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Home/ Questions/Q 4110510
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Editorial Team
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Editorial Team
Asked: May 20, 20262026-05-20T21:56:37+00:00 2026-05-20T21:56:37+00:00

I’m trying to create an edit box and I want it to be able

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I’m trying to create an edit box and I want it to be able to auto-append the text entered while typing. Text would be appended with “suggestions” from a text file.

Let’s say I have these in my suggestion file:
Marilyn Monroe
Marlon Brando
Mike Myers

As I start typing “M” in the edit box, the remaining would appear highlighted(or not):
“arilyn Monroe”
And as I keep typing “Mi” then “ke Myers” would appear at the end. I hope I’m making this clear enough for you guys! Thanks for your help!

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  1. Editorial Team
    Editorial Team
    2026-05-20T21:56:37+00:00Added an answer on May 20, 2026 at 9:56 pm

    You can implement this feature easily using a TComboBox.

    follow these steps :

    • drop a combobox in your form
    • set the autocomplete property to true
    • set the sorted property to true
    • set the style property to csDropDown
    • in the OnExit event of the combobox add a code like this
    const
    MaxHistory=200;//max number of items
    
    
    procedure TForm1.ComboBoxSearchExit(Sender: TObject);
    begin
       //check if the text entered exist in the list, if not add to the list
       if (Trim(ComboBoxSearch.Text)<>'') and (ComboBoxSearch.Items.IndexOf(ComboBoxSearch.Text)=-1) then 
       begin
         if ComboBoxSearch.Items.Count=MaxHistory then
         ComboBoxSearch.Items.Delete(ComboBoxSearch.Items.Count-1);
         ComboBoxSearch.Items.Insert(0,ComboBoxSearch.Text);
       end;
    end;
    
    • Save the History of your combobox , for example in the OnClose event of your
      form
    procedure TForm1.FormClose(Sender: TObject);
    begin
       ComboBoxSearch.Items.SaveToFile(ExtractFilePath(ParamStr(0))+'History.txt');
    end;
    
    • in the Oncreate event of your form you can load the saved items
    procedure TForm1.FormCreate(Sender: TObject);
    var
     FileHistory  : string;
    begin
       FileHistory:=ExtractFilePath(ParamStr(0))+'History.txt';
       if FileExists(FileHIstory) then
       ComboBoxSearch.Items.LoadFromFile(FileHistory);
    end;
    
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