How to disable javascript unload event in webbrowser control c#?

Question

I am using a webbrowser control to navigate to a site that has a JavaScript unload event. When I attempt to navigate elsewhere, a popup appears prompting me if I want to "Stay On Page" or "Leave Page". If I keep attempting to navigate away, a COMException is thrown.

How can I prevent popups like these from occurring in my webbrowser?

How can I disable Javascript when I am ready to navigate to another webpage?

Answer 1

You can do something like this (Delphi code):

var
  WrkIHTMLWindow2: IHTMLWindow2;
  WrkIHTMLWindow2Disp: IHTMLWindow2Disp;
begin
  WrkIHTMLWindow2 := IHTMLDocument2Disp(WrkIWebBrowser2.Document).parentWindow;
  if WrkIHTMLWindow2.QueryInterface(IHTMLWindow2Disp, WrkIHTMLWindow2Disp) = S_OK then
    if not VarIsNull(WrkIHTMLWindow2Disp.onbeforeunload) then
      WrkIHTMLWindow2Disp.onbeforeunload := NULL;