HTML DOM disabled Property
 Complete Option Object Reference
Definition and Usage
The disabled property sets or returns whether or not an option in a dropdown
list should be disabled by default.
Note: The disabled attribute does not work properly in IE.
Syntax
optionObject.disabled=true|false
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Example
The following example alerts if the chosen fruit is disabled by default:
<html>
<head>
<script type="text/javascript">
function alertDefaultDisabled()
{
var x=document.getElementById("mySelect").selectedIndex;
var y=document.getElementsByTagName("option");
alert("Is " + y[x].text + " disabled by default? " + y[x].disabled);
}
</script>
</head>
<body>
<form>
Select your favorite fruit:
<select id="mySelect">
<option>Apple</option>
<option>Orange</option>
<option disabled="disabled">Pineapple</option>
<option>Banana</option>
</select>
<br />
<br />
<input type="button" onclick="alertDefaultDisabled()"
value="Is the chosen fruit disabled by default?">
</form>
</body>
</html>
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Try-It-Yourself Demos
Check if an option is disabled by default
Disable an option by id
Complete Option Object Reference
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