211 lines
7.4 KiB
JavaScript
211 lines
7.4 KiB
JavaScript
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/*
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* Lazy Load - jQuery plugin for lazy loading images
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*
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* Copyright (c) 2007-2012 Mika Tuupola
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/mit-license.php
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*
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* Project home:
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* http://www.appelsiini.net/projects/lazyload
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*
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* Version: 1.7.2
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*
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*/
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(function($, window) {
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$window = $(window);
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$.fn.lazyload = function(options) {
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var elements = this;
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var settings = {
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threshold : 0,
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failure_limit : 0,
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event : "scroll",
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effect : "show",
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container : window,
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data_attribute : "original",
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skip_invisible : true,
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appear : null,
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load : null
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};
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function update() {
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var counter = 0;
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elements.each(function() {
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var $this = $(this);
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if (settings.skip_invisible && !$this.is(":visible")) {
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return;
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}
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if ($.abovethetop(this, settings) ||
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$.leftofbegin(this, settings)) {
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/* Nothing. */
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} else if (!$.belowthefold(this, settings) &&
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!$.rightoffold(this, settings)) {
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$this.trigger("appear");
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} else {
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if (++counter > settings.failure_limit) {
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return false;
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}
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}
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});
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}
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if(options) {
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/* Maintain BC for a couple of versions. */
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if (undefined !== options.failurelimit) {
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options.failure_limit = options.failurelimit;
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delete options.failurelimit;
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}
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if (undefined !== options.effectspeed) {
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options.effect_speed = options.effectspeed;
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delete options.effectspeed;
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}
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$.extend(settings, options);
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}
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/* Cache container as jQuery as object. */
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$container = (settings.container === undefined ||
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settings.container === window) ? $window : $(settings.container);
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/* Fire one scroll event per scroll. Not one scroll event per image. */
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if (0 === settings.event.indexOf("scroll")) {
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$container.bind(settings.event, function(event) {
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return update();
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});
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}
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this.each(function() {
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var self = this;
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var $self = $(self);
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self.loaded = false;
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/* When appear is triggered load original image. */
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$self.one("appear", function() {
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if (!this.loaded) {
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if (settings.appear) {
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var elements_left = elements.length;
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settings.appear.call(self, elements_left, settings);
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}
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$("<img />")
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.bind("load", function() {
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$self
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.hide()
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.attr("src", $self.data(settings.data_attribute))
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[settings.effect](settings.effect_speed);
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self.loaded = true;
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/* Remove image from array so it is not looped next time. */
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var temp = $.grep(elements, function(element) {
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return !element.loaded;
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});
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elements = $(temp);
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if (settings.load) {
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var elements_left = elements.length;
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settings.load.call(self, elements_left, settings);
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}
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})
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.attr("src", $self.data(settings.data_attribute));
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}
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});
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/* When wanted event is triggered load original image */
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/* by triggering appear. */
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if (0 !== settings.event.indexOf("scroll")) {
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$self.bind(settings.event, function(event) {
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if (!self.loaded) {
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$self.trigger("appear");
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}
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});
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}
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});
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/* Check if something appears when window is resized. */
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$window.bind("resize", function(event) {
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update();
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});
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/* Force initial check if images should appear. */
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update();
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return this;
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};
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/* Convenience methods in jQuery namespace. */
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/* Use as $.belowthefold(element, {threshold : 100, container : window}) */
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$.belowthefold = function(element, settings) {
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var fold;
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if (settings.container === undefined || settings.container === window) {
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fold = $window.height() + $window.scrollTop();
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} else {
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fold = $container.offset().top + $container.height();
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}
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return fold <= $(element).offset().top - settings.threshold;
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};
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$.rightoffold = function(element, settings) {
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var fold;
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if (settings.container === undefined || settings.container === window) {
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fold = $window.width() + $window.scrollLeft();
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} else {
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fold = $container.offset().left + $container.width();
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}
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return fold <= $(element).offset().left - settings.threshold;
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};
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$.abovethetop = function(element, settings) {
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var fold;
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if (settings.container === undefined || settings.container === window) {
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fold = $window.scrollTop();
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} else {
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fold = $container.offset().top;
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}
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return fold >= $(element).offset().top + settings.threshold + $(element).height();
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};
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$.leftofbegin = function(element, settings) {
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var fold;
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if (settings.container === undefined || settings.container === window) {
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fold = $window.scrollLeft();
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} else {
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fold = $container.offset().left;
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}
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return fold >= $(element).offset().left + settings.threshold + $(element).width();
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};
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$.inviewport = function(element, settings) {
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return !$.rightofscreen(element, settings) && !$.leftofscreen(element, settings) &&
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!$.belowthefold(element, settings) && !$.abovethetop(element, settings);
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};
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/* Custom selectors for your convenience. */
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/* Use as $("img:below-the-fold").something() */
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$.extend($.expr[':'], {
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"below-the-fold" : function(a) { return $.belowthefold(a, {threshold : 0, container: window}); },
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"above-the-top" : function(a) { return !$.belowthefold(a, {threshold : 0, container: window}); },
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"right-of-screen": function(a) { return $.rightoffold(a, {threshold : 0, container: window}); },
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"left-of-screen" : function(a) { return !$.rightoffold(a, {threshold : 0, container: window}); },
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"in-viewport" : function(a) { return !$.inviewport(a, {threshold : 0, container: window}); },
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/* Maintain BC for couple of versions. */
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"above-the-fold" : function(a) { return !$.belowthefold(a, {threshold : 0, container: window}); },
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"right-of-fold" : function(a) { return $.rightoffold(a, {threshold : 0, container: window}); },
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"left-of-fold" : function(a) { return !$.rightoffold(a, {threshold : 0, container: window}); }
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});
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})(jQuery, window);
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