JavaScript calculate percentage when user scroll web page 


<!doctype html>
<html>
<head>
    <title>Color Changing</title>
    <style type="text/css">
        #percentage
        {
            position: fixed;
        }

    </style>
</head>
<body>
    <div id="percentage"></div>
    <div style="height: 4000px;"></div>
</body>

<script type="text/javascript">
    window.onscroll = function(){
        var heightOfWindow = window.innerHeight;
        var contentScrolled = window.pageYOffset;
        var bodyHeight = window.document.getElementsByTagName("body")[0].offsetHeight;
        if(bodyHeight - contentScrolled <= heightOfWindow)
       {
           window.document.getElementById("percentage").innerHTML = "100%";
       }
       else
       {
           var total = bodyHeight - heightOfWindow;
           var got = contentScrolled;
           window.document.getElementById("percentage").innerHTML = parseInt((got/total) * 100);
       }
   }
</script>

</html>

Demo jsfiddle

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