prevent onbeforeunload to close page in any case

Question

I want to prevent browser to close page in any case or in other case, Prevent browser to do anything when onbeforeunload is called. Here is my code which i have tried.

 (function() {
    var proxied = window.onbeforeunload;
    window.onbeforeunload = function(e) {
        e.preventDefault();
        e.stopPropagation();
            //i want to stop everything
        console.log('stay here');
        // return 'message';
    };
})();

• I want to perform a action before leaving the page (disconnect the chat)

Answer 1

You can't outright prevent a user from leaving the page (This would lead to much abuse on spam/advertisement sites who try to get you to stay on a page), but you can show things such as a window which causes a confirm prompt to the user. Have a look at Prevent a webpage from navigating away using JavaScript which can lead you to the right direction of what you're trying to accomplish.