How to overlay a div (or any element) over a table row (tr)?
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Published on 2010-06-17T19:46:32Z
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2010/06/17
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I'd like to overlay a div (or any element that'll work) over a table row (tr tag) that happens to have more than one column.
I have tried a few methods, which don't seem to work. I've posted my current code below.
I do get an overlay, but not directly over just the row. I tried setting the overlay top to $divBottom.css('top'), but that is always 'auto'.
So, am I on the right track, or is there a better way of doing it? Utilizing jQuery is fine as you can see.
If I am on the right track, how do I get the div placed correctly? Is the offsetTop an offset in the containing element, the table, and I need to do some math? Any other gotchas I'll run into with that?
<html>
<head>
<title>Overlay Tests</title>
<style>
#rowBottom { outline:red solid 2px }
#divBottom { margin:1em; font-size:xx-large; position:relative; }
#divOverlay { background-color:Silver; text-align:center; position:absolute; z-index:10000; opacity:0.5; }
</style>
</head>
<body>
<p align="center"><a id="lnkDoIt" href="#">Do it!</a></p>
<table width="100%" border="0" cellpadding="10" cellspacing="3" style="position:relative">
<tr>
<td><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p></td>
</tr>
<tr id="rowBottom">
<td><div id="divBottom"><p align="center">This is the bottom text</p></div></td>
</tr>
<tr>
<td><p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p></td>
</tr>
</table>
<div id="divOverlay" style=""><p>This is the overlay div.</p><p id="info"></p></div>
<script src="../includes/javascript/jquery/jquery-1.4.2.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
$('#lnkDoIt').click(function() {
var $divBottom = $('#rowBottom');
var $divOverlay = $('#divOverlay');
var bottomTop = $divBottom.attr('offsetTop');
var bottomLeft = $divBottom.attr('offsetLeft');
var bottomWidth = $divBottom.css('width');
var bottomHeight = $divBottom.css('height');
$divOverlay.css('top', bottomTop);
$divOverlay.css('left', bottomLeft);
$divOverlay.css('width', bottomWidth);
$divOverlay.css('height', bottomHeight);
$('#info').text('Top: ' + bottomTop + ' Left: ' + bottomLeft);
});
});
</script>
</body>
</html>
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