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1 /*
2 * Lazy Load - jQuery plugin for lazy loading images
3 *
4 * Copyright (c) 2007-2012 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: 1.8.0
13 *
14 */
15 (function($, window) {
16 var $window = $(window);
17
18 $.fn.lazyload = function(options) {
19 var elements = this;
20 var $container;
21 var settings = {
22 threshold : 0,
23 failure_limit : 0,
24 event : "scroll",
25 effect : "show",
26 container : window,
27 data_attribute : "original",
28 skip_invisible : true,
29 appear : null,
30 load : null
31 };
32
33 function update() {
34 var counter = 0;
35
36 elements.each(function() {
37 var $this = $(this);
38 if (settings.skip_invisible && !$this.is(":visible")) {
39 return;
40 }
41 if ($.abovethetop(this, settings) ||
42 $.leftofbegin(this, settings)) {
43 /* Nothing. */
44 } else if (!$.belowthefold(this, settings) &&
45 !$.rightoffold(this, settings)) {
46 $this.trigger("appear");
47 } else {
48 if (++counter > settings.failure_limit) {
49 return false;
50 }
51 }
52 });
53
54 }
55
56 if(options) {
57 /* Maintain BC for a couple of versions. */
58 if (undefined !== options.failurelimit) {
59 options.failure_limit = options.failurelimit;
60 delete options.failurelimit;
61 }
62 if (undefined !== options.effectspeed) {
63 options.effect_speed = options.effectspeed;
64 delete options.effectspeed;
65 }
66
67 $.extend(settings, options);
68 }
69
70 /* Cache container as jQuery as object. */
71 $container = (settings.container === undefined ||
72 settings.container === window) ? $window : $(settings.container);
73
74 /* Fire one scroll event per scroll. Not one scroll event per image. */
75 if (0 === settings.event.indexOf("scroll")) {
76 $container.bind(settings.event, function(event) {
77 return update();
78 });
79 }
80
81 this.each(function() {
82 var self = this;
83 var $self = $(self);
84
85 self.loaded = false;
86
87 /* When appear is triggered load original image. */
88 $self.one("appear", function() {
89 if (!this.loaded) {
90 if (settings.appear) {
91 var elements_left = elements.length;
92 settings.appear.call(self, elements_left, settings);
93 }
94 $("<img />")
95 .bind("load", function() {
96 $self
97 .hide()
98 .attr("src", $self.data(settings.data_attribute))
99 [settings.effect](settings.effect_speed);
100 self.loaded = true;
101
102 /* Remove image from array so it is not looped next time. */
103 var temp = $.grep(elements, function(element) {
104 return !element.loaded;
105 });
106 elements = $(temp);
107
108 if (settings.load) {
109 var elements_left = elements.length;
110 settings.load.call(self, elements_left, settings);
111 }
112 })
113 .attr("src", $self.data(settings.data_attribute));
114 }
115 });
116
117 /* When wanted event is triggered load original image */
118 /* by triggering appear. */
119 if (0 !== settings.event.indexOf("scroll")) {
120 $self.bind(settings.event, function(event) {
121 if (!self.loaded) {
122 $self.trigger("appear");
123 }
124 });
125 }
126 });
127
128 /* Check if something appears when window is resized. */
129 $window.bind("resize", function(event) {
130 update();
131 });
132
133 /* Force initial check if images should appear. */
134 update();
135
136 return this;
137 };
138
139 /* Convenience methods in jQuery namespace. */
140 /* Use as $.belowthefold(element, {threshold : 100, container : window}) */
141
142 $.belowthefold = function(element, settings) {
143 var fold;
144
145 if (settings.container === undefined || settings.container === window) {
146 fold = $window.height() + $window.scrollTop();
147 } else {
148 fold = $(settings.container).offset().top + $(settings.container).height();
149 }
150
151 return fold <= $(element).offset().top - settings.threshold;
152 };
153
154 $.rightoffold = function(element, settings) {
155 var fold;
156
157 if (settings.container === undefined || settings.container === window) {
