector || this.element; 132 133 // loading.selector - if we want to place the load message in a specific selector, defaulted to the contentSelector 134 opts.loading.selector = opts.loading.selector || opts.contentSelector; 135 136 // Define loading.msg 137 opts.loading.msg = opts.loading.msg || $('<div id="infscr-loading"><img alt="Loading..." src="' + opts.loading.img + '" /><div>' + opts.loading.msgText + '</div></div>'); 138 139 // Preload loading.img 140 (new Image()).src = opts.loading.img; 141 142 // distance from nav links to bottom 143 // computed as: height of the document + top offset of container - top offset of nav link 144 if(opts.pixelsFromNavToBottom === undefined) { 145 $(opts.navSelector).show(); 146 this._debug( opts.navSelector + '-->' + $(opts.navSelector).offset().top ); 147 opts.pixelsFromNavToBottom = $(document).height() - $(opts.navSelector).offset().top; 148 $(opts.navSelector).hide(); 149 } 150 151 var self = this; 152 153 // determine loading.start actions 154 opts.loading.start = opts.loading.start || function() { 155 $(opts.navSelector).hide(); 156 opts.loading.msg 157 .appendTo(opts.loading.selector) 158 .show(opts.loading.speed, $.proxy(function() { 159 this.beginAjax(opts); 160 }, self)); 161 }; 162 163 // determine loading.finished actions 164 opts.loading.finished = opts.loading.finished || function() { 165 opts.loading.msg.fadeOut(opts.loading.speed); 166 }; 167 168 // callback loading 169 opts.callback = function(instance, data, url) { 170 if (!!opts.behavior && instance['_callback_'+opts.behavior] !== undefined) { 171 instance['_callback_'+opts.behavior].call($(opts.contentSelector)[0], data, url); 172 } 173 174 if (callback) { 175 callback.call($(opts.contentSelector)[0], data, opts, url); 176 } 177 178 if (opts.prefill) { 179 $window.bind("resize.infinite-scroll", instance._prefill); 180 } 181 }; 182 183 if (options.debug) { 184 // Tell IE9 to use its built-in console 185 if (Function.prototype.bind && (typeof console === 'object' || typeof console === 'function') && typeof console.log === "object") { 186 ["log","info","warn","error","assert","dir","clear","profile","profileEnd"] 187 .forEach(function (method) { 188 console[method] = this.call(console[method], console); 189 }, Function.prototype.bind); 190 } 191 } 192 193 this._setup(); 194 195 // Setups the prefill method for use 196 if (opts.prefill) { 197 this._prefill(); 198 } 199 200 // Return true to indicate successful creation 201 return true; 202 }, 203 204 _prefill: function infscr_prefill() { 205 var instance = this; 206 var $document = $(document); 207 var $window = $(window); 208 209 function needsPrefill() { 210 return ($document.height() <= $window.height()); 211 } 212 213 this._prefill = function() { 214 if (needsPrefill()) { 215 instance.scroll(); 216 } 217 218 $window.bind("resize.infinite-scroll", function() { 219 if (needsPrefill()) { 220 $window.unbind("resize.infinite-scroll"); 221 instance.scroll(); 222 } 223 }); 224 }; 225 226 // Call self after setting up the new function 227 this._prefill(); 228 }, 229 230 // Console log wrapper 231 _debug: function infscr_debug() { 232 if (true !== this.options.debug) { 233 return; 234 } 235 236 if (typeof console !== 'undefined' && typeof console.log === 'function') { 237 // Modern browsers 238 // Single argument, which is a string 239 if ((Array.prototype.slice.call(arguments)).length === 1 && typeof Array.prototype.slice.call(arguments)[0] === 'string') { 240 console.log( (Array.prototype.slice.call(arguments)).toString() ); 241 } else { 242 console.log( Array.prototype.slice.call(arguments) ); 243 } 244 } else if (!Function.prototype.bind && typeof console !== 'undefined' && typeof console.log === 'object') { 245 // IE8 246 Function.prototype.call.call(console.log, console, Array.prototype.slice.call(arguments)); 247 } 248 }, 249 250 // find the number to increment in the path.
