components_block_title.js

/**
 * @file
 */

/**
 * Display the active parent menu item name above the sidebar subtree menu. 
 */
(function($) {

"use strict";

Drupal.behaviors.ComponentsBlockTitle = {
  attach: function (context) {

    // Only run on pages with a sidebar submenu.
    if ($('.region-sidebar-first #block-nama-d8-main-menu', context).length) {

      // Get the parent menu item name.
      var parentMenuItem = $('.region-primary-menu .menu-item--active-trail a', context).text();

      // Add it above the sidebar menu.
      $('<h2>' + parentMenuItem + '</h2>', context).insertBefore('.region-sidebar-first #block-nama-d8-main-menu');
    }

  }
};

})(jQuery);