js: back button override; from http://stackoverflow.com/questions/6359327/detect-back-button-click-in-browser

back_button_override.js

window.onload = function () {
    if (typeof history.pushState === "function") {
        history.pushState("jibberish", null, null);
        window.onpopstate = function () {
            history.pushState('newjibberish', null, null);
            // Handle the back (or forward) buttons here
            // Will NOT handle refresh, use onbeforeunload for this.
        };
    }
    else {
        var ignoreHashChange = true;
        window.onhashchange = function () {
            if (!ignoreHashChange) {
                ignoreHashChange = true;
                window.location.hash = Math.random();
                // Detect and redirect change here
                // Works in older FF and IE9
                // * it does mess with your hash symbol (anchor?) pound sign
                // delimiter on the end of the URL
            }
            else {
                ignoreHashChange = false;   
            }
        };
    }
}

Can anyone explain me please ..why we are pushing null before popstate and again we are pushing null

what is jibberish" and 'newjibberish'

I think it is mock data

it does not working browser chrome on ios

so it seems that the code doesn't always work in Chrome, sometimes it works sometimes it doesn't. Anyone has an idea on how to adjust the code to always work in Chrome?

This doesn't seem to work in Chrome , anyone has an idea on how to make this work on Chrome ?