<html>
<head>
<title></title>
<script type="text/javascript">
function ChkKeyPressed(e, str) {
var keyNum;
// IE
if (window.event) { keyNum = e.keyCode; }
//
Netscape/Firefox/Opera/Chrome
else if (e.which) { keyNum = e.which; }
// Chk
whether dot is available
var isDot = str.value.indexOf(".");
// Chk
for second dot
if (isDot > -1 && keyNum == 46) { return false; }
//
Allow first dot
else if (keyNum == 46) { return true; }
//
Allow numeric char 0 to 9
else if (keyNum <= 57 && keyNum >= 48) { return true; }
//
Block all other characters
else { return false; }
}
</script>
</head>
<body>
Enter your number:
<input type="text" onkeypress="return ChkKeyPressed(event, this)" />
</body>
</html>
No comments:
Post a Comment