validate fields for numeric values only

Hello guys,

How can I validate that users have entered text or anything else for that matter and give them a pop up message informing they can only enter numbers.

I am new to this as you can see by my question,I hope somebody can help.

Regards

Here is an example:-

<tr>
<td><font face="Arial"><em><b>Club Membership No. (if applicable)</b></em></font></td>
<td><input type="text" size="8" maxlength="8" name="MemNumber" onblur="if(/\D/g.test(this.value)){alert('Only current Club membership numbers are valid in this box. ');this.value='';this.focus()}; </font></td></tr>

Here's a script that works the same as Philip's.

var f = document.forms[0]

var v = f.NumField.value
for (i=0; i<v.length; i++)
{
if ((v.charCodeAt(i)<48 || v.charCodeAt(i)>57) && v.charCodeAt(i) !== 44 )
{
alert ( "This must be numeric." )
f.NumField.value = "";
f.NumField.focus()
return false
}
}

if(parseFloat(Field.value,10)==Field.value){}
or
if(parseInt(Field.value,10)==Field.value){}

parseFloat doesn't need that second argument of 10 since it may only take decimal numbers, but the parseInt needs it.

parseFloat() has no radix parameter unlike parseInt(). It always parse numbers in base 10

parseFloat() has no radix parameter unlike parseInt(). It always parse numbers in base 10
Beat you to it :);):)

:D :)