HTML DOM selectedIndex Property
 Complete Select Object Reference
Definition and Usage
The selectedIndex property sets or returns the index of the selected option in a dropdown list.
Note: If the dropdown list allows multiple selections it will only return the index of the first option selected.
Syntax
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selectObject.selectedIndex=number
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Example
The following example alerts the index of the selected option:
<html>
<head>
<script type="text/javascript">
function getIndex()
{
var x=document.getElementById("mySelect")
alert(x.selectedIndex)
}
</script>
</head>
<body>
<form>
Select your favorite fruit:
<select id="mySelect">
<option>Apple</option>
<option>Orange</option>
<option>Pineapple</option>
<option>Banana</option>
</select>
<br /><br />
<input type="button" onclick="getIndex()"
value="Alert index of selected option">
</form>
</body>
</html>
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Try-It-Yourself Demos
Set the text of a selected option in a dropdown list
Remove options from a dropdown list
Complete Select Object Reference
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