Count characters as you type in a field
I want to be able to count the number of characters in a field as you type so that I can write student reports without going over the 320 chracter limit that the school has set. A bit like when you type a text message and it tells you the number of characters you have used.
I know how to display a calculation in a field that shows the number of characters using the 'Length' code but that only shows when you exit the field.
Any help much appreciated. It's not a big one as I can live with just displaying the count but live updating would be nice.