jquery.appear.min.js

!function(a){a.fn.disappear=function(e,r){var t=a.extend({data:void 0},r);this.each(function(){var r=a(this);return r.bind("disappear",e,t.data),e?void 0:void r.trigger("disappear",t.data)})},a.fn.appear=function(e,r){var t=a.extend({data:void 0,one:!0},r);return this.each(function(){var r=a(this);if(r.appeared=!1,!e)return void r.trigger("appear",t.data);var p=a(window),n=function(){if(!r.is(":visible"))return void(r.appeared=!1);var a=p.scrollLeft(),e=p.scrollTop(),n=r.offset(),i=n.left,o=n.top;o+r.height()>=e&&o<=e+p.height()&&i+r.width()>=a&&i<=a+p.width()?r.appeared||r.trigger("appear",t.data):(r.appeared&&r.trigger("disappear",t.data),r.appeared=!1)},i=function(){if(r.appeared=!0,t.one){p.unbind("scroll",n);var i=a.inArray(n,a.fn.appear.checks);i>=0&&a.fn.appear.checks.splice(i,1)}e.apply(this,arguments)};t.one?r.one("appear",t.data,i):r.bind("appear",t.data,i),p.scroll(n),a.fn.appear.checks.push(n),n()})},a.extend(a.fn.appear,{checks:[],timeout:null,checkAll:function(){var e=a.fn.appear.checks.length;if(e>0)for(;e--;)a.fn.appear.checks[e]()},run:function(){a.fn.appear.timeout&&clearTimeout(a.fn.appear.timeout),a.fn.appear.timeout=setTimeout(a.fn.appear.checkAll,20)}}),a.each(["append","prepend","after","before","attr","removeAttr","addClass","removeClass","toggleClass","remove","css","show","hide"],function(e,r){var t=a.fn[r];t&&(a.fn[r]=function(){var e=t.apply(this,arguments);return a.fn.appear.run(),e})})}(jQuery);