How to reposition a div inside another?

I want to be able to center the div 'testDiv' inside the parent div 'testContainer' (which has a height of 400, but for the sake of simplification I just wrote 400 in as a constant. I'm very new to javascript so I have little idea of what I'm doing wrong.

CSS:

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body {

    overflow-x: hidden;

    background-color: #ededed;

}

#testContainer {

    height: 400px;

    width: 1100px;

    background-color: #ffffff;
 
    margin-top: -8px;

    margin-left: auto;

    margin-right: auto;

}

#testDiv {

    color: black;

    text-align: left;

    font-family: "Helvetica Neue";

    font-style: italic;

    font-weight: bold;

    font-size: 24px;

    height: auto;

    max-height: 400px;

    width: 500px;

}

HTML/javascript:

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<html>

<head>

    <link rel="stylesheet" type="text/css" href="style.css" media="screen"/>

</head>

<body>

<div id="testContainer">

    <div id="testDiv">"Here is a sample of text which gives offsetHeight a real value."</div>

</div>
 
<script language="javascript" type="text/javascript">

    var divH = document.getElementById('testDiv').offsetHeight;

    var divT = (400-document.getElementById('testDiv').offsetTop)/2;

    document.getElementById('testDiv').offsetTop = divT;

</script>
 
</body>

</html>

Jan 29 '11 #1

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1713

JKing

1,206

Expert 1GB

You cannot set the offsetTop property. It only returns the value.

Try setting a top margin instead.

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document.getElementById('testDiv').style.marginTop = divT;

Also there are CSS methods out there for centering an element vertically.

Feb 1 '11 #2

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