JQuery works in Firefox, but not in IE
Question
Anyone know why the following JQuery expression works in Firefox but not in IE or Chrome?
$('form :hidden:last').attr('name')
An alert statement reveals that in IE the expression is undefined.
UPDATE: Here is some HTML that fails.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<script type="text/javascript" src="/js/jquery-1.3.2.min.js">
</script>
<script type="text/javascript">
function addItem() {
var v = $('form :hidden:last').attr('name');
var n = /(.*)input/.exec(v);
var newPrefix;
if ( n[1].length == 0 ) {
newPrefix = '1';
} else {
newPrefix = parseInt(n[1])+1;
}
var lastExercise = $('form tr:last select:first').attr('value');
var oldElem = $('form tr:last');
var newElem = oldElem.clone(true);
var lastHidden = $('form :hidden:last');
lastHidden.val(newPrefix);
var pat = '=\"'+n[1]+'input';
newElem.html(newElem.html().replace(new RegExp(pat, 'g'), '=\"'+newPrefix+'input'));
newElem.appendTo('table');
$('form tr:last select:first').attr('value', lastExercise);
$('form :hidden:last').val('');
}
function removeItem() {
var rows = $('form tr');
if ( rows.length > 2 ) {
rows.filter(":last").remove();
$('form :hidden:last').val('');
} else {
alert('Cannot remove any more rows');
}
}
</script>
</head>
<body>
<form autocomplete="off" method="post" action="">
<div>
<input type="button" onclick="addItem(); return false;" value="Add Item" />
<input type="button" onclick="removeItem(); return false;" value="Remove Last Item" />
</div>
<table>
<tr>
<th>Name</th>
<th>Weight</th>
</tr>
<tr>
<td>
<input type="text" name="input1" id="input1" value="" />
</td>
<td>
<input type="text" name="input2" id="input2" value="" />
<select name="input3" class="unitsInput">
<option value="0">
Pounds
</option>
<option value="1">
Kilograms
</option>
</select>
</td>
<td>
<input type="hidden" name="input4" id="input4" value="" />
</td>
</tr>
</table>
<div>
<select name="input8">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
</select>
</div>
<div>
<input type="submit" name="submit" id="submit" value="Submit" />
</div>
</form>
</body>
</html>
4 answers
solution1
2 2009-06-01 03:42:20
Is your JQuery wrapped in the a $(document).ready( ... ) ?
For example:
$(document).ready(function() {
$('form :hidden:last').attr('name')
});
It is essential to do this to ensure that the DOM has fully loaded before your JQuery code starts executing. Otherwise, there is no DOM (document) for it to query.
solution2
1 2009-06-01 03:39:24
Do you run this query after DOM is fully loaded and using the latest version of jQuery? The above example from Dan works fine even in IE6 for me.
solution3
0 2009-06-01 03:22:19
I was able to get it to run fine in IE7.
What does your HTML look like?
Here is what mine looks like:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script type="text/javascript" src="jquery-1.3.2.min.js"></script>
</head>
<body>
<form action="" method="get" name="testform">
<input name="bob" type="hidden" value="" />
<input name="steve" type="hidden" value="" />
<input name="william" type="hidden" value="" /></form>
<script type="text/javascript">
$(document).ready(function(){
alert($('form :hidden:last').attr('name'));
});
</script>
</body>
</html>
solution4
0 2009-06-01 16:18:05
It appears that IE treats the option elements at the end as hidden. Changing all the "...:hidden..." selectors in the javascript to "...input:hidden..." seems to solve the problem.
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