HTML DOM multiple Property
 Complete Select Object Reference
Definition and Usage
The multiple property sets or returns whether
or not multiple items can be selected in a dropdown list.
Note: Opera 9 cannot set this property in a script (only return it).
Syntax
selectObject.multiple=true|false
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Example
<html>
<head>
<script type="text/javascript">
function selectMultiple()
{
document.getElementById("mySelect").multiple=true
}
</script>
</head>
<body>
<form>
<select id="mySelect" size="4">
<option>Apple</option>
<option>Pear</option>
<option>Banana</option>
<option>Orange</option>
</select>
<input type="button" onclick="selectMultiple()"
value="Select multiple">
</form>
</body>
</html>
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Try-It-Yourself Demos
Select multiple options in a dropdown list
Complete Select Object Reference
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