delphi TWebBrowser 使用

1.前进,后退,刷新

	self.WebBrowser1.GoBack
	self.WebBrowser1.GoForward
	self.WebBrowser1.Refresh

2.捕捉NewWindow2事件,即新开窗口事件

procedure TForm1.WebBrowser1NewWindow2(Sender: TObject; var ppDisp: IDispatch; var Cancel: WordBool); 
var
	NewWindow: TForm2;
begin 
	NewWindow:= TForm2.Create(nil); 

         NewWindow.Show;
	ppDisp:= NewWindow.Webbrowser1.DefaultDispatch;
end;

值得一题的是该方法不能获得新开窗口的URL,退一步的方法只能是等到在新的Webbrowser中触发BeforeNavigate2事件判断了


3.网页中存在iframe时判断页面是否下载结束

procedure TForm1.WebBrowser1DocumentComplete(Sender: TObject; const pDisp: IDispatch; var URL: OleVariant);
 begin

	if WebBrowser1.Application = pDisp then 
	showmessage('页面已全部下载完毕') 
end;

4. 执行网页中的函数

tmpf := 'currID = getNextID(currID)'+#13#10;

Form1.WebBrowser1.OleObject.Document.parentWindow.execScript(tmpf,'JavaScript');

一个不错的例子：

 WebBrowser1.GoHome; //到浏览器默认主页
 WebBrowser1.Refresh; //刷新
 WebBrowser1.GoBack; //后退
 WebBrowser1.GoForward; //前进
 WebBrowser1.Navigate('...'); //打开指定页面
 WebBrowser1.Navigate('about:blank'); //打开空页面

 //打开空页面, 并写入...
 WebBrowser1.Navigate('about:标题页面内容');

 //读取网页脚本中的变量:

 procedure TForm1.Button1Click(Sender: TObject);
 var
 s: string;
 i: Integer;
 begin
   s := WebBrowser1.OleObject.document.Script.str;
   i := WebBrowser1.OleObject.document.Script.num;
   ShowMessage(s); //Hello
   ShowMessage(IntToStr(i)); //99

   //也可以这样读:
   s := WebBrowser1.OleObject.document.parentWindow.str;
   i := WebBrowser1.OleObject.document.parentWindow.num;
   ShowMessage(s); //Hello
   ShowMessage(IntToStr(i)); //99
 end;
 <br>假如网页中有这样的语句:<br><script><br>var<br> str = "Hello";<br> i = 99;<br></script>

 //调用网页脚本中的函数:

 procedure TForm1.Button1Click(Sender: TObject);
 begin
   WebBrowser1.OleObject.document.parentWindow.MB(); //HTML-Js

   //如需指定脚本语言, 需要:
   WebBrowser1.OleObject.document.parentWindow.execScript('MB()','JavaScript'); //HTML-Js
 end;
 <br>假如有这样的脚本:<br><script><br>function MB(){ <br> alert('HTML-Js');<br>}<br></script&

 //判断网页及内部框架网页是否全部下载完毕

 procedure TForm1.WebBrowser1DocumentComplete(ASender: TObject;
   const pDisp: IDispatch; var URL: OleVariant);
 begin
   if WebBrowser1.Application = pDisp then
   begin
     Text := '网页下载完毕！';
   end;
 end;

 //改变背景色或背景图片:
 WebBrowser1.OleObject.document.body.bgcolor := '#FF0000';
 WebBrowser1.OleObject.document.body.background := '...图片地址';

 //操作有 ID 标签的对象:
 var
   s: string;
 begin
   s := WebBrowser1.OleObject.document.getElementByIdx_x('span1').innerText;
   ShowMessage(s); //这是 span1 标签中的内容

   //或者:
   s := WebBrowser1.OleObject.document.parentWindow.span1.innerText;
   ShowMessage(s); //这是 span1 标签中的内容

   //隐藏它:
   WebBrowser1.OleObject.document.parentWindow.span1.style.display := 'none';
 end;
 <br>假如网页中有这样的内容:<br><span id=span1>这是 span1 标签中的内容</span><br>

 //获取网页源代码
 var
   s: string;
 begin
   s := WebBrowser1.OleObject.document.body.innerHTML; //body内的所有代码
   s := WebBrowser1.OleObject.document.body.outerHTML; //body内的所有代码, 包含body标签
   s := WebBrowser1.OleObject.document.documentElement.innerHTML; //html内的所有代码
 end;

 //获取网页全部源代码
 uses ActiveX;
 var
   ms: TMemoryStream;
 begin
   if not Assigned(WebBrowser1.Document) then Exit;
   ms := TMemoryStream.Create;
   (WebBrowser1.Document as IPersistStreamInit).Save(TStreamAdapter.Create(ms), True);
   ms.Position := 0;
   Memo1.Lines.LoadFromStream(ms, TEncoding.UTF8);
   // Memo1.Lines.LoadFromStream(ms, TEncoding.Default); {GB2312 等双字节}
   ms.Free;
 end;

 //WebBrowser 中的右键菜单

 //先要添加ApplicationEvents1,指定其Message事件

 //屏蔽右键菜单
 procedure TForm1.ApplicationEvents1Message(var Msg: tagMSG; var Handled: Boolean);
 begin
   with Msg do
   begin
     if not IsChild(WebBrowser1.Handle, hWnd) then Exit;
       Handled := (message = WM_RBUTTONDOWN) or (message = WM_RBUTTONUP) or (message = WM_CONTEXTMENU);
   end;
 end;

 //替换右键菜单
 procedure TForm1.ApplicationEvents1Message(var Msg: tagMSG; var Handled: Boolean);
 var mPoint: TPoint;
 begin
   if IsChild(WebBrowser1.Handle, Msg.Hwnd) and
   ((Msg.Message = WM_RBUTTONDOWN) or (Msg.Message = WM_RBUTTONUP)) then
   begin
     GetCursorPos(mPoint); //得到光标位置
     PopupMenu1.Popup(mPoint.X, mPoint.Y); //弹出popupmenu1的菜单
     Handled:=True;
   end;
 end;

 //新页面写入
 begin
   WebBrowser1.Navigate('about:blank');
   WebBrowser1.OleObject.Document.Writeln('ok');
 end;

 //从流中写入:
 var
 ms: TMemoryStream;
 begin
   ms := TMemoryStream.Create;
   Memo1.Lines.SaveToStream(ms);
   ms.Position := 0;
   (WebBrowser1.Document as IPersistStreamInit).Load(TStreamAdapter.Create(ms));
   ms.Free;
 end;

 //禁止提示脚步错误
 procedure TForm1.WebBrowser1NavigateComplete2(ASender: TObject;
 const pDisp: IDispatch; var URL: OleVariant);
 begin
   WebBrowser1.Silent := True;
 end;

 //禁止弹出窗口
 procedure TForm1.WebBrowser1NewWindow2(ASender: TObject; var ppDisp: IDispatch;
 var Cancel: WordBool);
 begin
   Cancel := True;
 end;