Allow Interger inputs only on an input box

[jkkenzie]

Hi!

I would like to ensure that only integers 0 - 100 are keyed in.

I have not tried it before, any idea?

[RichardRotterdam]

I think this wheel probably has been invented like a million times. search and you shall find a script that already does this

http://www.cambiaresearch.com/c4/029c978b-aac5-472e-97a8-95b256f5febd/How-Can-I-Use-Javascript-to-Allow-Only-Numbers-to-Be-Entered-in-a-TextBox.aspx

[jkkenzie]

Thanks:

 

[KevinM1]

Why use character codes when you can use regex?  Comments are for the OP.

 

function validateNumber(){
   var num = document.getElementById('input').value; // <-- 'input' is a generic name...use the actual form input id
   var regex = /^[0-9]{3}$/; // <-- this says "3 characters that are in the class 0 thru 9"

   if(!num.match(regex)){ // <-- if the number DOES NOT match the pattern, give an error
      alert(num + " isn't a 3 digit number!");
      return false;
   }
   else{
      return true;
   }
}