251 _determinepath: function infscr_determinepath(path) { 252 253 var opts = this.options; 254 255 // if behavior is defined and this function is extended, call that instead of default 256 if (!!opts.behavior && this['_determinepath_'+opts.behavior] !== undefined) { 257 return this['_determinepath_'+opts.behavior].call(this,path); 258 } 259 260 if (!!opts.pathParse) { 261 262 this._debug('pathParse manual'); 263 return opts.pathParse(path, this.options.state.currPage+1); 264 265 } else if (path.match(/^(.*?)\b2\b(.*?$)/)) { 266 path = path.match(/^(.*?)\b2\b(.*?$)/).slice(1); 267 268 // if there is any 2 in the url at all. 269 } else if (path.match(/^(.*?)2(.*?$)/)) { 270 271 // page= is used in django: 272 // http://www.infinite-scroll.com/changelog/comment-page-1/#comment-127 273 if (path.match(/^(.*?page=)2(\/.*|$)/)) { 274 path = path.match(/^(.*?page=)2(\/.*|$)/).slice(1); 275 return path; 276 } 277 278 path = path.match(/^(.*?)2(.*?$)/).slice(1); 279 280 } else { 281 282 // page= is used in drupal too but second page is page=1 not page=2: 283 // thx Jerod Fritz, vladikoff 284 if (path.match(/^(.*?page=)1(\/.*|$)/)) { 285 path = path.match(/^(.*?page=)1(\/.*|$)/).slice(1); 286 return path; 287 } else { 288 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.'); 289 // Get rid of isInvalidPage to allow permalink to state 290 opts.state.isInvalidPage = true; //prevent it from running on this page. 291 } 292 } 293 this._debug('determinePath', path); 294 return path; 295 296 }, 297 298 // Custom error 299 _error: function infscr_error(xhr) { 300 301 var opts = this.options; 302 303 // if behavior is defined and this function is extended, call that instead of default 304 if (!!opts.behavior && this['_error_'+opts.behavior] !== undefined) { 305 this['_error_'+opts.behavior].call(this,xhr); 306 return; 307 } 308 309 if (xhr !== 'destroy' && xhr !== 'end') { 310 xhr = 'unknown'; 311 } 312 313 this._debug('Error', xhr); 314 315 if (xhr === 'end') { 316 this._showdonemsg(); 317 } 318 319 opts.state.isDone = true; 320 opts.state.currPage = 1; // if you need to go back to this instance 321 opts.state.isPaused = false; 322 this._binding('unbind'); 323 324 }, 325 326 // Load Callback 327 _loadcallback: function infscr_loadcallback(box, data, url) { 328 var opts = this.options, 329 callback = this.options.callback, // GLOBAL OBJECT FOR CALLBACK 330 result = (opts.state.isDone) ? 'done' : (!opts.appendCallback) ? 'no-append' : 'append', 331 frag; 332 333 // if behavior is defined and this function is extended, call that instead of default 334 if (!!opts.behavior && this['_loadcallback_'+opts.behavior] !== undefined) { 335 this['_loadcallback_'+opts.behavior].call(this,box,data); 336 return; 337 } 338 339 switch (result) { 340 case 'done': 341 this._showdonemsg(); 342 return false; 343 344 case 'no-append': 345 if (opts.dataType === 'html') { 346 data = '<div>' + data + '</div>'; 347 data = $(data).find(opts.itemSelector); 348 } 349 break; 350 351 case 'append': 352 var children = box.children(); 353 // if it didn't return anything 354 if (children.length === 0) { 355 return this._error('end'); 356 } 357 358 // use a documentFragment because it works when content is going into a table or UL 359 frag = document.createDocumentFragment(); 360 while (box[0].firstChild) { 361 frag.appendChild(box[0].firstChild); 362 } 363 364 this._debug('contentSelector', $(opts.contentSelector)[0]); 365 $(opts.contentSelector)[0].appendChild(frag); 366 // previously, we would pass in the new DOM element as context for the callback 367 // however we're now using a documentfragment, which doesn't have parents or children, 368 // so the context is the contentContainer guy, and we pass in an array 369 // of the elements collected as the first argument. 370 371 data = children.get(); 372 break; 373 } 374 375 // loadingEnd function 376 opts.loading.finished.call($(opts.contentSelector)[0],opts); 377 378 // smooth scroll to ease in the new content 379 if (opts.animate) {
