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Filename : jquery.appear.js
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(function(root,factory){if(typeof define==='function'&&define.amd){define(['jquery'],factory);}else if(typeof module==='object'&&module.exports){factory(require('jquery'));}else{factory(root.jQuery);}}(this,function($){$.fn.appear=function(fn,options){var settings=$.extend({data:undefined,one:true,accX:0,accY:0},options);return this.each(function(){var t=$(this);t.appeared=false;if(!fn){t.trigger('appear',settings.data);return;}
var w=$(window);var check=function(){if(!t.is(':visible')){t.appeared=false;return;}
var a=w.scrollLeft();var b=w.scrollTop();var o=t.offset();var x=o.left;var y=o.top;var ax=settings.accX;var ay=settings.accY;var th=t.height();var wh=w.height();var tw=t.width();var ww=w.width();if(y+th+ay>=b&&y<=b+wh+ay&&x+tw+ax>=a&&x<=a+ww+ax){if(!t.appeared)t.trigger('appear',settings.data);}else{t.appeared=false;}};var modifiedFn=function(){t.appeared=true;if(settings.one){w.unbind('scroll',check);var i=$.inArray(check,$.fn.appear.checks);if(i>=0)$.fn.appear.checks.splice(i,1);}
fn.apply(this,arguments);};if(settings.one)t.one('appear',settings.data,modifiedFn);else t.bind('appear',settings.data,modifiedFn);w.scroll(check);$.fn.appear.checks.push(check);(check)();});};$.extend($.fn.appear,{checks:[],timeout:null,checkAll:function(){var length=$.fn.appear.checks.length;if(length>0)while(length--)($.fn.appear.checks[length])();},run:function(){if($.fn.appear.timeout)clearTimeout($.fn.appear.timeout);$.fn.appear.timeout=setTimeout($.fn.appear.checkAll,20);}});$.each(['append','prepend','after','before','attr','removeAttr','addClass','removeClass','toggleClass','remove','css','show','hide'],function(i,n){var old=$.fn[n];if(old){$.fn[n]=function(){var r=old.apply(this,arguments);$.fn.appear.run();return r;}}});}));