CODEWITHSUNDEEP
c#winformswebbrowser-control
ploink
ploink

Reputation: 61

Supress the "are you sure you want to leave this page" popup in the .NET webbrowser control

I have a web browser automation project written in WinForms C#. During the navigation there is a point where the browser does the "are you sure you want to leave this page?" popup. We need this popup, so I cannot remove it from the website code, which means I have to override it in my automation app.

Does anyone have an idea how to do this?

Upvotes: 0

Views: 3398

Answers (3)

MinhHD
MinhHD

Reputation: 1

Don't need add anymore. Try it. Work like a charm. ^_^

private void webNavigated(object sender, WebBrowserNavigatedEventArgs e)
    {
        HtmlDocument doc = webBrowser.Document;
        HtmlElement head = doc.GetElementsByTagName("head")[0];
        HtmlElement s = doc.CreateElement("script");
        s.SetAttribute("text", "function cancelOut() { window.onbeforeunload = null; window.alert = function () { }; window.confirm=function () { }}");
        head.AppendChild(s);
        webBrowser.Document.InvokeScript("cancelOut");
    }

Upvotes: 0

ploink
ploink

Reputation: 61

and here was the smooth solution..

add a reference to mshtml and add using mshtml;

Browser.Navigated += 
    new WebBrowserNavigatedEventHandler( 
        (object sender, WebBrowserNavigatedEventArgs args) => { 
            Action<HtmlDocument> blockAlerts = (HtmlDocument d) => { 
                HtmlElement h = d.GetElementsByTagName("head")[0]; 
                HtmlElement s = d.CreateElement("script"); 
                IHTMLScriptElement e = (IHTMLScriptElement)s.DomElement; 
                e.text = "window.alert=function(){};"; 
                h.AppendChild(s); 
            }; 
            WebBrowser b = sender as WebBrowser; 
            blockAlerts(b.Document); 
            for (int i = 0; i < b.Document.Window.Frames.Count; i++) 
                try { blockAlerts(b.Document.Window.Frames[i].Document); } 
                catch (Exception) { }; 
        } 
    );

Upvotes: 2

Damien_The_Unbeliever
Damien_The_Unbeliever

Reputation: 239704

Are you able to make any changes to the website code?

If so, you might look at exposing an object through ObjectForScripting, then having the website code check window.external (and possibly interrogating your object) before it decides to display the popup - so if it can't find your object, it assumes it's being used normally and shows it.

Upvotes: 0

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