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1/*
2 * Lazy Load - jQuery plugin for lazy loading images
3 *
4 * Copyright (c) 2007-2013 Mika Tuupola
5 *
6 * Licensed under the MIT license:
7 * http://www.opensource.org/licenses/mit-license.php
8 *
9 * Project home:
10 * http://www.appelsiini.net/projects/lazyload
11 *
12 * Version: 1.9.3
13 *
14 */
15
16(function($, window, document, undefined) {
17 var $window = $(window);
18
19 $.fn.lazyload = function(options) {
20 var elements = this;
21 var $container;
22 var settings = {
23 threshold : 0,
24 failure_limit : 0,
25 event : "scroll",
26 effect : "show",
27 container : window,
28 data_attribute : "original",
29 skip_invisible : true,
30 appear : null,
31 load : null,
32 placeholder : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC"
33 };
34
35 function update() {
36 var counter = 0;
37
38 elements.each(function() {
39 var $this = $(this);
40 if (settings.skip_invisible && !$this.is(":visible")) {
41 return;
42 }
43 if ($.abovethetop(this, settings) ||
44 $.leftofbegin(this, settings)) {
45 /* Nothing. */
46 } else if (!$.belowthefold(this, settings) &&
47 !$.rightoffold(this, settings)) {
48 $this.trigger("appear");
49 /* if we found an image we'll load, reset the counter */
50 counter = 0;
51 } else {
52 if (++counter > settings.failure_limit) {
53 return false;
54 }
55 }
56 });
57
58 }
59
60 if(options) {
61 /* Maintain BC for a couple of versions. */
62 if (undefined !== options.failurelimit) {
63 options.failure_limit = options.failurelimit;
64 delete options.failurelimit;
65 }
66 if (undefined !== options.effectspeed) {
67 options.effect_speed = options.effectspeed;
68 delete options.effectspeed;
69 }
70
71 $.extend(settings, options);
72 }
73
74 /* Cache container as jQuery as object. */
75 $container = (settings.container === undefined ||
76 settings.container === window) ? $window : $(settings.container);
77
78 /* Fire one scroll event per scroll. Not one scroll event per image. */
79 if (0 === settings.event.indexOf("scroll")) {
80 $container.bind(settings.event, function() {
81 return update();
82 });
83 }
84
85 this.each(function() {
86 var self = this;
87 var $self = $(self);
88
89 self.loaded = false;
90
91 /* If no src attribute given use data:uri. */
92 if ($self.attr("src") === undefined || $self.attr("src") === false) {
93 if ($self.is("img")) {
94 $self.attr("src", settings.placeholder);
95 }
96 }
97
98 /* When appear is triggered load original image. */
99 $self.one("appear", function() {
100 if (!this.loaded) {
101 if (settings.appear) {
102 var elements_left = elements.length;
103 settings.appear.call(self, elements_left, settings);
104 }
105 $("<img />")
106 .bind("load", function() {
107
108 var original = $self.attr("data-" + settings.data_attribute);
109 $self.hide();
110 if ($self.is("img")) {
111 $self.attr("src", original);
112 } else {
113 $self.css("background-image", "url('" + original + "')");
114 }
115 $self[settings.effect](settings.effect_speed);
116
117 self.loaded = true;
118
119 /* Remove image from array so it is not looped next time. */
120 var temp = $.grep(elements, function(element) {
121 return !element.loaded;
122 });
123 elements = $(temp);
124
125 if (settings.load) {
126 var elements_left = elements.length;
127 settings.load.call(self, elements_left, settings);
128 }
129 })
130 .attr("src", $self.attr("data-" + settings.data_attribute));
131 }
132 });
133
134 /* When wanted event is triggered load original image */
135 /* by triggering appear. */
136 if (0 !== settings.event.indexOf("scroll")) {
137 $self.bind(settings.event, function() {
138 if (!self.loaded) {
139 $self.trigger("appear");
140 }
141 });
142 }
143 });
144
145 /* Check if something appears when window is resized. */
146 $window.bind("resize", function() {
147 update();
148 });
149
150 /* With IOS5 force loading images when navigating with back button. */
151 /* Non optimal workaround. */
152 if ((/(?:iphone|ipod|ipad).*os 5/gi).test(navigator.appVersion)) {
153 $window.bind("pageshow", function(event) {
154 if (event.originalEvent && event.originalEvent.persisted) {
155 elements.each(function() {
156 $(this).trigger("appear");
157 });
158 }
159 });
160 }
161
162 /* Force initial check if images should appear. */
163 $(document).ready(function() {
164 update();
165 });
166
167 return this;
168 };
169
170 /* Convenience methods in jQuery namespace. */
171 /* Use as $.belowthefold(element, {threshold : 100, container : window}) */
172
173 $.belowthefold = function(element, settings) {
174 var fold;
175
176 if (settings.container === undefined || settings.container === window) {
177 fold = (window.innerHeight ? window.innerHeight : $window.height()) + $window.scrollTop();
178 } else {
179 fold = $(settings.container).offset().top + $(settings.container).height();
180 }
181
182 return fold <= $(element).offset().top - settings.threshold;
183 };
184
185 $.rightoffold = function(element, settings) {
186 var fold;
187
188 if (settings.container === undefined || settings.container === window) {
189 fold = $window.width() + $window.scrollLeft();
190 } else {
191 fold = $(settings.container).offset().left + $(settings.container).width();
192 }
193
194 return fold <= $(element).offset().left - settings.threshold;
195 };
196
197 $.abovethetop = function(element, settings) {
198 var fold;
199
200 if (settings.container === undefined || settings.container === window) {
201 fold = $window.scrollTop();
202 } else {
203 fold = $(settings.container).offset().top;
204 }
205
206 return fold >= $(element).offset().top + settings.threshold + $(element).height();
207 };
208
209 $.leftofbegin = function(element, settings) {
210 var fold;
211
212 if (settings.container === undefined || settings.container === window) {
213 fold = $window.scrollLeft();
214 } else {
215 fold = $(settings.container).offset().left;
216 }
217
218 return fold >= $(element).offset().left + settings.threshold + $(element).width();
219 };
220
221 $.inviewport = function(element, settings) {
222 return !$.rightoffold(element, settings) && !$.leftofbegin(element, settings) &&
223 !$.belowthefold(element, settings) && !$.abovethetop(element, settings);
224 };
225
226 /* Custom selectors for your convenience. */
227 /* Use as $("img:below-the-fold").something() or */
228 /* $("img").filter(":below-the-fold").something() which is faster */
229
230 $.extend($.expr[":"], {
231 "below-the-fold" : function(a) { return $.belowthefold(a, {threshold : 0}); },
232 "above-the-top" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
233 "right-of-screen": function(a) { return $.rightoffold(a, {threshold : 0}); },
234 "left-of-screen" : function(a) { return !$.rightoffold(a, {threshold : 0}); },
235 "in-viewport" : function(a) { return $.inviewport(a, {threshold : 0}); },
236 /* Maintain BC for couple of versions. */
237 "above-the-fold" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
238 "right-of-fold" : function(a) { return $.rightoffold(a, {threshold : 0}); },
239 "left-of-fold" : function(a) { return !$.rightoffold(a, {threshold : 0}); }
240 });
241
242})(jQuery, window, document);
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