delphi中EmbeddedWB网页html相互调用（二）

我们可以通过控件 EmbeddedWB_D5-D2010_Version_14.69.1 来响应html事件，还可以自定义html响应哪些html元素。

控件下载 点击下载

里面有demos文件夹大家可以看看delphi代码实例。

EmbeddedWB_D5-D2010_Version_14.69.1\Demos\EmbeddedWB Demos\15 - THTMLListener_Demo

关键方法：HtmlListener1HandlersOnClickHandle

这里贴出这个demo的代码

unit uMain;

interface

uses

  Windows, Messages, SysUtils, Classes, Controls, Forms,

  Dialogs, EwbBehaviorsComp, EwbEventsComp, EwbEvents, OleCtrls, SHDocVw_EWB, MSHTML_EWB, EwbCore,

  EmbeddedWB, StdCtrls, ComObj, ActiveX, ExtCtrls;

type

  TForm1 = class(TForm)

    EmbeddedWB1: TEmbeddedWB;

    Panel1: TPanel;

    btnEnableDisable: TButton;

    lblClickedOnElement: TLabel;

    lblElementUndertheMouse: TLabel;

    HtmlListener1: THtmlListener;

    procedure HtmlListener1HandlersOnClickHandle(Sender: TObject;

      Event: IHTMLEventObj);

    procedure FormCreate(Sender: TObject);

    procedure HtmlListener1HandlersOnMouseMoveHandle(Sender: TObject;

      Event: IHTMLEventObj);

    procedure EmbeddedWB1DocumentComplete(ASender: TObject;

      const pDisp: IDispatch; var URL: OleVariant);

    procedure btnEnableDisableClick(Sender: TObject);

    procedure FormDestroy(Sender: TObject);

    procedure EmbeddedWB1BeforeNavigate2(ASender: TObject;

      const pDisp: IDispatch; var URL, Flags, TargetFrameName, PostData,

      Headers: OleVariant; var Cancel: WordBool);

  private

    { Private declarations }

    HubLinksList: TInterfaceList;

    FEventsEnabled: Boolean;

    HubLink: IHubLink;

    procedure DisconnectHtmlListeners;

    procedure ConnectHtmlListeners;

    procedure ConnectHtmlListener(ASender: TObject; Doc: IHTMLDocument2);

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);

begin

  FEventsEnabled := True;

  HubLinksList := TInterfaceList.Create;

  EmbeddedWB1.Navigate('www.google.com');

end;

procedure TForm1.HtmlListener1HandlersOnClickHandle(Sender: TObject;

  Event: IHTMLEventObj);

begin

  lblClickedOnElement.Caption := Format('Clicked on Element with Tag: [%s]', [Event.srcElement.tagName])

end;

procedure TForm1.HtmlListener1HandlersOnMouseMoveHandle(Sender: TObject;

  Event: IHTMLEventObj);

begin

  lblElementUndertheMouse.Caption := Format('Element under the Mouse [%s]', [Event.srcElement.tagName])

end;

procedure TForm1.DisconnectHtmlListeners;

var

  i: Integer;

begin

  for i := HubLinksList.Count -  downto  do

  begin

    (HubLinksList[i] as IHubLink).Disconnect;

    HubLinksList.Remove(HubLinksList[i]);

  end;

end;

procedure TForm1.ConnectHtmlListener(ASender: TObject; Doc: IHTMLDocument2);

var

  CPC: IConnectionPointContainer;

begin

  if Assigned(Doc) then

  begin

    Doc.QueryInterface(IConnectionPointContainer, CPC);

    if Assigned(CPC) then

    begin

      HubLink := HtmlListener1.Connect2(CPC);

      HubLinksList.Add(HubLink);

    end;

  end;

end;

procedure TForm1.ConnectHtmlListeners;

var

  i: Integer;

  WB: IWebbrowser2;

  HTMLDoc: IHTMLDocument2;

begin

  for i :=  to EmbeddedWB1.FrameCount -  do

  begin

    WB := EmbeddedWB1.GetFrame(i);

    if Assigned(WB) then

    begin

      if Succeeded(WB.Document.QueryInterface(IHTMLDocument2, HTMLDoc)) then

        ConnectHtmlListener(nil, HTMLDoc);

    end;

  end;

end;

procedure TForm1.EmbeddedWB1BeforeNavigate2(ASender: TObject;

  const pDisp: IDispatch; var URL, Flags, TargetFrameName, PostData,

  Headers: OleVariant; var Cancel: WordBool);

begin

  with ASender as TEmbeddedWB do

    if pDisp = DefaultInterface then

    begin

      DisconnectHtmlListeners;

    end;

end;

procedure TForm1.EmbeddedWB1DocumentComplete(ASender: TObject;

  const pDisp: IDispatch; var URL: OleVariant);

var

  WB: IWebbrowser;

  HTMLDoc: IHTMLDocument2;

begin

  if FEventsEnabled then

  begin

    WB := (pDisp as IWebBrowser);

    if Assigned(WB) then

      if Succeeded(WB.Document.QueryInterface(IHTMLDocument2, HTMLDoc)) then

        ConnectHtmlListener(ASender, HTMLDoc);

  end;

end;

procedure TForm1.btnEnableDisableClick(Sender: TObject);

begin

  if FEventsEnabled then

  begin

    DisconnectHtmlListeners;

    btnEnableDisable.Caption := 'Enable Events';

    FEventsEnabled := False;

  end else

  begin

    ConnectHtmlListeners;

    btnEnableDisable.Caption := 'Disable Events';

    FEventsEnabled := True;

  end;

end;

procedure TForm1.FormDestroy(Sender: TObject);

begin

  DisconnectHtmlListeners;

  HubLinksList.Free;

end;

end.

完整代码下载：点击下载