How to change the input to uppercase as it is being typed

Question

I am using onkeyup=\"this.value=this.value.toUpperCase();\"to change input text value in uppercase. This is working but my need is to change a single letter in

Answer 1

You could check what key was pressed in the onkeyup and only process for keys a-z. Should be pretty easy since the keycodes are numeric and you could just check if the keycode is between the keycode for a (65) and z (90).