Limiting data entry in fields

[Andrew Kluthe]

Inside of the field script put something like this:

on keyDown pKey

put the number of chars of me into sCount

if sCount < 3 then

if pKey is not in "1234567890" then

pass keyDown

end if

end if
end keyDown

This should make it so that everytime a key is pressed in that field it
counts how many characters it has, if it is less than 3 it checks to see if
it is a number or in the allowed list, if so it passes that key.

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