In the same way that for textfield called 'message'
as soon as 50chars limit is reached you can no longer type in
the textfield, I want to be able to prevent certain characters from
being typable in the textfield for eg a full stop '.'
I know I could replace these unwanted chars once the
textfield is submitted, however is there a way to do it at runtime,
in that the user simply wont be able to input these chars that
would be preferable. Thanks in advance Jonny.