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| Original file line number | Diff line number | Diff line change |
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| /** | ||
| * jQuery.Preload | ||
| * Copyright (c) 2008 Ariel Flesler - aflesler(at)gmail(dot)com | ||
| * Dual licensed under MIT and GPL. | ||
| * Date: 3/25/2009 | ||
| * | ||
| * @projectDescription Multifunctional preloader | ||
| * @author Ariel Flesler | ||
| * @version 1.0.8 | ||
| * | ||
| * @id jQuery.preload | ||
| * @param {String, jQuery, Array< String, <a>, <link>, <img> >} original Collection of sources to preload | ||
| * @param {Object} settings Hash of settings. | ||
| * | ||
| * @id jQuery.fn.preload | ||
| * @param {Object} settings Hash of settings. | ||
| * @return {jQuery} Returns the same jQuery object, for chaining. | ||
| * | ||
| * @example Link Mode: | ||
| * $.preload( '#images a' ); | ||
| * | ||
| * @example Rollover Mode: | ||
| * $.preload( '#images img', { | ||
| * find:/\.(gif|jpg)/, | ||
| * replace:'_over.$1' | ||
| * }); | ||
| * | ||
| * @example Src Mode: | ||
| * $.preload( [ 'red', 'blue', 'yellow' ], { | ||
| * base:'images/colors/', | ||
| * ext:'.jpg' | ||
| * }); | ||
| * | ||
| * @example Placeholder Mode: | ||
| * $.preload( '#images img', { | ||
| * placeholder:'placeholder.jpg', | ||
| * notFound:'notfound.jpg' | ||
| * }); | ||
| * | ||
| * @example Placeholder+Rollover Mode(High res): | ||
| * $.preload( '#images img', { | ||
| * placeholder:true, | ||
| * find:/\.(gif|jpg)/, | ||
| * replace:'_high.$1' | ||
| * }); | ||
| */ | ||
| ;(function( $ ){ | ||
|
|
||
| var $preload = $.preload = function( original, settings ){ | ||
| if( original.split ) // selector | ||
| original = $(original); | ||
|
|
||
| settings = $.extend( {}, $preload.defaults, settings ); | ||
| var sources = $.map( original, function( source ){ | ||
| if( !source ) | ||
| return; // skip | ||
| if( source.split ) // URL Mode | ||
| return settings.base + source + settings.ext; | ||
| var url = source.src || source.href; // save the original source | ||
| if( typeof settings.placeholder == 'string' && source.src ) // Placeholder Mode, if it's an image, set it. | ||
| source.src = settings.placeholder; | ||
| if( url && settings.find ) // Rollover mode | ||
| url = url.replace( settings.find, settings.replace ); | ||
| return url || null; // skip if empty string | ||
| }); | ||
|
|
||
| var data = { | ||
| loaded:0, // how many were loaded successfully | ||
| failed:0, // how many urls failed | ||
| next:0, // which one's the next image to load (index) | ||
| done:0, // how many urls were tried | ||
| /* | ||
| index:0, // index of the related image | ||
| found:false, // whether the last one was successful | ||
| */ | ||
| total:sources.length // how many images are being preloaded overall | ||
| }; | ||
|
|
||
| if( !data.total ) // nothing to preload | ||
| return finish(); | ||
|
|
||
| var imgs = $(Array(settings.threshold+1).join('<img/>')) | ||
| .load(handler).error(handler).bind('abort',handler).each(fetch); | ||
|
|
||
| function handler( e ){ | ||
| data.element = this; | ||
| data.found = e.type == 'load'; | ||
| data.image = this.src; | ||
| data.index = this.index; | ||
| var orig = data.original = original[this.index]; | ||
| data[data.found?'loaded':'failed']++; | ||
| data.done++; | ||
|
|
||
| // This will ensure that the images aren't "un-cached" after a while | ||
| if( settings.enforceCache ) | ||
| $preload.cache.push( | ||
| $('<img/>').attr('src',data.image)[0] | ||
| ); | ||
|
|
||
| if( settings.placeholder && orig.src ) // special case when on placeholder mode | ||
| orig.src = data.found ? data.image : settings.notFound || orig.src; | ||
| if( settings.onComplete ) | ||
| settings.onComplete( data ); | ||
| if( data.done < data.total ) // let's continue | ||
| fetch( 0, this ); | ||
| else{ // we are finished | ||
| if( imgs && imgs.unbind ) | ||
| imgs.unbind('load').unbind('error').unbind('abort'); // cleanup | ||
| imgs = null; | ||
| finish(); | ||
| } | ||
| }; | ||
| function fetch( i, img, retry ){ | ||
| // IE problem, can't preload more than 15 | ||
| if( img.attachEvent /* msie */ && data.next && data.next % $preload.gap == 0 && !retry ){ | ||
| setTimeout(function(){ fetch( i, img, true ); }, 0); | ||
| return false; | ||
| } | ||
| if( data.next == data.total ) return false; // no more to fetch | ||
| img.index = data.next; // save it, we'll need it. | ||
| img.src = sources[data.next++]; | ||
| if( settings.onRequest ){ | ||
| data.index = img.index; | ||
| data.element = img; | ||
| data.image = img.src; | ||
| data.original = original[data.next-1]; | ||
| settings.onRequest( data ); | ||
| } | ||
| }; | ||
| function finish(){ | ||
| if( settings.onFinish ) | ||
| settings.onFinish( data ); | ||
| }; | ||
| }; | ||
|
|
||
| // each time we load this amount and it's IE, we must rest for a while, make it lower if you get stack overflow. | ||
| $preload.gap = 14; | ||
| $preload.cache = []; | ||
|
|
||
| $preload.defaults = { | ||
| threshold:2, // how many images to load simultaneously | ||
| base:'', // URL mode: a base url can be specified, it is prepended to all string urls | ||
| ext:'', // URL mode:same as base, but it's appended after the original url. | ||
| replace:'' // Rollover mode: replacement (can be left empty) | ||
| /* | ||
| enforceCache: false, // If true, the plugin will save a copy of the images in $.preload.cache | ||
| find:null, // Rollover mode: a string or regex for the replacement | ||
| notFound:'' // Placeholder Mode: Optional url of an image to use when the original wasn't found | ||
| placeholder:'', // Placeholder Mode: url of an image to set while loading | ||
| onRequest:function( data ){ ... }, // callback called every time a new url is requested | ||
| onComplete:function( data ){ ... }, // callback called every time a response is received(successful or not) | ||
| onFinish:function( data ){ ... } // callback called after all the images were loaded(or failed) | ||
| */ | ||
| }; | ||
|
|
||
| $.fn.preload = function( settings ){ | ||
| $preload( this, settings ); | ||
| return this; | ||
| }; | ||
|
|
||
| })( jQuery ); |
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