Stringgrid validate How ?
lazarus / 16-Databases

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k1attila1 · 2014-11-28 11:25

Hi

Stringgrid :

How can i validate the content of a cell and how can i prevent to move
to the next cell
if the result of validate is FALSE.

thanks

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Blaazen · 2014-11-28 11:43

You can use event OnValidateEntry. If NewValue is not valid, you can
change it to OldValue or to some valid default value. Although I don't
know how to prevent the move (other than setting AutoAdvance to
aaNone).

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k1attila1 · 2014-11-28 12:12

So, Abort; method in OnValidateEntry prevent to leave the actual cell.

But using Abort; procedure in Lazarus very chaotic.

for example :

Field.OnValidate - Abort doesn't prevent to leave the actual dbcontrol
Edit.onExit - ABORT doesn't prevent to move the cursor to the next
field

etc....

Sometimes works , sometimes not....

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Blaazen · 2014-11-28 17:29

IMO Abort; is not intended to be used in GUI apps.at all.

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taazz · 2014-11-29 00:26

Quote from: Blaazen on November 28, 2014, 06:29:21 pmIMO Abort; is not
intended to be used in GUI apps.at all.

Abort is the only silent exception that the library supports it is
supposed to be used everywhere. The problem is that when an event is
raised does it give the ability to the end user to stop the action in
its tracks? If not why not?

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k1attila1 · 2014-11-29 09:12

for example work well Abort :

- DataSet : -beforedelete
                -beforeinsert
                - beforepost
                  etc.
But not work absoultely in visual components (which have text input
tedit, tmemo, tdbedit etc. ) - onexit method

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mangakissa · 2014-12-01 08:09

use stringgrid as readable records. For editing use Other GUI controls
which are not related to multiple records.