problem with beforeunload event in WebBrowser control c# winform

Question

I have written logic to logout from web application in beforeunload even, as follows:

window.addEventListener("beforeunload", function (event) {  
   //Logout logic
   //Calling logout api with values from session
   //clearing the session on success 
});

it is working fine in all web browsers (IE, Mozilla, Chrome), however It is not working from WebBrowser control in winform application.

What could be the reason behind it?

PS: there is nothing wrong with javascript, when I call this same script by invoking it as below, it works fine:

   HtmlElement head = webBrowser4.Document.GetElementsByTagName("head")[0];
   HtmlElement scriptEl = webBrowser4.Document.CreateElement("script");
   IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;
   element.text = @"function Logout() {
   $.ajax({
         url: '/api/Logout',
         type: ""GET"",
         contentType: ""application/json;charset=utf-8"",
         success: function(returnVal) {
                    },
         complete: function() {
                     sessionStorage.clear();
                    },
         error: function(returnVal) {
                        }
                    });
                 }";
     head.AppendChild(scriptEl);
     webBrowser4.Document.InvokeScript("Logout");

What is the problem with beforeunload event in WebBrowser control in winform?

Try to use InvokeScript method, here is a thread stackoverflow.com/questions/7322420/… — Pavel Anikhouski
– Pavel Anikhouski, Commented Feb 26, 2019 at 12:15
What if I don't have control over the logout implementation in the future? — YoungMonk
– YoungMonk, Commented Feb 26, 2019 at 12:46
If you expect to handle it in close event of the form, it will not work. But if you expect it work when navigating to another address, it works properly. — Reza Aghaei
– Reza Aghaei, Commented Feb 26, 2019 at 13:49
Just in case you want user start a new session (not being logged in) when you open your application, you can disable cache and cookies. Take a look at this example. — Reza Aghaei
– Reza Aghaei, Commented Feb 26, 2019 at 13:55
@RezaAghaei thanks for your help, but because of application requirements this will not work for me. — YoungMonk
– YoungMonk, Commented Feb 27, 2019 at 5:55

Koxo · Accepted Answer · 2019-02-26 13:56:50Z

0

Did you try it without listener?

window.onbeforeunload = function(event)

answered Feb 26, 2019 at 13:56

Koxo

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