Question

我想暂停/禁用Windows.Form.WebBrowser Control浏览的任何网站的window.alert和window.onbeforeunload。我在主站点上调用它们时成功覆盖了这些函数，但如果在iframe上调用它们，我仍然无法覆盖此函数。

为了重现这个案例，我制作了2个HTML文件

测试HTML文件：主站点和远程站点

主要网站：

<html>
<head>
<script>
    window.onbeforeunload = confirmExit;
      function confirmExit()
      {
        return "Onbeforeunload from main";
      }
    alert("Alert from main")
</script>
</head>
<body>
    <a href="http://google.com">Google</a>
    <iframe src="remote.html">
</body>
</html>

远程网站：

<html>
<head>
<script>
    window.onbeforeunload = confirmExit;
      function confirmExit()
      {
        return "Onbeforeunload from remote";
      }
    alert("Alert from remote")
</script>
</head>
<body>
    <a href="http://google.com">Google</a>  
</body>
</html>

将这2个文件复制到同一个文件夹中（例如复制到桌面）

将主站点加载到webbrowser并覆盖window.alert / window.onbeforeunload

初始化：

webBrowser1.Navigate(@"file://127.0.0.1/C$/Users/ServusKevin/Desktop/main.html");
webBrowser1.Navigated += new WebBrowserNavigatedEventHandler(webBrowser1_Navigated);
webBrowser1.ProgressChanged += new WebBrowserProgressChangedEventHandler(webBrowser1_ProgressChanged);

代码：

private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e)
{
    ExecuteMe();
}

private void webBrowser1_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
{
    ExecuteMe();
}

private void ExecuteMe()
{
    DisableAlertIE(webBrowser1.Document as HtmlDocument);
    HtmlDocument document = (webBrowser1.Document as HtmlDocument);
    if (document != null)
    {
        for (int index = 0; index < document.Window.Frames.Count; index++)
        {
            try
            {
                DisableAlertIE((document.Window.Frames[index]).Document);
            }
            catch
            {
            }
        }
    }
}

private void DisableAlertIE(HtmlDocument document)
{
    if (document != null)
    {
        //HTMLDocument document = wbIE.Document as HTMLDocument;
        HtmlElement scriptSuppressed = document.CreateElement("script");
        IHTMLScriptElement scriptDomElement = (IHTMLScriptElement)scriptSuppressed.DomElement;
        scriptDomElement.type = "text/javascript";
        scriptDomElement.text = @"window.alert = function () { }; window.confirm = function () { }; window.prompt = function () { }; window.print = function () { }; window.onbeforeunload = function () {};";

        foreach (HtmlElement head in document.GetElementsByTagName("head"))
        {
            head.AppendChild(scriptSuppressed);
        }
    }
}

当我让程序运行时，主站点的window.alert和window.onbeforeunload已成功暂停，但仍会调用远程站点的alert和onbeforeunload。

问题：如何改进我的代码以暂停远程站点的警报和onbeforeunload？

.NET WebBrowser控件 - 覆盖IFrame的脚本？

0 个答案: