jquery - Can't figure out why this doesn't work -

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$(function () { // document ready     $(window).scroll(function() {         var top_offset = $('body').offset().top;         if ((top_offset <= 650)) {              $('.fluid-width-video-wrapper').addclass('fluid-width-video-wrapper-bottom');          } else {           $('.fluid-width-video-wrapper').removeclass('fluid-width-video-wrapper-bottom');         }      }); });

i literally can't figure out why doesn't work, should add class .fluid-width-video-wrapper if page scrolled more 650px, or remove class if isn't.

can show me my-no-doubt idiotic mistake here?

offset gives top , left pixel offsets of element relative document.

since body element starts @ top left corner, it'll give top:0 , left:0 99% of time, unless you've done special body tag in css.

what want $(window).scrolltop()

which tells how far down page have scrolled.


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