Limit Input Text to Uppercase Only?

1

I’ve got an input field that’s using a pixel font that’s pretty small. SOO…I’d like to limit the user’s input to only uppercase letters. I tried to just embed the uppercase letters, but that doesn’t seem to work - perhaps because I have the whole font on my system already? Even if that’s the case, and it will work on most people’s systems, how do I make sure that even if they type without the Shift Key or Caps Lock, that the letters are only uppercase? Is there a simple script for this somewhere?