242 lines
8.8 KiB
JavaScript
Executable File
242 lines
8.8 KiB
JavaScript
Executable File
/*
|
|
* Lazy Load - jQuery plugin for lazy loading images
|
|
*
|
|
* Copyright (c) 2007-2013 Mika Tuupola
|
|
*
|
|
* Licensed under the MIT license:
|
|
* http://www.opensource.org/licenses/mit-license.php
|
|
*
|
|
* Project home:
|
|
* http://www.appelsiini.net/projects/lazyload
|
|
*
|
|
* Version: 1.9.3
|
|
*
|
|
*/
|
|
|
|
(function($, window, document, undefined) {
|
|
var $window = $(window);
|
|
|
|
$.fn.lazyload = function(options) {
|
|
var elements = this;
|
|
var $container;
|
|
var settings = {
|
|
threshold : 0,
|
|
failure_limit : 0,
|
|
event : "scroll",
|
|
effect : "show",
|
|
container : window,
|
|
data_attribute : "original",
|
|
skip_invisible : true,
|
|
appear : null,
|
|
load : null,
|
|
placeholder : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC"
|
|
};
|
|
|
|
function update() {
|
|
var counter = 0;
|
|
|
|
elements.each(function() {
|
|
var $this = $(this);
|
|
if (settings.skip_invisible && !$this.is(":visible")) {
|
|
return;
|
|
}
|
|
if ($.abovethetop(this, settings) ||
|
|
$.leftofbegin(this, settings)) {
|
|
/* Nothing. */
|
|
} else if (!$.belowthefold(this, settings) &&
|
|
!$.rightoffold(this, settings)) {
|
|
$this.trigger("appear");
|
|
/* if we found an image we'll load, reset the counter */
|
|
counter = 0;
|
|
} else {
|
|
if (++counter > settings.failure_limit) {
|
|
return false;
|
|
}
|
|
}
|
|
});
|
|
|
|
}
|
|
|
|
if(options) {
|
|
/* Maintain BC for a couple of versions. */
|
|
if (undefined !== options.failurelimit) {
|
|
options.failure_limit = options.failurelimit;
|
|
delete options.failurelimit;
|
|
}
|
|
if (undefined !== options.effectspeed) {
|
|
options.effect_speed = options.effectspeed;
|
|
delete options.effectspeed;
|
|
}
|
|
|
|
$.extend(settings, options);
|
|
}
|
|
|
|
/* Cache container as jQuery as object. */
|
|
$container = (settings.container === undefined ||
|
|
settings.container === window) ? $window : $(settings.container);
|
|
|
|
/* Fire one scroll event per scroll. Not one scroll event per image. */
|
|
if (0 === settings.event.indexOf("scroll")) {
|
|
$container.bind(settings.event, function() {
|
|
return update();
|
|
});
|
|
}
|
|
|
|
this.each(function() {
|
|
var self = this;
|
|
var $self = $(self);
|
|
|
|
self.loaded = false;
|
|
|
|
/* If no src attribute given use data:uri. */
|
|
if ($self.attr("src") === undefined || $self.attr("src") === false) {
|
|
if ($self.is("img")) {
|
|
$self.attr("src", settings.placeholder);
|
|
}
|
|
}
|
|
|
|
/* When appear is triggered load original image. */
|
|
$self.one("appear", function() {
|
|
if (!this.loaded) {
|
|
if (settings.appear) {
|
|
var elements_left = elements.length;
|
|
settings.appear.call(self, elements_left, settings);
|
|
}
|
|
$("<img />")
|
|
.bind("load", function() {
|
|
|
|
var original = $self.attr("data-" + settings.data_attribute);
|
|
$self.hide();
|
|
if ($self.is("img")) {
|
|
$self.attr("src", original);
|
|
} else {
|
|
$self.css("background-image", "url('" + original + "')");
|
|
}
|
|
$self[settings.effect](settings.effect_speed);
|
|
|
|
self.loaded = true;
|
|
|
|
/* Remove image from array so it is not looped next time. */
|
|
var temp = $.grep(elements, function(element) {
|
|
return !element.loaded;
|
|
});
|
|
elements = $(temp);
|
|
|
|
if (settings.load) {
|
|
var elements_left = elements.length;
|
|
settings.load.call(self, elements_left, settings);
|
|
}
|
|
})
|
|
.attr("src", $self.attr("data-" + settings.data_attribute));
|
|
}
|
|
});
|
|
|
|
/* When wanted event is triggered load original image */
|
|
