WebBrowser 操作记要

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:<head><title>标题</title><body>页面内容</body>');

//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;

假如网页中有这样的语句: <script> var str = "Hello"; i = 99; </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;

假如有这样的脚本: <script> function MB(){ alert('HTML-Js'); } </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.getElementById('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;

假如网页中有这样的内容: <span id=span1>这是 span1 标签中的内容</span>

//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;

模拟点击网页中的按钮

操作链接

支持高版本 ie:
<meta http-equiv="X-UA-Compatible" content="IE=edge" />

//待续...

posted on 2007-12-13 16:16 万一阅读(42545) 评论(117) 编辑收藏举报

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WebBrowser 操作记要