BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TDBGridColumns Problem          BorlandTalk.com Forum Index -> Delphi Databases (Desktop) View previous topic :: View next topic   Author Message Martyn Davies Guest Posted: Fri Apr 16, 2004 2:23 am    Post subject: TDBGridColumns Problem Hi Does anyone know of a way of finding out if a field is currently being displayed in a TDBGrid without iterating through the columns? Is there some way TDBGridColumns as a collection can be used for his purpose, perhaps - something like FindItemId, maybe? Using D5pro, XP, MSAccess97 Any help greatly appreciated. Regards Martyn Davies Back to top Bill Todd (TeamB) Guest Posted: Fri Apr 16, 2004 3:46 am    Post subject: Re: TDBGridColumns Problem A quick check of the methods of TDBGridColumns in the on-line help shows no such method. :) -- Bill (TeamB) (TeamB cannot respond to questions received via email) Back to top Martyn Davies Guest Posted: Fri Apr 16, 2004 4:45 am    Post subject: Re: TDBGridColumns Problem Quote: A quick check of the methods of TDBGridColumns in the on-line help shows no such method. Hi Bill Thanks for your response. According to the help on TCollection, FindItemId is one of its methods. If TDBGridColumns is descended from TCollection, shouldn't I be able to reference TColumn items as TCollection items and find out if the field I'm looking for is in the collection? Something along the lines of: .... var i: Integer; TCollection(dgProduct.Columns).FindItemId(MyColumnIndex) .... Trouble is, I know the FieldName but not its ColumnIndex. Regards Martyn Davies Back to top Mike Shkolnik Guest Posted: Fri Apr 16, 2004 8:33 am    Post subject: Re: TDBGridColumns Problem The TDBGrid have the SelectedField property where you may get the current selected field -- With best regards, Mike Shkolnik EMail: [email]mshkolnik (AT) scalabium (DOT) com[/email] http://www.scalabium.com "Martyn Davies" <martyncd (AT) ctrlx (DOT) hotmail.com> wrote Quote: Hi Does anyone know of a way of finding out if a field is currently being displayed in a TDBGrid without iterating through the columns? Is there some way TDBGridColumns as a collection can be used for his purpose, perhaps - something like FindItemId, maybe? Using D5pro, XP, MSAccess97 Any help greatly appreciated. Regards Martyn Davies Back to top Martyn Davies Guest Posted: Fri Apr 16, 2004 1:21 pm    Post subject: Re: TDBGridColumns Problem "Mike Shkolnik" <mshkolnik2002 (AT) ukr (DOT) net> wrote: Quote: The TDBGrid have the SelectedField property where you may get the current selected field Thanks for your input, Mike However, let me clarify... I have a grid which may show any number and any combination of fields from a dataset of 43 fields. I need to find out if any one of the 43 fields is currently being displayed in the grid. Regards Martyn Davies Back to top Bill Todd (TeamB) Guest Posted: Fri Apr 16, 2004 1:29 pm    Post subject: Re: TDBGridColumns Problem On 15 Apr 2004 21:45:08 -0700, "Martyn Davies" <martyncd (AT) ctrlx (DOT) hotmail.com> wrote: Quote: Trouble is, I know the FieldName but not its ColumnIndex. Exactly. That was obvious from your original message and there is no way to search the collection by field name. You will have to write your own method to loop through the columns collection to find the name you want. -- Bill (TeamB) (TeamB cannot respond to questions received via email) Back to top Quasidata Guest Posted: Sun Apr 18, 2004 6:01 am    Post subject: Re: TDBGridColumns Problem Hello Martyn, Here is a sample. procedure TForm1.Button1Click(Sender: TObject); const MyFieldName = ''; var MyColumn: TColumn; begin MyColumn := MyFindColumn(MyFieldName); if Assigned(MyColumn) then Caption := IntToStr(MyColumn.Index); end; function TForm1.MyFindColumn(const AFieldName: string): TColumn; var MyColumns: TDBGridColumns; I: Integer; begin MyColumns := DBGrid1.Columns; for I := 0 to MyColumns.Count - 1 do begin Result := TColumn(MyColumns[I]); if AnsiCompareText(Result.FieldName, AFieldName) = 0 then Exit; end; Result := nil; end; -- Andrei Fomine www.quasidata.com DbAltGrid - multi-line layout, RTF and graphics of any kind in DBGrid. Transfer@Once - full-blown clipboard and drag-and-drop data transfer to/from any control in many formats, including ones native to MS Office. "Martyn Davies" <martyncd (AT) ctrlx (DOT) hotmail.com> wrote Quote: Hi Does anyone know of a way of finding out if a field is currently being displayed in a TDBGrid without iterating through the columns? Is there some way TDBGridColumns as a collection can be used for his purpose, perhaps - something like FindItemId, maybe? Using D5pro, XP, MSAccess97 Any help greatly appreciated. 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