only allow English characters and numbers for text input

Question

Live Demo: http://jsfiddle.net/thisizmonster/DveuB/

How can I change this so that the input only allows the characters A-Z, a-z, 0-9 while typing, without using a re

Answer 1

Think you have to write some if statements or something like that, that takes the keycode and validates it against some numbers that represent other keycodes:

for example: if(keycode < 80) return false;