Browsers back button click with confirm box

Question

Need to create the javascript confirm pop up on click of browsers back button. If I click on back button pop up will come up and say "you want to go ahead ?" if click on Yes then it would have redirected to previous page.

I have following code it is not working as per the requirement.

if(window.history && history.pushState){ // check for history api support
        window.addEventListener('load', function(){

            // create history states
            history.pushState(-1, null); // back state
            history.pushState(0, null); // main state
            history.pushState(1, null); // forward state
            history.go(-1); // start in main state

            this.addEventListener('popstate', function(event, state){
                // check history state and fire custom events
                if(state = event.state){

                    event = document.createEvent('Event');
                    event.initEvent(state > 0 ? 'next' : 'previous', true, true);
                    this.dispatchEvent(event);

                    var r = confirm("Would you like to save this draft?");
                    if(r==true) { 
                        // Do nothing      

                    } else {  
                       self.location = document.referrer;    
                    }
                    // reset state
                    history.go(-state);

                }
            }, false);
        }, false);
    }

Any help in this would be really appreciable.

Answer 1

/* Prevent accidental back navigation click */
history.pushState(null, document.title, location.href);
window.addEventListener('popstate', function (event)
{
    const leavePage = confirm("you want to go ahead ?");
    if (leavePage) {
        history.back(); 
    } else {
        history.pushState(null, document.title, location.href);
    }  
});

Answer 2

Try this: it's simple and you get total control over the back button.

if (window.history && history.pushState) {
    addEventListener('load', function() {
        history.pushState(null, null, null); // creates new history entry with same URL
        addEventListener('popstate', function() {
            var stayOnPage = confirm("Would you like to save this draft?");
            if (!stayOnPage) {
                history.back() 
            } else {
                history.pushState(null, null, null);
            }
        });    
    });
}