Javascript DOM onscroll Event toggle class on scroll positions

Description

Javascript DOM onscroll Event toggle class on scroll positions

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<!DOCTYPE html>
<html>
<head>
<style>
.test {/*  w w w.j  a v a 2 s .c o m*/
  background-color: yellow;
}
</style>
</head>
<body style="height:1500px">

<p>Scroll down this page</p>

<p id="myP" style="position:fixed">
When you have scrolled 50 pixels from the top of this page, 
add the class "test" to this paragraph. 
Scroll up again to remove the class.
</p>

<script>
window.onscroll = function() {myFunction()};

function myFunction() {
  if (document.body.scrollTop > 50 || document.documentElement.scrollTop > 50) {
    document.getElementById("myP").className = "test";
  } else {
    document.getElementById("myP").className = "";
  }
}
</script>

</body>
</html>



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