delphi webbrowser 常用方法示例

Posted 2020-11-25 yjhb

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var   Form   :     IhtmlFormElement     ;
        D:IHTMLDocument2     ;
begin
    with   WebBrowser1   do   begin
          D   :=   Document   as   IHTMLDocument2;
          Form   :=   D.Forms.item( ‘form1 ‘,0)   as   IHTMLFormElement;   //form1为表单名
          //title为表单中的文本框
        (form.item( ‘title ‘,0)   as   IHTMLElement).setAttribute( ‘value ‘,s_title,0);  
        (form.item( ‘content ‘,0)   as   IHTMLElement).setAttribute( ‘value ‘,edit1.text,0);
        (form.item( ‘add ‘,0)   as   IHTMLElement).click;//add为按钮名称
    end;

在delphi的WebBrowser中获取和设置Input表单值

var
    i:Integer;
    myole:oleVariant;
begin
    myole := wb1.Document;
    for i := 0 to myole.all.length - 1 do
    begin
        if myole.all.item(i).tagName = ‘INPUT‘ then
        begin

            mmo1.Lines.Add(myole.all.item(i).name);

            mmo1.Lines.Add(myole.all.item(i).value);
        end;
    end;

end;

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;
--------------------------------------------------------------------------------
//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;

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