The InteractiveChange() method of this control (fires when the user
is typing in the control) will compare THIS.Value to THIS.OldValue
and if they are not the same, THIS.Value will be copied to
THIS.OldValue, like so:
IF THIS.Value <> THIS.OldValue
THIS.OldValue = THIS.Value
ENDIF
I don't get why you are checking using the interactivechange method.
This fires for every character you type in the control. If you want
to check a date I would use the Valid() or lostfocus() methods so
you can check the whole date not a half entered date. I only use
the interactivechange method when doing searches where you want to
display partial matches.
LostFocus() does not fire unless and until something else gets focus.
There are actions the user can take that result in nothing having
focus, so LostFocus() is not a reliable place to validate
user-entered contents of controls.
My memory is more dim regarding Valid(), but I believe I experimented
with it and could not get it to work the way I wanted. Perhaps I was
trying to display a MessageBox concerning the user's entry and it
would only display a WAIT WINDOW or something. I don't know, but that
decision was made long ago.
Although my decision may seem idiosyncratic, it has worked in
practice, and in theory there is no reason why my use of
InteractiveChange() should cause the error I've seen.
Thanks.
Ken Dibble
www.stic-cil.org
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