Web-Programming-Lab/lab2a.html at master · ritesh-29/Web-Programming-Lab · GitHub

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<?xml version="1.0" encoding="UTF-80"?>
<!DOCTYPE html PUBLIC"-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<script type="text/JavaScript">
			function validateUsn(elem)
			{
				var alphaExp=/^[1-4][a-zA-Z][a-zA-Z][0-9][0-9][a-zA-Z][a-zA-Z][0-9][0-9][0-9]$/;
				var str=elem.value;
				if(!elem.value.match(alphaExp))
				{
					alert("Invalid usn");
					return false;
				}
				else if(str.length!=10)
				{
					alert("Invalid usn");
					return false;
				}
				else
				{
					alert("Valid USN");
					return true;
				}
			}
		</script>
	</head>
	<body>
		<form>
			<label>Enter the Usn:<input type="text" id="usn"/></label>
			<input type="submit" onclick="validateUsn(document.getElementById('usn'))" value="Check Field"/>
		</form>
	</body>
</html>