Validate characters in a field as being only letters
I have various uses for this: but for simple illustration -
I want to validate that a user is inserting only letters (a-z, either case) into say a First name field, as those characters are being entered. No punctuation, numbers, etc. should be allowed. I do not know how to use the OnObjectKeystroke script trigger in conjunction with the field to validate the characters being entered.
Thanks for the help in advance.