The Flexibility of Drupal 8

1 // Implements hook_preprocess_HOOK(). 2 function flex_module_preprocess_menu__main(&$variables) { 3 // Loop through all menu tabs. 4 foreach ($variables[‘items’] as &$menu_tab) { 5 // Current tab pointing to node/6 ? 6 if ($menu_tab[‘url’]->toString() == ‘/node/6’) { 7 // Alter Title 8 $menu_tab[‘title’] .= ’ Alt’; 9 // Existing attributes? 10 $attributes = $menu_tab[‘url’]->getOption(‘attributes’); 11 // Add custom styling. 12 $attributes[‘style’] .= ‘color:#FFF;background:#F00;’; 13 // Add back modified attributes. 14 $menu_tab[‘url’]->setOption(‘attributes’, $attributes); 15 } 16 } 17 } module/custom/flex_module/flex_module.module Implement a preprocess hook targeted at the main menu. Loop through all the menu items and alter any that point to node/6

1 namespace Drupal\flex_module; 2 3 use Drupal\Core\DependencyInjection\ServiceProviderBase; 4 use Drupal\Core\DependencyInjection\ContainerBuilder; 5 6 class FlexModuleServiceProvider extends ServiceProviderBase { 7 /** 8 * {@inheritdoc} 9 */ 10 public function alter(ContainerBuilder $container) { 11 // Override menu_link_tree class with custom. 12 $definition = $container->getDefinition(‘menu.link_tree’); 13 $definition->setClass(‘Drupal\flex_module\FlexModuleMenuLinkTree’); 14 } 15 } modules/custom/flex_module/src/FlexModuleServiceProvider.php Need to create a *ServiceProvider class that extends the ServiceProviderBase class (line 6). Will override the ‘alter’ method (lines 10 -14), and change the PHP class uses for the menu Tree service (lines 12 - 13)

1 namespace Drupal\flex_module; 2 use Drupal\Core\Menu\MenuLinkTree; 3 4 class FlexModuleMenuLinkTree extends MenuLinkTree { 5 // Overrides \Drupal\Core\Menu\MenuLinkTree::build(). 6 public function build(array $tree) { 7 $build = parent::build($tree); 8 if (isset($build[‘#items’]) && $build[‘#theme’] == ‘menu__main’) { 9 $n = 0; 10 foreach ($build[‘#items’] as &$item ) { 11 if (++$n == 8) { 12 // Change Title, path and add styling. 13 $item[‘title’] .= ’ Alt’; 14 $item[‘url’]->setOption(‘attributes’, array( 15 ‘style’ => ‘color:#00F;background:#FFA500;’, 16 )); 17 } 18 } 19 } 20 return $build; modules/custom/flex_module/src/FlexModuleMenuLinkTree.php 21 } Create a new service class that extends the core MenuLinkTree service (line 4). Will override the core ‘build’ method, so that can use custom logic to tartget the 8th main menu item.