javascript - Detecting a DIV that is mostly in the viewport/center as you scroll -


trying know when element visible in viewport , in center. i'd have other divs fade off keeping more dominant div @ full opacity scroll.

i found this: http://patik.com/code/within-viewport/ it's pixel , doesn't have logic require work in image below.

enter image description here

you need method tested whether element within bounds of page. there plugins such remy sharp's element in-view event plugin or this digital fusion need test if element in view , add class it.

all relatively simple (although confess have not tested x-browser ymmv):

function testinview($el){     var wtop = $(window).scrolltop();     var wbot = wtop + $(window).height();     var etop = $el.offset().top;     var ebot = etop + $el.height();     return ((ebot <= wbot) && (etop >= wtop)); } function setinview(){     $("div").each(function(){//testing every div (you might want more specific in implementation)         var $zis = $(this);         $zis.removeclass("inview");         if(testinview($zis)){            $zis.addclass("inview");            }     }); } $(document).scroll(function(){     setinview(); }); $(document).resize(function(){     setinview(); }); $(document).ready(function(){     setinview(); });

here's jsfiddle


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