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POJQuery works in Firefox, but not in IE
 

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    <p>Anyone know why the following JQuery expression works in Firefox but not in IE or Chrome?</p> <pre><code>$('form :hidden:last').attr('name') </code></pre> <p>An alert statement reveals that in IE the expression is undefined.</p> <p>UPDATE: Here is some HTML that fails.</p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;script type="text/javascript" src="/js/jquery-1.3.2.min.js"&gt; &lt;/script&gt; &lt;script type="text/javascript"&gt; 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 &gt; 2 ) { rows.filter(":last").remove(); $('form :hidden:last').val(''); } else { alert('Cannot remove any more rows'); } } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;form autocomplete="off" method="post" action=""&gt; &lt;div&gt; &lt;input type="button" onclick="addItem(); return false;" value="Add Item" /&gt; &lt;input type="button" onclick="removeItem(); return false;" value="Remove Last Item" /&gt; &lt;/div&gt; &lt;table&gt; &lt;tr&gt; &lt;th&gt;Name&lt;/th&gt; &lt;th&gt;Weight&lt;/th&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;input type="text" name="input1" id="input1" value="" /&gt; &lt;/td&gt; &lt;td&gt; &lt;input type="text" name="input2" id="input2" value="" /&gt; &lt;select name="input3" class="unitsInput"&gt; &lt;option value="0"&gt; Pounds &lt;/option&gt; &lt;option value="1"&gt; Kilograms &lt;/option&gt; &lt;/select&gt; &lt;/td&gt; &lt;td&gt; &lt;input type="hidden" name="input4" id="input4" value="" /&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;div&gt; &lt;select name="input8"&gt; &lt;option value="0"&gt;0&lt;/option&gt; &lt;option value="1"&gt;1&lt;/option&gt; &lt;option value="2"&gt;2&lt;/option&gt; &lt;/select&gt; &lt;/div&gt; &lt;div&gt; &lt;input type="submit" name="submit" id="submit" value="Submit" /&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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      1. POJQuery works in Firefox, but not in IE
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    1. COSupply some HTML and you will get this answered lickety-split.
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    2. COIn the code I added, the first line in addItem returns undefined.
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