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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.
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.
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).
return $suggestions; at the end since that variable is passed by reference.