Problem:
Web forms that have multiline text boxes and/or Submit buttons do not
respond to the Enter key when displayed on a TWebbrowser.
Also when browsing local folders, some keys don't respond.
How to solve it:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, OleCtrls, SHDocVw, ActiveX;
type
TForm1 = class(TForm)
WebBrowser1: TWebBrowser;
Button1: TButton;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
FOleInPlaceActiveObject: IOleInPlaceActiveObject;
procedure MsgHandler(var Msg: TMsg; var Handled: Boolean);
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormDestroy(Sender: TObject);
begin
FOleInPlaceActiveObject := nil;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
Application.OnMessage := MsgHandler;
end;
procedure TForm1.MsgHandler(var Msg: TMsg; var Handled: Boolean);
const
StdKeys = [VK_BACK, VK_UP, VK_DOWN, VK_LEFT, VK_RIGHT];
var IOIPAO: IOleInPlaceActiveObject;
Dispatch: IDispatch;
begin
if WebBrowser1 = nil then
begin
Handled := False;
Exit;
end;
Handled := (IsDialogMessage(WebBrowser1.Handle, Msg) = True);
if (Handled) and (not WebBrowser1.Busy) then
begin
if FOleInPlaceActiveObject = nil then
begin
Dispatch := WebBrowser1.Application;
if Dispatch <> nil then
begin
Dispatch.QueryInterface(IOleInPlaceActiveObject, IOIPAO);
if IOIPAO <> nil then FOleInPlaceActiveObject := IOIPAO;
end;
end;
if FOleInPlaceActiveObject <> nil then
if ((Msg.message = WM_KEYDOWN) or (Msg.message = WM_KEYUP)) and
(Msg.wParam in StdKeys) then
//nothing - do not pass on Backspace, Left, Right, Up, Down arrows
else FOleInPlaceActiveObject.TranslateAccelerator(Msg);
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
Webbrowser1.Navigate('www.SwissDelphiCenter.ch');
end;
initialization
OleInitialize(nil);
finalization
OleUninitialize
end.