Is there a way to "autoreturn" when a required number of characters is entered in a form? I am asking the user to enter a customer's telephone number, and I do not want to force the user to hit the TAB key or click on the next form to continue...

So, the first form requires 3 numbers (area code).

The second form requires 3 numbers (prefix).

The third form requires 4 numbers (sufix).