Delphi/Lazarus: Enter-Key in Edit-Field

You can just respond to the return key in the OnKeyPress event of the edit field. Enter has the key code #13, so the condition could look something like that:

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
  if Key = #13 then begin
    Button1.Click; // or something else
    Key := #0;
  end;
end; 

Here, we are just calling the procedure Button1Click, so that the code from this procedure will be executed when pressing the enter key within the edit. Of course, you can also use any other code at this point.

It is important to subsequently set the key to #0 in order to ensure that there will be no further processing in the edit.
2015-03-18 at 22:32

If you want to press a button when the enter key is hit, you can also set the property "Default" of the button to "true". With this, the button will be clicked automatically when Enter is pressed.

The same applies for the ESC key. In this case, you have to set the property "Cancel" to "true".
2015-03-20 at 23:06