jquery.inview.min.js

/**
 * author Remy Sharp
 * url http://remysharp.com/2009/01/26/element-in-view-event-plugin/
 * fork https://github.com/zuk/jquery.inview
 */
(function(e){function m(){var b=window.innerHeight;if(b)return b;var f=document.compatMode;if(f||!e.support.boxModel)b="CSS1Compat"===f?document.documentElement.clientHeight:document.body.clientHeight;return b}var n=function(b,f){function e(){null!==a?c=!0:(c=!1,b(),a=setTimeout(function(){a=null;c&&e()},f))}var c=!1,a=null;return e}(function(){var b=window.pageYOffset||document.documentElement.scrollTop||document.body.scrollTop,f=b+m(),g=[];e.each(e.cache,function(){this.events&&this.events.inview&&
g.push(this.handle.elem)});e(g).each(function(){var c=e(this),a;a=0;for(var d=this;d;d=d.offsetParent)a+=d.offsetTop;var d=c.height(),k=a+d,d=c.data("inview")||!1,h=c.data("offset")||0,g=a>b&&k<f,l=k+h>b&&a<b,h=a-h<f&&k>f;g||l||h||a<b&&k>f?(a=h?"top":l?"bottom":"both",d&&d===a||(c.data("inview",a),c.trigger("inview",[!0,a]))):!g&&d&&(c.data("inview",!1),c.trigger("inview",[!1]))})},100);e(window).on("checkInView.inview click.inview ready.inview scroll.inview resize.inview",n)})(jQuery);