1/* 2 * jQuery appear plugin 3 * 4 * Copyright (c) 2012 Andrey Sidorov 5 * licensed under MIT license. 6 * 7 * https://github.com/morr/jquery.appear/ 8 * 9 * Version: 0.3.3 10 */ 11(function($){var selectors=[];var check_binded=false;var check_lock=false;var defaults={interval:250,force_process:false};var $window=$(window);var $prior_appeared;function process(){check_lock=false;for(var index=0;index<selectors.length;index++){var $appeared=$(selectors[index]).filter(function(){return $(this).is(":appeared")});$appeared.trigger("appear",[$appeared]);if($prior_appeared){var $disappeared=$prior_appeared.not($appeared);$disappeared.trigger("disappear",[$disappeared])}$prior_appeared=$appeared}}$.expr[":"]["appeared"]=function(element){var $element=$(element);if(!$element.is(":visible"))return false;var window_left=$window.scrollLeft();var window_top=$window.scrollTop();var offset=$element.offset();var left=offset.left;var top=offset.top;if(top+$element.height()>=window_top&&top-($element.data("appear-top-offset")||0)<=window_top+$window.height()&&left+$element.width()>=window_left&&left-($element.data("appear-left-offset")||0)<=window_left+$window.width())return true;else return false};$.fn.extend({appear:function(options){var opts=$.extend({},defaults,options||{});var selector=this.selector||this;if(!check_binded){var on_check=function(){if(check_lock)return;check_lock=true;setTimeout(process,opts.interval)};$(window).scroll(on_check).resize(on_check);check_binded=true}if(opts.force_process)setTimeout(process,opts.interval);selectors.push(selector);return $(selector)}});$.extend({force_appear:function(){if(check_binded){process();return true}return false}})})(jQuery);
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