380 var scrollTo = $(window).scrollTop() + $('#infscr-loading').height() + opts.extraScrollPx + 'px'; 381 $('html,body').animate({ scrollTop: scrollTo }, 800, function () { opts.state.isDuringAjax = false; }); 382 } 383 384 if (!opts.animate) { 385 // once the call is done, we can allow it again. 386 opts.state.isDuringAjax = false; 387 } 388 389 callback(this, data, url); 390 391 if (opts.prefill) { 392 this._prefill(); 393 } 394 }, 395 396 _nearbottom: function infscr_nearbottom() { 397 398 this._debug( this.options.binder.scrollTop() + '::' + $(document).height() + '::' + $(window).height() + '::' + this.options.pixelsFromNavToBottom); 399 var opts = this.options, 400 401 402 pixelsFromWindowBottomToBottom = 0 + $(document).height() - (opts.binder.scrollTop()) - $(window).height(); 403 404 // if behavior is defined and this function is extended, call that instead of default 405 if (!!opts.behavior && this['_nearbottom_'+opts.behavior] !== undefined) { 406 return this['_nearbottom_'+opts.behavior].call(this); 407 } 408 409 this._debug('math:', pixelsFromWindowBottomToBottom, opts.pixelsFromNavToBottom); 410 411 // if distance remaining in the scroll (including buffer) is less than the orignal nav to bottom.... 412 return (pixelsFromWindowBottomToBottom - opts.bufferPx < opts.pixelsFromNavToBottom); 413 414 }, 415 416 // Pause / temporarily disable plugin from firing 417 _pausing: function infscr_pausing(pause) { 418 419 var opts = this.options; 420 421 // if behavior is defined and this function is extended, call that instead of default 422 if (!!opts.behavior && this['_pausing_'+opts.behavior] !== undefined) { 423 this['_pausing_'+opts.behavior].call(this,pause); 424 return; 425 } 426 427 // If pause is not 'pause' or 'resume', toggle it's value 428 if (pause !== 'pause' && pause !== 'resume' && pause !== null) { 429 this._debug('Invalid argument. Toggling pause value instead'); 430 } 431 432 pause = (pause && (pause === 'pause' || pause === 'resume')) ? pause : 'toggle'; 433 434 switch (pause) { 435 case 'pause': 436 opts.state.isPaused = true; 437 break; 438 439 case 'resume': 440 opts.state.isPaused = false; 441 break; 442 443 case 'toggle': 444 opts.state.isPaused = !opts.state.isPaused; 445 break; 446 } 447 448 this._debug('Paused', opts.state.isPaused); 449 return false; 450 451 }, 452 453 // Behavior is determined 454 // If the behavior option is undefined, it will set to default and bind to scroll 455 _setup: function infscr_setup() { 456 457 var opts = this.options; 458 459 // if behavior is defined and this function is extended, call that instead of default 460 if (!!opts.behavior && this['_setup_'+opts.behavior] !== undefined) { 461 this['_setup_'+opts.behavior].call(this); 462 return; 463 } 464 465 this._binding('bind'); 466 467 return false; 468 469 }, 470 471 // Show done message 472 _showdonemsg: function infscr_showdonemsg() { 473 474 var opts = this.options; 475 476 // if behavior is defined and this function is extended, call that instead of default 477 if (!!opts.behavior && this['_showdonemsg_'+opts.behavior] !== undefined) { 478 this['_showdonemsg_'+opts.behavior].call(this); 479 return; 480 } 481 482 opts.loading.msg 483 .find('img') 484 .hide() 485 .parent() 486 .find('div').html(opts.loading.finishedMsg).animate({ opacity: 1 }, 2000, function () { 487 $(this).parent().fadeOut(opts.loading.speed); 488 }); 489 490 // user provided callback when done 491 opts.errorCallback.call($(opts.contentSelector)[0],'done'); 492 }, 493 494 // grab each selector option and see if any fail 495 _validate: function infscr_validate(opts) { 496 for (var key in opts) { 497 if (key.indexOf && key.indexOf('Selector') > -1 && $(opts[key]).length === 0) { 498 this._debug('Your ' + key + ' found no elements.'); 499 return false;
