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Drupal 9 block using node context. Works for node pages, node revision pages and node previews.
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| <?php | |
| namespace Drupal\title_block\Plugin\Block; | |
| use Drupal\Core\Block\BlockBase; | |
| /** | |
| * Provides a block rendering the title of the current node. | |
| * | |
| * @Block( | |
| * id = "title_block_new", | |
| * admin_label = @Translation("Current node title (new)"), | |
| * category = @Translation("Title Block"), | |
| * context_definitions = { | |
| * "node" = @ContextDefinition("entity:node", label = @Translation("Node")) | |
| * } | |
| * ) | |
| */ | |
| class NewBlock extends BlockBase { | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function build(): array { | |
| $node = $this->getContextValue('node'); | |
| if (!$node) { | |
| return []; | |
| } | |
| $build['content'] = [ | |
| '#markup' => $node->label(), | |
| ]; | |
| return $build; | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function getCacheMaxAge() { | |
| // Disable block caching on preview pages to handle recurring previews, | |
| // which would be cached otherwise (same url used for one edit session). | |
| $preview = \Drupal::service('current_route_match') | |
| ->getRawParameter('node_preview'); | |
| if ($preview) { | |
| return 0; | |
| } | |
| } | |
| } |
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