Whao, that wasn't as easy as I thought. I wanted to print out the two top level breadcrumb elements, without "Home", with node title in a custom block. I tried it in many different ways but ran into surprises every time. So finally I'd like to share my code with you, if you should run into the same situation:
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| <?php | |
| namespace Drupal\custom_breadcrumb_block\Plugin\Block; | |
| use Drupal\Core\Block\BlockBase; | |
| use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface; | |
| use Drupal\Core\Plugin\ContainerFactoryPluginInterface; | |
| use Drupal\Core\Routing\RouteMatchInterface; | |
| use Symfony\Component\DependencyInjection\ContainerInterface; | |
| use Drupal\Core\Controller\TitleResolverInterface; | |
| /** | |
| * Provides a 'Breadcrumb' Block. | |
| * | |
| * @Block( | |
| * id = "custom_breadcrumb_block", | |
| * admin_label = @Translation("Custom Breadcrumb block"), | |
| * category = @Translation("Custom Blocks"), | |
| * ) | |
| */ | |
| class CustomBreadcrumbBlock extends BlockBase implements ContainerFactoryPluginInterface { | |
| /** | |
| * The breadcrumb manager. | |
| * | |
| * @var \Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface | |
| */ | |
| protected $breadcrumbManager; | |
| /** | |
| * The current route match. | |
| * | |
| * @var \Drupal\Core\Routing\RouteMatchInterface | |
| */ | |
| protected $routeMatch; | |
| /** | |
| * The title resolver service. | |
| * | |
| * @var \Drupal\Core\Controller\TitleResolverInterface | |
| */ | |
| protected $titleResolver; | |
| /** | |
| * Constructs a new CustomBreadcrumbBlock object. | |
| * | |
| * @param array $configuration | |
| * A configuration array containing information about the plugin instance. | |
| * @param string $plugin_id | |
| * The plugin_id for the plugin instance. | |
| * @param mixed $plugin_definition | |
| * The plugin implementation definition. | |
| * @param \Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface $breadcrumb_manager | |
| * The breadcrumb manager. | |
| * @param \Drupal\Core\Routing\RouteMatchInterface $route_match | |
| * The current route match. | |
| * @param \Drupal\Core\Controller\TitleResolverInterface $titleResolver | |
| * The title resolver. | |
| */ | |
| public function __construct(array $configuration, $plugin_id, $plugin_definition, BreadcrumbBuilderInterface $breadcrumb_manager, RouteMatchInterface $route_match, TitleResolverInterface $titleResolver) { | |
| parent::__construct($configuration, $plugin_id, $plugin_definition); | |
| $this->breadcrumbManager = $breadcrumb_manager; | |
| $this->routeMatch = $route_match; | |
| $this->titleResolver = $titleResolver; | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) { | |
| return new static( | |
| $configuration, | |
| $plugin_id, | |
| $plugin_definition, | |
| $container->get('breadcrumb'), | |
| $container->get('current_route_match'), | |
| $container->get('title_resolver') | |
| ); | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function build() { | |
| $breadcrumbs = $this->breadcrumbManager->build($this->routeMatch)->getLinks(); | |
| $items = []; | |
| if(!empty($breadcrumbs[1])){ | |
| $items[] = $breadcrumbs[1]->getText(); | |
| } | |
| if(!empty($breadcrumbs[2])){ | |
| $items[] = $breadcrumbs[2]->getText(); | |
| } | |
| // Fallback: Page title | |
| $request = \Drupal::request(); | |
| $page_title = $this->titleResolver->getTitle($request, $this->routeMatch->getRouteObject()); | |
| if(!empty($page_title)){ | |
| $items[] = $page_title; | |
| } | |
| return [ | |
| '#type' => 'inline_template', | |
| '#template' => ' | |
| <div class="custom-markup-block"> | |
| <div class="first"> | |
| {{ linkFirst }} | |
| </div> | |
| {% if linkSecond is not empty %} | |
| <div class="second"> | |
| {{ linkSecond }} | |
| </div> | |
| {% endif %} | |
| </div>', | |
| '#context' => [ | |
| 'linkFirst' => !empty($items[0]) ? $items[0] : NULL, | |
| 'linkSecond' => !empty($items[1]) ? $items[1] : NULL, | |
| ], | |
| '#cache' => array( | |
| 'contexts' => array('url.path'), | |
| ), | |
| ]; | |
| } | |
| } |
