Drupal subnav dropdown click code

dropdown_click.js

$('.menu-button').click(function() {
    $('.nav-bar .menu-block-wrapper').toggleClass('open');
  });

  var deep_links = $('.nav-bar .menu-block-wrapper li.is-expanded');

  $('> a', deep_links).click(function() {
    // Hide other open menus on desktop
    if(isScreen("desktop")) {
      $(this).parent().siblings().find('> a, ul').removeClass('activemenu');
    }

    $(this).siblings('ul').toggleClass('activemenu');
    $(this).toggleClass('activemenu');

    return false;
  });
  
  // Screen Helper
  // Requires matchMedia
  function isScreen(test_screen) {
    var real_screen;

    if(matchMedia('(max-width: 62.4375em)').matches) {
      real_screen = "mobile";
    } else {
      real_screen = "desktop";
    }

    if(real_screen == test_screen) {
      return true;
    } else {
      return false;
    }
  }