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AlishaMarie
05-05-2003, 04:08 PM
Is there a function that's the opposite of isNAN?? I have a value on a field that I need to verify. It's a name field so I don't want to allow any numbers.
Please help! ;-)
Charles
05-05-2003, 05:05 PM
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="Content-Script-Type" content="text/javascript">
<form action="">
<div>
<label>Name:<br>
<input type="text" onchange="if (!/^[a-z\s]+$/i.test(this.value)) {alert('That would not appear to be a valid name.'); this.value = ''; this.focus()}">
</label><br>
<input type="submit">
<div>
</form>
SniperX
05-06-2003, 12:26 AM
You could just use this...


if (isNAN(string) == false) {
return true;
}
else{
return false;
}

i.e.
If isNAN shows that there are letters, proceed, or if there are numbers then stop the user.
Charles
05-06-2003, 04:31 AM
Originally posted by SniperX
You could just use this...


if (isNAN(string) == false) {
return true;
}
else{
return false;
}

i.e.
If isNAN shows that there are letters, proceed, or if there are numbers then stop the user. Which is the same as return !Boolean(Number(string)) but neither will work the way AlishaMarie wants, returning true when numbers and letters are mixed.
SniperX
05-06-2003, 04:42 AM
She said she doesnt want numbers in the input...
Charles
05-06-2003, 04:47 AM
And your method will not catch "Charles 2".