Lengkap Batasan

unit U_Batasan;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Button1: TButton;
    procedure FormShow(Sender: TObject);
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
    procedure Edit2KeyPress(Sender: TObject; var Key: Char);
    procedure Edit3KeyPress(Sender: TObject; var Key: Char);
    procedure Edit4KeyPress(Sender: TObject; var Key: Char);
    procedure Button1Click(Sender: TObject);
  private
    procedure EchhiDesu;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

{
  Programmer  : Jean Riko Kurniawan Putra, S.Kom
  Hobbi       : Nonton Anime, Ngesub Anime, Programmig, Phreaking
  FB          : Jean Riko Kurniawan Putra
  Blog        : http://djeansoftware.blogspot.com/
  Fanpage     : https://www.facebook.com/jean.software
}

procedure TForm1.EchhiDesu;
begin
  Edit1.Clear;
  Edit2.Clear;
  Edit3.Clear;
  Edit4.Clear;
end;

procedure TForm1.FormShow(Sender: TObject);
begin
  EchhiDesu;
  Edit1.SetFocus;
end;

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
    if not (key in['0'..'9',#8]) then key:= #0;
end;

procedure TForm1.Edit2KeyPress(Sender: TObject; var Key: Char);
begin
    if not (key in['A'..'Z','a'..'z',#8]) then key:= #0;
end;

procedure TForm1.Edit3KeyPress(Sender: TObject; var Key: Char);
begin
    if not (key in['0'..'9','A'..'Z','a'..'z',#8]) then key:= #0;
end;

procedure TForm1.Edit4KeyPress(Sender: TObject; var Key: Char);
begin
    if not (key in[#1..#8,#11..#27,#33..#47,#58..#64,#91..#96,#123..#127,#8]) then key:= #0;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  EchhiDesu;
  Edit1.SetFocus;
end;

end.