delphi TWebBrowser 使用

来源：互联网发布：绿盾软件编辑：程序博客网时间：2024/05/16 20:27

1.前进,后退,刷新

self.WebBrowser1.GoBackself.WebBrowser1.GoForwardself.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); varNewWindow: 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); beginif 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:<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;
&lt;br&gt;假如网页中有这样的语句:&lt;br&gt;&amp;amp;lt;script&amp;amp;gt;&lt;br&gt;var&lt;br&gt; str = &quot;Hello&quot;;&lt;br&gt; i = 99;&lt;br&gt;&amp;amp;lt;/script&amp;amp;gt;
//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;
&lt;br&gt;假如有这样的脚本:&lt;br&gt;&amp;amp;lt;script&amp;amp;gt;&lt;br&gt;function MB(){ &lt;br&gt; alert('HTML-Js');&lt;br&gt;}&lt;br&gt;&amp;amp;lt;/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;
&lt;br&gt;假如网页中有这样的内容:&lt;br&gt;&amp;amp;lt;span id=span1&amp;amp;gt;这是 span1 标签中的内容&amp;amp;lt;/span&amp;amp;gt;&lt;br&gt;
//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;

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