Bearbeiten von „JQuery Appear - Plugin“

Appear / Dissapear Events, wenn ein Element im Viewport auftaucht / Verschwindet

This plugin can be used to prevent unnecessary processeing for content that is hidden or is outside of the browser viewport.

'''It implements a custom appear/disappear events which are fired when an element became visible/invisible in the browser viewport.'''

Neue Version: https://github.com/morr/jquery.appear

Alte Version:
<syntaxhighlight lang="javascript">
/*
 * jQuery.appear
 * http://code.google.com/p/jquery-appear/
 *
 * Copyright (c) 2009 Michael Hixson
 * Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php)
*/
(function($){$.fn.appear=function(f,o){var s=$.extend({one:true},o);return this.each(function(){var t=$(this);t.appeared=false;if(!f){t.trigger('appear',s.data);return;}var w=$(window);var c=function(){if(!t.is(':visible')){t.appeared=false;return;}var a=w.scrollLeft();var b=w.scrollTop();var o=t.offset();var x=o.left;var y=o.top;if(y+t.height()>=b&&y<=b+w.height()&&x+t.width()>=a&&x<=a+w.width()){if(!t.appeared)t.trigger('appear',s.data);}else{t.appeared=false;}};var m=function(){t.appeared=true;if(s.one){w.unbind('scroll',c);var i=$.inArray(c,$.fn.appear.checks);if(i>=0)$.fn.appear.checks.splice(i,1);}f.apply(this,arguments);};if(s.one)t.one('appear',s.data,m);else t.bind('appear',s.data,m);w.scroll(c);$.fn.appear.checks.push(c);(c)();});};$.extend($.fn.appear,{checks:[],timeout:null,checkAll:function(){var l=$.fn.appear.checks.length;if(l>0)while(l--)($.fn.appear.checks[l])();},run:function(){if($.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 u=$.fn[n];if(u){$.fn[n]=function(){var r=u.apply(this,arguments);$.fn.appear.run();return r;}}});})(jQuery);
</syntaxhighlight>