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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) 2007-2013 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: 1.9.1
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+ *
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+ */
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+
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+(function($, window, document, undefined) {
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+ var $window = $(window);
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+
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+ $.fn.lazyload = function(options) {
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+ var elements = this;
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+ var $container;
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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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+ placeholder : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC"
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+ };
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+
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+ function update() {
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+ var counter = 0;
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+
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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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+ /* if we found an image we'll load, reset the counter */
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+ counter = 0;
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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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+ }
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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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+
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+ $.extend(settings, options);
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+ }
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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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+
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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() {
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+ return update();
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+ });
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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 = $(self);
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+
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+ self.loaded = false;
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+
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+ /* If no src attribute given use data:uri. */
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+ if ($self.attr("src") === undefined || $self.attr("src") === false) {
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+ if ($self.is("img")) {
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+ $self.attr("src", settings.placeholder);
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+ }
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+ }
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+
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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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+
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+ var original = $self.attr("data-" + settings.data_attribute);
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+ $self.hide();
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+ if ($self.is("img")) {
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+ $self.attr("src", original);
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+ } else {
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+ $self.css("background-image", "url('" + original + "')");
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+ }
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+ $self[settings.effect](settings.effect_speed);
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+
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+ self.loaded = true;
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+
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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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+
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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.attr("data-" + settings.data_attribute));
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+ }
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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() {
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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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+
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+ /* Check if something appears when window is resized. */
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+ $window.bind("resize", function() {
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+ update();
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+ });
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+
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+ /* With IOS5 force loading images when navigating with back button. */
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+ /* Non optimal workaround. */
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+ if ((/(?:iphone|ipod|ipad).*os 5/gi).test(navigator.appVersion)) {
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+ $window.bind("pageshow", function(event) {
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+ if (event.originalEvent && event.originalEvent.persisted) {
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+ elements.each(function() {
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+ $(this).trigger("appear");
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+ });
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+ }
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+ });
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+ }
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+
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+ /* Force initial check if images should appear. */
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+ $(document).ready(function() {
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+ update();
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+ });
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+
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+ return this;
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+ };
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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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+
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+ $.belowthefold = function(element, settings) {
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+ var fold;
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+
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+ if (settings.container === undefined || settings.container === window) {
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+ fold = (window.innerHeight ? window.innerHeight : $window.height()) + $window.scrollTop();
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+ } else {
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+ fold = $(settings.container).offset().top + $(settings.container).height();
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+ }
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+
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+ return fold <= $(element).offset().top - settings.threshold;
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+ };
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+
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+ $.rightoffold = function(element, settings) {
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+ var fold;
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+
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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 = $(settings.container).offset().left + $(settings.container).width();
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+ }
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+
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+ return fold <= $(element).offset().left - settings.threshold;
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+ };
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+
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+ $.abovethetop = function(element, settings) {
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+ var fold;
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+
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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 = $(settings.container).offset().top;
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+ }
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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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+
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+ $.leftofbegin = function(element, settings) {
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+ var fold;
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+
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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 = $(settings.container).offset().left;
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+ }
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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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+
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+ $.inviewport = function(element, settings) {
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+ return !$.rightoffold(element, settings) && !$.leftofbegin(element, settings) &&
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+ !$.belowthefold(element, settings) && !$.abovethetop(element, settings);
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+ };
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+
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+ /* Custom selectors for your convenience. */
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+ /* Use as $("img:below-the-fold").something() or */
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+ /* $("img").filter(":below-the-fold").something() which is faster */
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+
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+ $.extend($.expr[":"], {
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+ "below-the-fold" : function(a) { return $.belowthefold(a, {threshold : 0}); },
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+ "above-the-top" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
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+ "right-of-screen": function(a) { return $.rightoffold(a, {threshold : 0}); },
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+ "left-of-screen" : function(a) { return !$.rightoffold(a, {threshold : 0}); },
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+ "in-viewport" : function(a) { return $.inviewport(a, {threshold : 0}); },
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+ /* Maintain BC for couple of versions. */
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+ "above-the-fold" : function(a) { return !$.belowthefold(a, {threshold : 0}); },
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+ "right-of-fold" : function(a) { return $.rightoffold(a, {threshold : 0}); },
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+ "left-of-fold" : function(a) { return !$.rightoffold(a, {threshold : 0}); }
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+ });
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+
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+})(jQuery, window, document);
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