Update active state on scroll

active.js

$(function() {
var industriesResizeTimeout;
var lastElementScrolled = '';
 $(window).on('scroll', function () {
        var last = undefined;
        $('a[name]').each(function () {
          if(($(window).scrollTop() - ($(this).offset().top-155)) > 0) {
            last = $(this).attr('name');
          }
        });
        if( lastElementScrolled != last && last ) {
          lastElementScrolled = last;
          $('.menu > li').removeClass('active');
          $('li').removeClass('active');
          $('li a[href=#' + last + ']').parent().addClass('active');
        }
  
      });

});