HTML DOM length Property
 Complete Select Object Reference
Definition and Usage
The length property returns the number of options in a dropdown list.
Syntax
selectObject.length=number
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Example
<html>
<head>
<script type="text/javascript">
function getLength()
{
alert(document.getElementById("mySelect").length)
}
</script>
</head>
<body>
<form>
<select id="mySelect">
<option>Apple</option>
<option>Pear</option>
<option>Banana</option>
<option>Orange</option>
</select>
<input type="button" onclick="getLength()"
value="How many options in the list?">
</form>
</body>
</html>
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Try-It-Yourself Demos
Get the number of options in the dropdown list
Complete Select Object Reference
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