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To test whether treenode exists

Posted on 2003-10-22
10
Medium Priority
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Last Modified: 2010-04-03
Hi

how do i check if a treenode with text 'uncle' in a treeview already exists?
anyone know?
cos i dont wanna add a treenode with text 'uncle' when one already exists.
0
Comment
Question by:Alpha_AI
  • 4
  • 4
8 Comments
 
LVL 27

Accepted Solution

by:
kretzschmar earned 500 total points
ID: 9597307
a sample

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls;

type
  TForm1 = class(TForm)
    TreeView1: TTreeView;
    Button1: TButton;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function FindNodeByText(ATree : TTreeView; AText : String) : TTreeNode;
var I : integer;
begin
  result := nil;
  i := 0;
  while (i < ATree.Items.Count) and
        (ATree.Items[i].Text <> AText) do inc(i);
  if i < ATree.Items.Count then
    result := ATree.Items[i];
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if assigned(FindNodeByText(TreeView1,Edit1.text)) then
    showmessage('Node Exist')
  else
    showmessage('No Node Exist');
end;

end.

meikl ;-)
0
 

Author Comment

by:Alpha_AI
ID: 9597341
Hi Kretzhmar,

you added a comment but its not here somehow.
maybe you need to add it again.
0
 

Author Comment

by:Alpha_AI
ID: 9597344
now ive found it im sorry it didn't show up before
0
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Author Comment

by:Alpha_AI
ID: 9597667
hi can i ask you how to do the same for valuelisteditors
how do i test that if a word does not exist in the key area, add the word to the list.
please and i will give you some more points on top.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 9597738
a simple sample

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Grids, ValEdit;

type
  TForm1 = class(TForm)
    ValueListEditor1: TValueListEditor;
    Edit1: TEdit;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function IsKeyInList(AList : TStrings; AKey : String) : Boolean;
begin
  result := AList.IndexOfName(AKey) > -1;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if IsKeyInList(ValueListEditor1.Strings,edit1.Text) then
    Showmessage('Key Exists')
  else
    Showmessage('Key not Exists');
end;

end.

meikl ;-)
0
 

Author Comment

by:Alpha_AI
ID: 9597744
Hay dude ive already figured it out for the valuelisteditor
it was

 for i := 0 to ValueListEditor14.Strings.Count-1 do
      begin
      value := ValueListEditor14.FindRow(noun,i);
      end;

    if value = false then
      begin
      ValueListEditor14.Values[noun] := '100';
      end;

but umm i saw a email posted just before i figured it out so i guess i owe you the extra points?

0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 9597766
>i guess i owe you the extra points?
doesn't matter, its your decission ;-)
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 9604881
don't forget the grade
0

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