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POAdding/Deleting Options Fails in Firefox Only
 

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  1. POAdding/Deleting Options Fails in Firefox Only
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    <p>I have a simple webpage that adds &amp; deletes options from a select element dynamically. The code works correctly for Chrome &amp; IE, but it fails in Firefox(when I click add nothing happens &amp; the delete button doesn't even show up?)</p> <p><strong>What do you think I am doing wrong?</strong></p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;&lt;!-- InstanceBegin template="/Templates/homepage.dwt" codeOutsideHTMLIsLocked="false" --&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt; &lt;title&gt;&lt;/title&gt; &lt;script LANGUAGE="JavaScript" type = "text/javascript"&gt; &lt;!-- function addOption() { var listbox = document.getElementById( "listbox" ); var lastIndex = listbox.options.length-1; var newOption = document.createElement( "option" ); newOption.text = "New"; newOption.value = "New"; try { listbox.add( newOption, lastIndex ); // standards compliant; doesn't work in IE } catch (ex) { listbox.add( newOption, listbox.selectedIndex ); // IE only alert( "In addOption(): " + ex ); } } function deleteOption() { //alert( "1" ); var listbox = document.getElementById( "listbox" ); var lastIndex = listbox.options.length-1; if ( lastIndex &lt; 0 ) return; listbox.remove( lastIndex ); //alert( "2" ); } --&gt; &lt;/script&gt; &lt;style type="text/css" media="all"&gt; &lt;!-- div { text-align: center; } button { width: 100px; height: 20px; } #listbox { width: 200px; height: 200px; --&gt; &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;div&gt; &lt;select id="listbox" multiple="multiple"&gt; &lt;option&gt;Test&lt;/option&gt; &lt;/select&gt; &lt;button value="Add" onclick="addOption()"/&gt; &lt;button value="Delete" onclick="deleteOption()"/&gt; &lt;/div&gt; &lt;/body&gt; &lt;!-- InstanceEnd --&gt; &lt;/html&gt; </code></pre>
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