Validating a Numeric Textfield

[Kush]

How can I validate that the text enterd by the user is numeric?

For example, I want to make sure that input_var.value is a number
if(input_var.value "is not a number&quot
{
alert('Enter numbers only.');
return false;
}

Thanks for any help.

 

[baad]

if (typeof(smth)!="number&quot {alert('allowed numbers only')} regards, vic

 

[dianal]

Another way:
if (isNaN(input_var.value)) {
alert('Enter numbers only.');
return false;
}
isNaN function returns true if the value is NaN(not a number), and false otherwise.

 

[ID10T16]

I've never used it before, so the function I wrote may not work as is, but isNaN is definitely the way to go in your case. Due to my lack of knowledge of the isNaN function, I would suggest trying to find someinfo on it. Might I suggest devguru.com ? That place has some swell quick refferences to stuff. Hope this at least helps point you in the right direction.

if(isNaN(input_var.value))
{
alert('Enter numbers only.');
return false;
}

 

[ID10T16]

Ooops, dianal beat me to it. Sorry bout that.