243 lines
8.8 KiB
JavaScript
243 lines
8.8 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) 2007-2015 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: 1.9.7
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*
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*/
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(function($, window, document, undefined) {
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var $window = $(window);
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$.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 : false,
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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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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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$this.trigger("appear");
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/* if we found an image we'll load, reset the counter */
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counter = 0;
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} else {
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if (++counter > settings.failure_limit) {
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return false;
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}
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}
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});
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}
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if(options) {
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/* Maintain BC for a couple of versions. */
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if (undefined !== options.failurelimit) {
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options.failure_limit = options.failurelimit;
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delete options.failurelimit;
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}
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if (undefined !== options.effectspeed) {
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options.effect_speed = options.effectspeed;
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delete options.effectspeed;
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}
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$.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() {
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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 = $(self);
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self.loaded = false;
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/* If no src attribute given use data:uri. */
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if ($self.attr("src") === undefined || $self.attr("src") === false) {
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if ($self.is("img")) {
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$self.attr("src", settings.placeholder);
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}
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}
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/* When appear is triggered load original image. */
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$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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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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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", $self.attr("data-" + settings.data_attribute));
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}
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});
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/* When wanted event is triggered load original image */
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/* by triggering appear. */
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if (0 !== settings.event.indexOf("scroll")) {
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$self.bind(settings.event, function() {
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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() {
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update();
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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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/* 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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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.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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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 = $(settings.container).offset().left + $(settings.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 = $(settings.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 = $(settings.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 !$.rightoffold(element, settings) && !$.leftofbegin(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() or */
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/* $("img").filter(":below-the-fold").something() which is faster */
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$.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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})(jQuery, window, document);
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