If you want to make menu active using jQuery after form load use my following code. You can also use this code if you have ul/ li and want to add active class to selected li.

<ul>
  <li><a href="https://www.blogger.com/page1.php">page 1</a></li>
  <li><a href="https://www.blogger.com/page2.php">page 2</a></li>
</ul>

$('li').each(function(){
    if(window.location.href.indexOf($(this).find('a:first').attr('href'))>-1)
    {
    $(this).addClass('active').siblings().removeClass('active');
    }
});