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HTML DOM id Property
 Complete Button Object Reference
Definition and Usage
The id property sets or returns the id of the button.
Syntax
Example
This example alerts the id of the button:
<html>
<head>
<script type="text/javascript">
function alertValue()
{
alert(document.getElementById("myButton").value)
}
</script>
</head>
<body>
<form>
<input type="button" value="Click me!" id="myButton"
onclick="alertValue()" />
</form>
</body>
</html>
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Try-It-Yourself Demos
Alert id, type, and value of a Button + disable button
Complete Button Object Reference
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