javascript - I can't get my navigation to change on scroll -


i know repeat question, trying navigation bar change styling using javascript/jquery/css making jquery add , remove classes depending on position of scrollbar, yet no prevail. huge noob jquery. tell me if these wrong code. have searched hours , can't find , error. here working example: http://codepen.io/anon/pen/qbwojv , here code:

// on scroll,   $(window).on('scroll',function(){        // round here reduce little workload      stop = math.round($(window).scrolltop());      if (stop > 50) {          $('.nav').addclass('passed-main');      } else {          $('.nav').removeclass('passed-main');      }
.nav              {                  background-color: #000000;                  opacity: 0.3;                  width: 100%;                  height: 40px;                  position: fixed;                  top: 0;                  z-index: 2000;                  transition: 0.3s;              }              .nav.past-main              {                  background-color: #ffffff;                  opacity: 1;              }
<div class="nav">          </div>

perhaps example want achieve, , when try code above, it's not working.

here's problem code in snippet:

  1. you forgot close function

    // on scroll,  $(window).on('scroll',function(){         // round here reduce little workload     stop = math.round($(window).scrolltop());     if (stop > 50) {         $('.nav').addclass('passed-main');     } else {         $('.nav').removeclass('passed-main');     } }); // forgot close function here

  2. you add/remove class passed-main while in css you're using class selector .nav.past-main

  3. your window doesn't have scrollbar, need add css test if works

    body {     height: 1500px; }

  4. you forgot include jquery in snippet.

here's working updated snippet

// on scroll,   $(window).on('scroll', function () {        // round here reduce little workload      stop = math.round($(window).scrolltop());      if (stop > 50) {          $('.nav').addclass('past-main');      } else {          $('.nav').removeclass('past-main');      }  });
.nav {      background-color: #000000;      opacity: 0.3;      width: 100%;      height: 40px;      position: fixed;      top: 0;      z-index: 2000;      transition: 0.3s;  }  .nav.past-main {      background-color: #ffffff;      opacity: 1;  }  body {      height: 1500px;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>  <div class="nav"></div>


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