Can I avoid the "Are you sure you want to navigate away from this page?" popup?

[Jim Bourekas]

Hello,

When I have an open website form within CefSharp and navigate away, I get the familiar "Are you sure you want to navigate away from this page?" message. 

Is there a way to avoid this message? It currently blocks my automations until the user clicks on the popup.

Thank you in advance,

Jim

[Czarek Tomczak]

On Friday, September 27, 2013 2:20:24 PM UTC+2, Jim Bourekas wrote:

When I have an open website form within CefSharp and navigate away, I get the familiar "Are you sure you want to navigate away from this page?" message. 

Is there a way to avoid this message? It currently blocks my automations until the user clicks on the popup.

In CEF there is the CefJSDialogHandler::OnBeforeUnloadDialog() callback:

  ///
  // Called to run a dialog asking the user if they want to leave a page. Return
  // false to use the default dialog implementation. Return true if the
  // application will use a custom dialog or if the callback has been executed
  // immediately. Custom dialogs may be either modal or modeless. If a custom
  // dialog is used the application must execute |callback| once the custom
  // dialog is dismissed.
  ///
  /*--cef(optional_param=message_text)--*/
  virtual bool OnBeforeUnloadDialog(CefRefPtr<CefBrowser> browser,
                                    const CefString& message_text,
                                    bool is_reload,
                                    CefRefPtr<CefJSDialogCallback> callback) {
    return false;
  }

https://code.google.com/p/chromiumembedded/source/browse/trunk/cef3/include/cef_jsdialog_handler.h?r=r1450#97

Regards,

Czarek 

[Jim Bourekas]

Thanks Czarek,

I'm not sure I understand. I am using the CEF1 implementation with the WPF dlls. Is there an option that I can use or do I have to recompile the dlls overriding the CefJSDialogHandler? I am afraid that I might break something.

Regards,

Jim

[Czarek Tomczak]

Jim,

On Saturday, September 28, 2013 1:59:04 PM UTC+2, Jim Bourekas wrote:

I'm not sure I understand. I am using the CEF1 implementation with the WPF dlls. Is there an option that I can use or do I have to recompile the dlls overriding the CefJSDialogHandler? I am afraid that I might break something.

The link I shared with you is for CEF 3.

In CEF 1 the OnBeforeUnloadDialog() callback does not exist, but there is the OnJSConfirm() callback,

but I'm not sure if this will work for the "onunload" case, need to be tested:

https://code.google.com/p/chromiumembedded/source/browse/trunk/cef1/include/cef_jsdialog_handler.h?r=r1450#61

I don't know if any these APIs were exposed to CefSharp, you need to check that out yourself.

-Czarek

[Jim Bourekas]

Dera Czarek,

Why is the "onunload" responsible for this popup?

Thanks

jim

[Czarek Tomczak]

On Saturday, September 28, 2013 3:35:43 PM UTC+2, Jim Bourekas wrote:

Why is the "onunload" responsible for this popup?

Did you try google?

-Czarek 

[Jim Bourekas]

Ok, you have a point there. 

I just did google it and it seems that I could just override the window.onbeforeunload behaviour every time that a page was loaded. This way I would prevent the popup by returning null to the user.

Unless I could tap into the places in the code that you are referring to and override the CefSharp behaviour.

Is this about right?

Thanks again,

Jim

[Czarek Tomczak]

On Saturday, September 28, 2013 5:02:26 PM UTC+2, Jim Bourekas wrote:

I just did google it and it seems that I could just override the window.onbeforeunload behaviour every time that a page was loaded. This way I would prevent the popup by returning null to the user.

Unless I could tap into the places in the code that you are referring to and override the CefSharp behaviour.

Yes, that's about it.

-Czarek 

[Jim Bourekas]

Cool, thanks a lot Czarek!

jim

[Jim Bourekas]

For anyone who may be interested, here's how I did it:

I implemented the IJsDialogHandler interface:

public bool OnJSAlert(IWebBrowser browser, string url, string message)

        {

            return false;

        }

        public unsafe bool OnJSConfirm(IWebBrowser browser, string url, string message, bool* retval)

        {

            *retval = true; //this helps to avoid the "navigation away" popup

            return true;

        }

        public unsafe bool OnJSPrompt(IWebBrowser browser, string url, string message, string defaultValue, bool* retval, ref string result)

        {

            return false;

        } 

This did the trick

Regards,

Jimb

[Jim Bourekas]

I forgot one line: 

webviewer.JsDialogHandler = this;