Вопросы Теги

selectedIndex is returning “undefined” as value

Forgive me if this is a stupid question; it's been many years since I've worked with javascript. This is actually javascript and html rendered via PHP in Joomla, but I've tried using the same code in a plain old local HTML file and I'm getting the same error. I have a select field with several options, and onchange I want to set the value of a text field to the value of the selected option. No matter which option I choose, the text field is being set to "undefined". Can anyone help me out? Here's the plain html code:

<html>
<head>
<script type="text/javascript">
function setPrefix(){
    var f = document.adminForm;
    f.prefix.value = f.editprefixes.selectedIndex.value;
}
</script>
</head>
<body>

<form name="adminForm">

<select name="editprefixes" onchange="javascript:setPrefix()">
<option value=1000>1000</option>
<option value=1001>1001</option>
<option value=1005>1005</option>
<option value=1011>1011</option>
<option value=1016>1016</option>
</select>
<br />

<input type="text" name="prefix" value="" />
</form>
</body>
</html>
5
задан EmmyS 25 August 2010 в 16:31
поделиться