500 } 501 } 502 503 return true; 504 }, 505 506 /* 507 ---------------------------- 508 Public methods 509 ---------------------------- 510 */ 511 512 // Bind to scroll 513 bind: function infscr_bind() { 514 this._binding('bind'); 515 }, 516 517 // Destroy current instance of plugin 518 destroy: function infscr_destroy() { 519 this.options.state.isDestroyed = true; 520 this.options.loading.finished(); 521 return this._error('destroy'); 522 }, 523 524 // Set pause value to false 525 pause: function infscr_pause() { 526 this._pausing('pause'); 527 }, 528 529 // Set pause value to false 530 resume: function infscr_resume() { 531 this._pausing('resume'); 532 }, 533 534 beginAjax: function infscr_ajax(opts) { 535 var instance = this, 536 path = opts.path, 537 box, desturl, method, condition; 538 539 // increment the URL bit. e.g. /page/3/ 540 opts.state.currPage++; 541 542 // Manually control maximum page 543 if ( opts.maxPage != undefined && opts.state.currPage > opts.maxPage ){ 544 this.destroy(); 545 return; 546 } 547 548 // if we're dealing with a table we can't use DIVs 549 box = $(opts.contentSelector).is('table') ? $('<tbody/>') : $('<div/>'); 550 551 desturl = (typeof path === 'function') ? path(opts.state.currPage) : path.join(opts.state.currPage); 552 instance._debug('heading into ajax', desturl); 553 554 method = (opts.dataType === 'html' || opts.dataType === 'json' ) ? opts.dataType : 'html+callback'; 555 if (opts.appendCallback && opts.dataType === 'html') { 556 method += '+callback'; 557 } 558 559 switch (method) { 560 case 'html+callback': 561 instance._debug('Using HTML via .load() method'); 562 box.load(desturl + ' ' + opts.itemSelector, undefined, function infscr_ajax_callback(responseText) { 563 instance._loadcallback(box, responseText, desturl); 564 }); 565 566 break; 567 568 case 'html': 569 instance._debug('Using ' + (method.toUpperCase()) + ' via $.ajax() method'); 570 $.ajax({ 571 // params 572 url: desturl, 573 dataType: opts.dataType, 574 complete: function infscr_ajax_callback(jqXHR, textStatus) { 575 condition = (typeof (jqXHR.isResolved) !== 'undefined') ? (jqXHR.isResolved()) : (textStatus === "success" || textStatus === "notmodified"); 576 if (condition) { 577 instance._loadcallback(box, jqXHR.responseText, desturl); 578 } else { 579 instance._error('end'); 580 } 581 } 582 }); 583 584 break; 585 case 'json': 586 instance._debug('Using ' + (method.toUpperCase()) + ' via $.ajax() method'); 587 $.ajax({ 588 dataType: 'json', 589 type: 'GET', 590 url: desturl, 591 success: function (data, textStatus, jqXHR) { 592 condition = (typeof (jqXHR.isResolved) !== 'undefined') ? (jqXHR.isResolved()) : (textStatus === "success" || textStatus === "notmodified"); 593 if (opts.appendCallback) { 594 // if appendCallback is true, you must defined template in options. 595 // note that data passed into _loadcallback is already an html (after processed in opts.template(data)). 596 if (opts.template !== undefined) { 597 var theData = opts.template(data); 598 box.append(theData); 599 if (condition) { 600 instance._loadcallback(box, theData); 601 } else { 602 instance._error('end'); 603 } 604 } else { 605 instance._debug("template must be defined."); 606 instance._error('end'); 607 } 608 } else { 609 // if appendCallback is false, we will pass in the JSON object. you should handle it yourself in your callback. 610 if (condition) { 611 instance._loadcallback(box, data, desturl); 612 } else { 613 instance._error('end'); 614 } 615 } 616 }, 617 error: function() { 618 instance._debug("JSON ajax request failed."); 619 instance._error('end'); 620 } 621 }); 622 623 break; 624 } 625 }, 626 627 // Retrieve next set of content items 628 retrieve: function infscr_retrieve(pageNum) { 629 pageNum = pageNum || null; 630 631 var instance = this, 632 opts = instance.options; 633 634 // if behavior is defined and this function is extended, call that instead of default 635 if (!!opts.behavior && this['retrieve_'+opts.behavior] !== undefined) { 636 this['retrieve_'+opts.behavior].call(this,pageNum); 637 return; 638 } 639 640 // for manual triggers, if destroyed, get out of here 641 if (opts.state.isDestroyed) { 642 this._debug('Instance is destroyed'); 643 return false;
