jquery.inview.min.js

!function(t){function e(){var e,i,n={height:a.innerHeight,width:a.innerWidth};return n.height||(e=r.compatMode,(e||!t.support.boxModel)&&(i="CSS1Compat"===e?f:r.body,n={height:i.clientHeight,width:i.clientWidth})),n}function i(){return{top:a.pageYOffset||f.scrollTop||r.body.scrollTop,left:a.pageXOffset||f.scrollLeft||r.body.scrollLeft}}function n(){var n,l=t(),r=0;if(t.each(d,function(t,e){var i=e.data.selector,n=e.$element;l=l.add(i?n.find(i):n)}),n=l.length)for(o=o||e(),h=h||i();n>r;r++)if(t.contains(f,l[r])){var a,c,p,s=t(l[r]),u={height:s.height(),width:s.width()},g=s.offset(),v=s.data("inview");if(!h||!o)return;g.top+u.height>h.top&&g.top<h.top+o.height&&g.left+u.width>h.left&&g.left<h.left+o.width?(a=h.left>g.left?"right":h.left+o.width<g.left+u.width?"left":"both",c=h.top>g.top?"bottom":h.top+o.height<g.top+u.height?"top":"both",p=a+"-"+c,v&&v===p||s.data("inview",p).trigger("inview",[!0,a,c])):v&&s.data("inview",!1).trigger("inview",[!1])}}var o,h,l,d={},r=document,a=window,f=r.documentElement,c=t.expando;t.event.special.inview={add:function(e){d[e.guid+"-"+this[c]]={data:e,$element:t(this)},l||t.isEmptyObject(d)||(l=setInterval(n,250))},remove:function(e){try{delete d[e.guid+"-"+this[c]]}catch(i){}t.isEmptyObject(d)&&(clearInterval(l),l=null)}},t(a).bind("scroll resize scrollstop",function(){o=h=null}),!f.addEventListener&&f.attachEvent&&f.attachEvent("onfocusin",function(){h=null})}(jQuery);