Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
  Problem: 

  Web forms that have multi-line 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, OleCtrls, SHDocVw_TLB, ActiveX, StdCtrls;

 type
   TForm1 = class(TForm)
     WebBrowser1: TWebBrowser;
     Button1: TButton;
     Button2: TButton;
     procedure FormDestroy(Sender: TObject);
     procedure FormCreate(Sender: TObject);
     procedure Button1Click(Sender: TObject);
     procedure Button2Click(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
   DialogKeys: set of Byte = [VK_LEFT, VK_RIGHT, VK_BACK, VK_UP, VK_DOWN,
     $30..$39, $41..42, $44..$55, $57, $59..$5A];
 var
   iOIPAO: IOleInPlaceActiveObject;
   Dispatch: IDispatch;
 begin
   { exit if we don't get back a webbrowser object }
   if (WebBrowser1 = nil) then
   begin
     Handled := System.False;
     Exit;
   end;

   Handled := (IsDialogMessage(WebBrowser1.Handle, Msg) = System.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 DialogKeys) then
         // nothing - do not pass on the DialogKeys 
      else
         FOleInPlaceActiveObject.TranslateAccelerator(Msg);
   end;
 end;

 initialization
   OleInitialize(nil);

 finalization
   OleUninitialize;