644 } 645 646 // we dont want to fire the ajax multiple times 647 opts.state.isDuringAjax = true; 648 649 opts.loading.start.call($(opts.contentSelector)[0],opts); 650 }, 651 652 // Check to see next page is needed 653 scroll: function infscr_scroll() { 654 655 var opts = this.options, 656 state = opts.state; 657 658 // if behavior is defined and this function is extended, call that instead of default 659 if (!!opts.behavior && this['scroll_'+opts.behavior] !== undefined) { 660 this['scroll_'+opts.behavior].call(this); 661 return; 662 } 663 664 if (state.isDuringAjax || state.isInvalidPage || state.isDone || state.isDestroyed || state.isPaused) { 665 return; 666 } 667 668 if (!this._nearbottom()) { 669 return; 670 } 671 672 this.retrieve(); 673 674 }, 675 676 // Toggle pause value 677 toggle: function infscr_toggle() { 678 this._pausing(); 679 }, 680 681 // Unbind from scroll 682 unbind: function infscr_unbind() { 683 this._binding('unbind'); 684 }, 685 686 // update options 687 update: function infscr_options(key) { 688 if ($.isPlainObject(key)) { 689 this.options = $.extend(true,this.options,key); 690 } 691 } 692 }; 693 694 695 /* 696 ---------------------------- 697 Infinite Scroll function 698 ---------------------------- 699 700 Borrowed logic from the following... 701 702 jQuery UI 703 - https://github.com/jquery/jquery-ui/blob/master/ui/jquery.ui.widget.js 704 705 jCarousel 706 - https://github.com/jsor/jcarousel/blob/master/lib/jquery.jcarousel.js 707 708 Masonry 709 - https://github.com/desandro/masonry/blob/master/jquery.masonry.js 710 711*/ 712 713 $.fn.infinitescroll = function infscr_init(options, callback) { 714 715 716 var thisCall = typeof options; 717 718 switch (thisCall) { 719 720 // method 721 case 'string': 722 var args = Array.prototype.slice.call(arguments, 1); 723 724 this.each(function () { 725 var instance = $.data(this, 'infinitescroll'); 726 727 if (!instance) { 728 // not setup yet 729 // return $.error('Method ' + options + ' cannot be called until Infinite Scroll is setup'); 730 return false; 731 } 732 733 if (!$.isFunction(instance[options]) || options.charAt(0) === "_") { 734 // return $.error('No such method ' + options + ' for Infinite Scroll'); 735 return false; 736 } 737 738 // no errors! 739 instance[options].apply(instance, args); 740 }); 741 742 break; 743 744 // creation 745 case 'object': 746 747 this.each(function () { 748 749 var instance = $.data(this, 'infinitescroll'); 750 751 if (instance) { 752 753 // update options of current instance 754 instance.update(options); 755 756 } else { 757 758 // initialize new instance 759 instance = new $.infinitescroll(options, callback, this); 760 761 // don't attach if instantiation failed 762 if (!instance.failed) { 763 $.data(this, 'infinitescroll', instance); 764 } 765 766 } 767 768 }); 769 770 break; 771 772 } 773 774 return this; 775 }; 776 777 778 779 /* 780 * smartscroll: debounced scroll event for jQuery * 781 * https://github.com/lukeshumard/smartscroll 782 * Based on smartresize by @louis_remi: https://github.com/lrbabe/jquery.smartresize.js * 783 * Copyright 2011 Louis-Remi & Luke Shumard * Licensed under the MIT license. * 784 */ 785 786 var event = $.event, 787 scrollTimeout; 788 789 event.special.smartscroll = { 790 setup: function () { 791 $(this).bind("scroll", event.special.smartscroll.handler); 792 }, 793 teardown: function () { 794 $(this).unbind("scroll", event.special.smartscroll.handler); 795 }, 796 handler: function (event, execAsap) { 797 // Save the context 798 var context = this, 799 args = arguments; 800 801 // set correct event type 802 event.type = "smartscroll"; 803 804 if (scrollTimeout) { clearTimeout(scrollTimeout); } 805 scrollTimeout = setTimeout(function () { 806 $(context).trigger('smartscroll', args); 807 }, execAsap === "execAsap" ? 0 : 100); 808 } 809 }; 810 811 $.fn.smartscroll = function (fn) { 812 return fn ? this.bind("smartscroll", fn) : this.trigger("smartscroll", ["execAsap"]); 813 }; 814 815 816})(window, jQuery);
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