At 07:45 2016-06-15, Ken Dibble <[email protected] wrote:
[snip]
Second Issue
The code in the InteractiveChange() and ProgrammaticChange() methods
of this textbox was originally identical.
In order to add an error handler that displays a message, resets the
values to empty dates, and does not crash the program, I added:
IF TYPE("THIS.Value") <> "D" OR TYPE("THIS.OldValue") <> "D"
*Issue some message
THIS.Value = {}
THIS.OldValue = {}
ENDIF
to the InteractiveChange() method before it gets to the property
value-comparison line.
Then I inserted
THIS.Value = "Foobar"
Above that block to test my change and ran the program.
I began typing into the textbox. I immediately got Error 107 from
the **ProgrammaticChange()** method.
Yes, I had only made the change in the InteractiveChange() method.
But I expected that method to generate the error message. Instead,
somehow, when I started typing, InteractiveChange() ran to the point
where I set the control's Value to a string, executed that line, and
then, instead of generating the error message, execution somehow jumped to the
^^^^^^^
The ProgrammaticChange event "[O]ccurs when the value of a
control is changed in code." You just changed the value of the
control, so the event fired.
ProgrammaticChange() method, where Error 107 occurred on:
IF THIS.Value <> THIS.OldValue
????
I don't believe that InteractiveChange() is supposed to call
ProgrammaticChange() or vice-versa. That's why there are two separate methods.
No, there are two separate *events*, because they fire for
different reasons. The docs for ProgrammaticChange Event start with
"Occurs when the value of a control is changed in code."
I have often said that the VFP order of events does not always
proceed as advertised, and I guess here is proof.
Not in this case.
Any thoughts?
Thanks and I hope you are amused.
Almost always.
Sincerely,
Gene Wirchenko
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