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List Box failure

Posted on 2000-05-10
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Last Modified: 2010-04-04
I am creating a form with various DB compnents. All grids, combo boxes seem to work except a list box I am tring to generate. I can insert assign it data and fields but it simply will not display the data. What is going on?
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Question by:jblangworthy
6 Comments
 

Expert Comment

by:skyrider_tieus
ID: 2798297
Can you be more specific?
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Expert Comment

by:NetoMan
ID: 2798360
listening...
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Expert Comment

by:simonet
ID: 2798518
Are you sure it's a TDBListBox (the data-aware version) ?

Are you linking it correctly to the datasource and setting the field name accordingly?

If the datasource's dataset active (is table or query open) ?

Alex
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Expert Comment

by:ITugay
ID: 2799340
listening...
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Author Comment

by:jblangworthy
ID: 2802585
Yes, it is a DBListBox. I have sorted the problem now anyway, thanks. I didn't realise I had to add the items to the list-box. I thought it would fill them in itself, like access does.
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Accepted Solution

by:
simonet earned 200 total points
ID: 2925917
>I thought it would fill them in itself, like access does.

You can do that automatically in runtime, based on the existing different items in the table.

Suppose the TDBListBox is linked to the field DESCRIPTION of TABLE1, and you want all existing "descriptions" to be displayed at the dblistbox.

This will do it for you:
(you'll need a TQuery [Query1] component)

procedure FillDBListBox;
begin
  with Query1, DBListBox1 do
  begin  
    items.beginupdate;
    items.clear;
    close;
    sql.text := 'SELECT DISTINCT DESCRIPTION FROM TABLE1 ORDER BY DESCRIPTION';
    open;
    first;
    while not eof do
    begin
       items.add(fieldbyname('description').asstring;
       next;
    end;
    items.endupdate;
  end;
end;

Yours,

Alex
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