getElementById
- The getElementById() method returns an element with a specified value.
- The getElementById() method returns null if the element does not exist.
- The getElementById() method is one of the most common methods in the HTML DOM. It is used almost every time you want to read or edit an HTML element.
- If two or more elements with the same id exist, getElementById() returns the first.
Example:
<!DOCTYPE html>
<html>
<head>
<title>getElementById</title>
<script type="text/javascript">
function getcube()
{
var number=document.getElementById("number").value;
alert("Cube= "+number*number*number);
}
</script>
</head>
<form>
Enter No:<input type="text" id="number" name="number"/><br/>
<input type="button" value="cube" onClick="getcube()"/>
</form>
<body>
</body>
</html>
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