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Make a form required

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml">	<head>		<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />		<title>Untitled Document</title>		<script type="text/javascript" language="javascript">			function check() {				var elem = document.getElementById('c1');				if(elem.value == 123) {					alert('Right answer');				} else {					alert('Wrong answer');				}			}		</script>	</head>	<body>		<input type="text" id="c1" value="123" />		<input type="submit" onclick="check();" />	</body></html>

Look at this. This is not a secure way to do this kind of check. Use AJAX or only PHP but in this case the page should be reloaded automatically.

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Yeah the most secure way to make form fields required is with a server-side language such as PHP, ASP, ColdFusion... since a user cannot override these pages when properly coded.

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