a simple script to prevent user to going back in the browser.

dontGoBack.js

jQuery(document).ready(function($) {
if (window.history && window.history.pushState) {
  $(window).on('popstate', function() {
    var hashLocation = location.hash;
    var hashSplit = hashLocation.split("#!/");
    var hashName = hashSplit[1];
    if (hashName !== '') {
      var hash = window.location.hash;
      if (hash === '') {
        alert('Warning, if you press back button, you will lose your progress...');
      }
    }
  });
  window.history.pushState('forward', null, './'+option);
  }
});