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Since Drupal 8 it is not possible with template naming conventions to load a specific block template according to the region it is placed in ("Per-region block markup and per-region block templating feature removed"). But I need to have different html for blocks if placed in a certain region. How do I accomplish this?

I've thought about using MYMODULE_theme_suggestions_block_alter but I don't know how to get the current region.

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1 Answer 1

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You can get region if you get Block Entity.

.module or .theme file

use Drupal\block\Entity\Block;

function MODULE_theme_suggestions_block_alter(array &$suggestions, array $variables) {
  if (!empty($variables['elements']['#id'])) {
    $block = Block::load($variables['elements']['#id']);
    $suggestions[] = 'block__' . $block->getRegion() . '__' . $variables['elements']['#id'];
  }
  /* Use this 'else if' only if you are using page_manager module and want to know which region is the block */
  else if (isset($variables['elements']['#configuration']['region'])) {
    $suggestions[] = 'block__page_' . $variables['elements']['#configuration']['region'] . '__' . end(explode(':', $variables['elements']['#plugin_id']));
  }
  return $suggestions;
}

Edit 1: Cover page_manager module case.

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  • Almost perfect. You need to add an isset() to make sure that the #id is really there. For example, if you use page_manager and place blocks in there, then you won't have an #id.
    – Berdir
    Feb 25, 2016 at 20:22
  • @Berdir thanks ;) . I think that in this case isset() is not required, because if there isn't an #id, then it pass NULL to ::load function, and just return NULL. In the end, $block is NULL and nothing will happen. Tested in my dev env Drupal 8.0.4 - page_manager-1.0-alpha23 (never used this module before).
    – Vagner
    Feb 25, 2016 at 23:40
  • Yes, isset() is required. accessing an array key that doesn't exist results in a PHP notice. Check your logs and you'll see. I would recommend to always develop with error display on verbose, which is the default of the provided example settings.php.
    – Berdir
    Feb 26, 2016 at 0:12
  • You don't need return $suggestions; at the end since that variable is passed by reference.
    – BWPanda
    Nov 13, 2020 at 1:35

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