/* by triggering appear. */
|
|
if (0 !== settings.event.indexOf("scroll")) {
|
|
$self.bind(settings.event, function() {
|
|
if (!self.loaded) {
|
|
$self.trigger("appear");
|
|
}
|
|
});
|
|
}
|
|
});
|
|
|
|
/* Check if something appears when window is resized. */
|
|
$window.bind("resize", function() {
|
|
update();
|
|
});
|
|
|
|
/* With IOS5 force loading images when navigating with back button. */
|
|
/* Non optimal workaround. */
|
|
if ((/(?:iphone|ipod|ipad).*os 5/gi).test(navigator.appVersion)) {
|
|
$window.bind("pageshow", function(event) {
|
|
if (event.originalEvent && event.originalEvent.persisted) {
|
|
elements.each(function() {
|
|
$(this).trigger("appear");
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
/* Force initial check if images should appear. */
|
|
$(document).ready(function() {
|
|
update();
|
|
});
|
|
|
|
return this;
|
|
};
|
|
|
|
/* Convenience methods in jQuery namespace. */
|
|
/* Use as $.belowthefold(element, {threshold : 100, container : window}) */
|
|
|
|
$.belowthefold = function(element, settings) {
|
|
var fold;
|
|
|
|
if (settings.container === undefined || settings.container === window) {
|
|
fold = (window.innerHeight ? window.innerHeight : $window.height()) + $window.scrollTop();
|
|
} else {
|
|
fold = $(settings.container).offset().top + $(settings.container).height();
|
|
}
|
|
|
|
return fold <= $(element).offset().top - settings.threshold;
|
|
};
|
|
|
|
$.rightoffold = function(element, settings) {
|
|
var fold;
|
|
|
|
if (settings.container === undefined || settings.container === window) {
|
|
fold = $window.width() + $window.scrollLeft();
|
|
} else {
|
|
fold = $(settings.container).offset().left + $(settings.container).width();
|
|
}
|
|
|
|
return fold <= $(element).offset().left - settings.threshold;
|
|
};
|
|
|
|
$.abovethetop = function(element, settings) {
|
|
var fold;
|
|
|
|
if (settings.container === undefined || settings.container === window) {
|
|
fold = $window.scrollTop();
|
|
} else {
|
|
fold = $(settings.container).offset().top;
|
|
}
|
|
|
|
return fold >= $(element).offset().top + settings.threshold + $(element).height();
|
|
};
|
|
|
|
$.leftofbegin = function(element, settings) {
|
|
var fold;
|
|
|
|
if (settings.container === undefined || settings.container === window) {
|
|
fold = $window.scrollLeft();
|
|
} else {
|
|
fold = $(settings.container).offset().left;
|
|
}
|
|
|
|
return fold >= $(element).offset().left + settings.threshold + $(element).width();
|
|
};
|
|
|
|
$.inviewport = function(element, settings) {
|
|
return !$.rightoffold(element, settings) && !$.leftofbegin(element, settings) &&
|
|
!$.belowthefold(element, settings) && !$.abovethetop(element, settings);
|
|
};
|
|
|
|
/* Custom selectors for your convenience. */
|
|
/* Use as $("img:below-the-fold").something() or */
|
|
/* $("img").filter(":below-the-fold").something() which is faster */
|
|
|
|
$.extend($.expr[":"], {
|
|
"below-the-fold" : function(a) { return $.belowthefold(a, {threshold : 0}); },
|
|
"above-the-top" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
|
|
"right-of-screen": function(a) { return $.rightoffold(a, {threshold : 0}); },
|
|
"left-of-screen" : function(a) { return !$.rightoffold(a, {threshold : 0}); },
|
|
"in-viewport" : function(a) { return $.inviewport(a, {threshold : 0}); },
|
|
/* Maintain BC for couple of versions. */
|
|
"above-the-fold" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
|
|
"right-of-fold" : function(a) { return $.rightoffold(a, {threshold : 0}); },
|
|
"left-of-fold" : function(a) { return !$.rightoffold(a, {threshold : 0}); }
|
|
});
|
|
|
|
})(jQuery, window, document); |