Setting the OnClick procedure of a Delphi button at runtime

Question

I have a program in which I need to update a database table with information entered into edit boxes, with a button at the end to do the updating. However, the form is creat

Answer 1

Event handlers must be declared exactly how the event type is defined. An OnClick event is declared as a TNotifyEvent which takes parameters (Sender: TObject). You cannot break that rule.

In your case, you can wrap your own procedure inside of the event handler, like so...

procedure TForm1.Button1Click(Sender: TObject);
begin
  UpdateDatabase(Edit1.text,Edit2.Text,Edit3.Text);
end;

Note that TNotifyEvent is a procedure "of object", which means your event handler must be declared inside of an object. In your case, the event handler should be declared inside your form (not in a global location).