[thelist] Validating Form for Numeric Data
Chris Marsh
chris at webbtech.co.uk
Tue Nov 12 13:40:33 CST 2002
> After a long night last night, I'm a bit lazy today so I was
> hoping for a simple code snippet.
>
> My form has a text input field called "ImpoundNo". What's the
> javascript to ensure that the data entered in that field is
> only numeric (no decimals)?
Something like this may do the trick...
<html>
<head>
<title>
Test
</title>
<script>
function CheckNum(x) {
if(isNaN(x)) {
alert("This must be a number");
}
}
</script>
</head>
<body>
<input type='text' onkeyup='CheckNum(this.value);this.focus();return
false;' />
</body>
</html>
HTH
Regards
Chris Marsh
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