Jonny Cerveza Jonny Cerveza - 18 days ago 6
Javascript Question

Can't get scrollTop() to work in both Chrome & Firefox

I am having trouble getting the scrollTop() method to work in both Firefox and Chrome. I used

$('body, html').scrollTop();
however, it doesn't work in Chrome. Only
$('body').scrollTop();
works in Chrome. Any thoughts would be greatly appreciated. Below is my code.

<!DOCTYPE html>
<html>
<head>
<title>Demo</title>
<style type="text/css">
body {
height: 2000px;
}

#light {
display: block;
position: fixed;
top: 50%;
left: 50%;
margin-left: -400px;
margin-top: -200px;
width: 800px;
height: 400px;
background-color: blue;
z-index:1002;
overflow: auto;
}
</style>
</head>

<body>
<div id="light">
</div>

<!-- Used the google jQuery link for ease of use in this example -->
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$(window).scroll(function () {
var offset = $('body, html').scrollTop();
var view = $(window).height();
var total = $(document).height();
var percent = 1-(offset / (total - view));
var widthFactor = 800*percent;
var marginFactor = -(400*percent)

if(percent > 0.33){
$("#light").css({ "width" : widthFactor,
"margin-left" : marginFactor});
};
});
});
</script>
</body>
</html>

Answer

Use the document object instead

$(document).scrollTop();
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