158 fold = $window.width() + $window.scrollLeft();
159 } else {
160 fold = $(settings.container).offset().left + $(settings.container).width();
161 }
162
163 return fold <= $(element).offset().left - settings.threshold;
164 };
165
166 $.abovethetop = function(element, settings) {
167 var fold;
168
169 if (settings.container === undefined || settings.container === window) {
170 fold = $window.scrollTop();
171 } else {
172 fold = $(settings.container).offset().top;
173 }
174
175 return fold >= $(element).offset().top + settings.threshold + $(element).height();
176 };
177
178 $.leftofbegin = function(element, settings) {
179 var fold;
180
181 if (settings.container === undefined || settings.container === window) {
182 fold = $window.scrollLeft();
183 } else {
184 fold = $(settings.container).offset().left;
185 }
186
187 return fold >= $(element).offset().left + settings.threshold + $(element).width();
188 };
189
190 $.inviewport = function(element, settings) {
191 return !$.rightofscreen(element, settings) && !$.leftofscreen(element, settings) &&
192 !$.belowthefold(element, settings) && !$.abovethetop(element, settings);
193 };
194
195 /* Custom selectors for your convenience. */
196 /* Use as $("img:below-the-fold").something() */
197
198 $.extend($.expr[':'], {
199 "below-the-fold" : function(a) { return $.belowthefold(a, {threshold : 0}); },
200 "above-the-top" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
201 "right-of-screen": function(a) { return $.rightoffold(a, {threshold : 0}); },
202 "left-of-screen" : function(a) { return !$.rightoffold(a, {threshold : 0}); },
203 "in-viewport" : function(a) { return !$.inviewport(a, {threshold : 0}); },
204 /* Maintain BC for couple of versions. */
205 "above-the-fold" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
206 "right-of-fold" : function(a) { return $.rightoffold(a, {threshold : 0}); },
207 "left-of-fold" : function(a) { return !$.rightoffold(a, {threshold : 0}); }
208 });
209
210 })(jQuery, window);
2 * Lazy Load - jQuery plugin for lazy loading images
3 *
4 * Copyright (c) 2007-2012 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: 1.8.0
13 *
14 */
15 (function($, window) {
16 var $window = $(window);
17
18 $.fn.lazyload = function(options) {
19 var elements = this;
20 var $container;
21 var settings = {
22 threshold : 0,
23 failure_limit : 0,
24 event : "scroll",
25 effect : "show",
26 container : window,
27 data_attribute : "original",
28 skip_invisible : true,
29 appear : null,
30 load : null
31 };
32
33 function update() {
34 var counter = 0;
35
36 elements.each(function() {
37 var $this = $(this);
38 if (settings.skip_invisible && !$this.is(":visible")) {
39 return;
40 }
41 if ($.abovethetop(this, settings) ||
42 $.leftofbegin(this, settings)) {
43 /* Nothing. */
44 } else if (!$.belowthefold(this, settings) &&
45 !$.rightoffold(this, settings)) {
46 $this.trigger("appear");
47 } else {
48 if (++counter > settings.failure_limit) {
49 return false;
50 }
51 }
52 });
53
54 }
55
56 if(options) {
57 /* Maintain BC for a couple of versions. */
58 if (undefined !== options.failurelimit) {
59 options.failure_limit = options.failurelimit;
60 delete options.failurelimit;
61 }
62 if (undefined !== options.effectspeed) {
63 options.effect_speed = options.effectspeed;
64 delete options.effectspeed;
65 }
66
67 $.extend(settings, options);
68 }
69
70 /* Cache container as jQuery as object. */
71 $container = (settings.container === undefined ||
72 settings.container === window) ? $window : $(settings.container);
73
74 /* Fire one scroll event per scroll. Not one scroll event per image. */
75 if (0 === settings.event.indexOf("scroll")) {
76 $container.bind(settings.event, function(event) {
77 return update();
78 });
79 }
80
81 this.each(function() {
82 var self = this;
83 var $self = $(self);
84
85 self.loaded = false;
86
87 /* When appear is triggered load original image. */
88 $self.one("appear", function() {
