At 07:45 2016-06-15, Ken Dibble <krdibble@stny.rr.com 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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