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September 30, 2012 22:12
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jQuery: Image Preloader
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| $.fn.preloader = function (options) { | |
| var defaults = { | |
| delay: 200, | |
| preload_parent: "", | |
| check_timer: 300, | |
| ondone: function () {}, | |
| oneachload: function (image) {}, | |
| fadein: 500 | |
| }; | |
| // variables declaration and precaching images and parent container | |
| var options = $.extend(defaults, options), | |
| root = $(this), | |
| images = root.find("img") | |
| .css({ | |
| "visibility": "hidden", | |
| opacity: 0 | |
| }), | |
| timer, counter = 0, | |
| i = 0, | |
| checkFlag = [], | |
| delaySum = options.delay, | |
| init = function () { | |
| timer = setInterval(function () { | |
| if (counter >= checkFlag.length) { | |
| clearInterval(timer); | |
| options.ondone(); | |
| return; | |
| } | |
| for (i = 0; i < images.length; i++) { | |
| if (images[i].complete === true) { | |
| if (checkFlag[i] === false) { | |
| checkFlag[i] = true; | |
| options.oneachload(images[i]); | |
| counter++; | |
| delaySum = delaySum + options.delay; | |
| } | |
| $(images[i]) | |
| .css("visibility", "visible") | |
| .delay(delaySum) | |
| .animate({ | |
| opacity: 1 | |
| }, options.fadein, | |
| function () { | |
| $(this) | |
| .parent() | |
| .removeClass("preloader"); | |
| }); | |
| } | |
| } | |
| }, options.check_timer); | |
| }; | |
| images.each(function () { | |
| if ($(this) | |
| .parent(options.preload_parent) | |
| .length === 0) $(this) | |
| .wrap("<div class='preloader' />"); | |
| else $(this) | |
| .parent() | |
| .addClass("preloader"); | |
| checkFlag[i++] = false; | |
| }); | |
| images = $.makeArray(images); | |
| var icon = jQuery("<img />", { | |
| id: 'loadingicon', | |
| src: '/assets/img/ajax-loader.gif' | |
| }) | |
| .hide() | |
| .appendTo("body"); | |
| timer = setInterval(function () { | |
| if (icon[0].complete === true) { | |
| clearInterval(timer); | |
| init(); | |
| icon.remove(); | |
| return; | |
| } | |
| }, 100); | |
| }; | |
| $(function () { | |
| jQuery(".grid") | |
| .preloader(); //activate the preloader on specified images | |
| }); |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| $.fn.preloader = function (options) { | |
| var defaults = { | |
| delay: 200, | |
| preload_parent: "", | |
| check_timer: 300, | |
| ondone: function () {}, | |
| oneachload: function (image) {}, | |
| fadein: 500 | |
| }; | |
| // variables declaration and precaching images and parent container | |
| var options = $.extend(defaults, options), | |
| root = $(this), | |
| images = root.find("img") | |
| .css({ | |
| "visibility": "hidden", | |
| opacity: 0 | |
| }), | |
| timer, counter = 0, | |
| i = 0, | |
| checkFlag = [], | |
| delaySum = options.delay, | |
| init = function () { | |
| timer = setInterval(function () { | |
| if (counter >= checkFlag.length) { | |
| clearInterval(timer); | |
| options.ondone(); | |
| return; | |
| } | |
| for (i = 0; i < images.length; i++) { | |
| if (images[i].complete === true) { | |
| if (checkFlag[i] === false) { | |
| checkFlag[i] = true; | |
| options.oneachload(images[i]); | |
| counter++; | |
| delaySum = delaySum + options.delay; | |
| } | |
| $(images[i]) | |
| .css("visibility", "visible") | |
| .delay(delaySum) | |
| .animate({ | |
| opacity: 1 | |
| }, options.fadein, | |
| function () { | |
| $(this) | |
| .parent() | |
| .removeClass("preloader"); | |
| }); | |
| } | |
| } | |
| }, options.check_timer); | |
| }; | |
| images.each(function () { | |
| if ($(this) | |
| .parent(options.preload_parent) | |
| .length === 0) $(this) | |
| .wrap("<div class='preloader' />"); | |
| else $(this) | |
| .parent() | |
| .addClass("preloader"); | |
| checkFlag[i++] = false; | |
| }); | |
| images = $.makeArray(images); | |
| var icon = jQuery("<img />", { | |
| id: 'loadingicon', | |
| src: '/assets/img/ajax-loader.gif' | |
| }) | |
| .hide() | |
| .appendTo("body"); | |
| timer = setInterval(function () { | |
| if (icon[0].complete === true) { | |
| clearInterval(timer); | |
| init(); | |
| icon.remove(); | |
| return; | |
| } | |
| }, 100); | |
| }; | |
| $(function () { | |
| jQuery(".grid") | |
| .preloader(); //activate the preloader on specified images | |
| }); |
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