Combined DBEdit / DBLookupCombo

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2 total messages Started by Marc Scheuner Mon, 18 May 1998 00:00

#124

Author: Marc Scheuner
Date: Mon, 18 May 1998 00:00

22 lines
1723 bytes

I have the following setup: I have a TDBEdit control to enter a code
value, and a TDBLookupCombo that will display the clear text of the
codes and select the code (a numerical value) into the same field as
referenced by the TDBEdit object.

When I enter a value in the TDBEdit and leave the field, the
TDBLookupCombo gets updated, as expected, and vice-versa.

But how can I get the DBLookupCombo to update *WHILE* I am typing in
codes in the TDBEdit? I tried to find a method to "synchronize" these
two controls, but even studying the VCL source code didn't reveal any
"legal" (i.e. "public") way to do so. Any hints?

Marc

------------------------------------------------------------------------
Marc Scheuner                                    marc.scheuner@berner.ch
Berner Versicherungen / ISV                       Tel ++41 31 / 384 5630
Sulgeneckstrasse 19                               Fax ++41 31 / 384 5490
CH-3001 Bern, Switzerland 
------------------------------------------------------------------------

Re: Combined DBEdit / DBLookupCombo

#123

Author: Christian R. Conrad
Date: Thu, 21 May 1998 00:00

33 lines
2044 bytes

On Mon, 18 May 1998 14:00:40 GMT, marc.scheuner@no.spam.please.ch
(Marc Scheuner) wrote:

> I have the following setup: I have a TDBEdit control to enter a code
> value, and a TDBLookupCombo that will display the clear text of the
> codes and select the code (a numerical value) into the same field as
> referenced by the TDBEdit object.

> When I enter a value in the TDBEdit and leave the field, the
> TDBLookupCombo gets updated, as expected, and vice-versa.

> But how can I get the DBLookupCombo to update *WHILE* I am typing in
> codes in the TDBEdit? I tried to find a method to "synchronize" these
> two controls, but even studying the VCL source code didn't reveal any
> "legal" (i.e. "public") way to do so. Any hints?

I dunno...

Perhaps a Locate on the Lookup data set in the OnChange event of the
DBEdit. Unless that leads to an endless loop? But it shouldn't, should
it, for the first call to Locate should find the correct value (if one
exists), and then the second should only find the same --> no change.

I think, but no guarantees... Try it out for yourself, and good luck!

        Christian R. Conrad
-- 
Proud and sole owner of all opinions (except quotes) expressed above!
======================================================================
     "Wave goodbye to RISC. It's the rotary engine of computing."
            Brad Aisa, in comp.lang.pascal.delphi.advocacy

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