89 if (!this.loaded) {
90 if (settings.appear) {
91 var elements_left = elements.length;
92 settings.appear.call(self, elements_left, settings);
93 }
94 $("<img />")
95 .bind("load", function() {
96 $self
97 .hide()
98 .attr("src", $self.data(settings.data_attribute))
99 [settings.effect](settings.effect_speed);
100 self.loaded = true;
101
102 /* Remove image from array so it is not looped next time. */
103 var temp = $.grep(elements, function(element) {
104 return !element.loaded;
105 });
106 elements = $(temp);
107
108 if (settings.load) {
109 var elements_left = elements.length;
110 settings.load.call(self, elements_left, settings);
111 }
112 })
113 .attr("src", $self.data(settings.data_attribute));
114 }
115 });
116
117 /* When wanted event is triggered load original image */
118 /* by triggering appear. */
119 if (0 !== settings.event.indexOf("scroll")) {
120 $self.bind(settings.event, function(event) {
121 if (!self.loaded) {
122 $self.trigger("appear");
123 }
124 });
125 }
126 });
127
128 /* Check if something appears when window is resized. */
129 $window.bind("resize", function(event) {
130 update();
131 });
132
133 /* Force initial check if images should appear. */
134 update();
135
136 return this;
137 };
138
139 /* Convenience methods in jQuery namespace. */
140 /* Use as $.belowthefold(element, {threshold : 100, container : window}) */
141
142 $.belowthefold = function(element, settings) {
143 var fold;
144
145 if (settings.container === undefined || settings.container === window) {
146 fold = $window.height() + $window.scrollTop();
147 } else {
148 fold = $(settings.container).offset().top + $(settings.container).height();
149 }
150
151 return fold <= $(element).offset().top - settings.threshold;
152 };
153
154 $.rightoffold = function(element, settings) {
155 var fold;
156
157 if (settings.container === undefined || settings.container === window) {
158 fold = $window.width() + $window.scrollLeft();
159 } else {
160 fold = $(settings.container).offset().left + $(settings.container).width();
161 }
162
163 return fold <= $(element).offset().left - settings.threshold;
164 };
165
166 $.abovethetop = function(element, settings) {
167 var fold;
168
169 if (settings.container === undefined || settings.container === window) {
170 fold = $window.scrollTop();
171 } else {
172 fold = $(settings.container).offset().top;
173 }
174
175 return fold >= $(element).offset().top + settings.threshold + $(element).height();
176 };
177
178 $.leftofbegin = function(element, settings) {
179 var fold;
180
181 if (settings.container === undefined || settings.container === window) {
182 fold = $window.scrollLeft();
183 } else {
184 fold = $(settings.container).offset().left;
185 }
186
187 return fold >= $(element).offset().left + settings.threshold + $(element).width();
188 };
189
190 $.inviewport = function(element, settings) {
191 return !$.rightofscreen(element, settings) && !$.leftofscreen(element, settings) &&
192 !$.belowthefold(element, settings) && !$.abovethetop(element, settings);
193 };
194
195 /* Custom selectors for your convenience. */
196 /* Use as $("img:below-the-fold").something() */
197
198 $.extend($.expr[':'], {
199 "below-the-fold" : function(a) { return $.belowthefold(a, {threshold : 0}); },
200 "above-the-top" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
201 "right-of-screen": function(a) { return $.rightoffold(a, {threshold : 0}); },
202 "left-of-screen" : function(a) { return !$.rightoffold(a, {threshold : 0}); },
203 "in-viewport" : function(a) { return !$.inviewport(a, {threshold : 0}); },
204 /* Maintain BC for couple of versions. */
205 "above-the-fold" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
206 "right-of-fold" : function(a) { return $.rightoffold(a, {threshold : 0}); },
207 "left-of-fold" : function(a) { return !$.rightoffold(a, {threshold : 0}); }
208 });
209
210 })(jQuery, window);
