Solved

Still Having a problem with look up

Posted on 1997-04-16
1
469 Views
Last Modified: 2012-06-27
I have three files. The first is called IngredientCategories.  It contains to fields.  
1. ING_CAT 40 C
2. ING_SUB 40 C

My Second file is called IngredientInformation it contains
1. ING_CAT 40 C (To Enable a master detail form)
2. ING_NAME 30 C
3. ING_MSRE 2 C

My Third is called IngredientMeasures it contains
1. ING_MSRE 2 C

I wish to read from this and do a lookup on a grid.  I wish to use The ING_MSRE from the second file to read from the third.  How is this done?  It just won't work for me.
Thanks.
0
Comment
Question by:Andrew Harrison
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 

Accepted Solution

by:
nicsom earned 20 total points
ID: 1335419
For this kind of functionality I always use the Info Power Tools by Woll2Woll software.
You kan find a free trial version on HTTP://SUNSITE.ICM.EDU.PL/DELPHI/

It is completely native Delphi and has improved or new components for :
- Datasource
- Table
- DBGrid
- SQL-Query
- QBE-Query (paradox-based)
- KeyCombo
- Incremental search
- Search Dialog
- Locate Dialog
- Memo Dialog
- DbComboBox
- DbComboDlg
- DbLookupCombo
- DbLookupComboDlg
- DbLookupDlg (This is the one you'll need)

But if you've seen these components, you won't use the native Delphi TDataSource
and TTable-components...

Finally an example of how you should use the wwDbLookUpDlg-component.

The DoubleClick-method of your DBGrid containing the IngredientInformation:

procedure TfrmIngredient.grdIngredientDblClick(Sender: TObject);
begin
     {Determine whether you've double clicked on the ING_MSRE field}
     if grdIngredient.SelectedField = tblIngredientInfoIngMsre then
     begin
        {This is the TwwLookupDialog-component from the Info Power Tools}
        with luIngMsre do
        begin
           {Reset the index of the lookuptable to the primary key}
           LookupTable.indexname:= '';
           {Move to the record containing the measure}
           {that is currently in the ING_MSRE field in the DbGrid}
           LookupTable.wwFindKey([tblIngredientInfoIngMsre.asString]);
           {Execute the TwwLookupDialog, it returns TRUE if you selected a value}
           if execute then
           begin
              {Bring the IngredientInfo table in EDIT mode}
              tblIngredientInfo.Edit;
              {Assign the returned value to the ING_MSRE-field}
              tblIngredientInfoIngMsre.asString := LookupTable.fieldByName('Ing_Msre').asString;
           end;
           {Make sure that the cursor stays on the ING_MSRE-field;
           grdIngredient.SelectedField := tblIngredientInfoIngMsre;
        end;
     end;
end;
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

763 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question