Is it possible preprocess variables only for certain blocks?
I created mytheme_preprocess_block__aggregator(&$vars), but it doesn't work.
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The edit you did and the link you pasted there seems to only deal with theme hook suggestions, doesn't it?– leymannxCommented Nov 17, 2016 at 20:56
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3 Answers
Unfortunately, there is no way to do it like that (similar to hook_form_alter()).
The best way to do this would be to use $variables['block']->bid to apply modifications only to the blocks you want:
function mytheme_preprocess_block(&$variables) {
if ($variables['block']->bid === 'target_block_id') {
// do something for this block
} else if ($variables['block']->bid === 'other_target_block_id') {
// do something else for this other block
}
}
answered Apr 7, 2011 at 15:30
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4I looked at Drupal code, and Drupal doesn't looks for
hook_preprocess_block_MODULE()orTHEME_preprocess_block_MODULE(). It handle in a particular way the__contained in theme function names, whentheme()is invoked astheme('links__contextual__node', ...), for example.– avpaderno ♦Commented Apr 7, 2011 at 15:37 -
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'block_id' is usually the machine name of the block correct? Commented Sep 26, 2011 at 14:46
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2Please make use of
$variables['block']->bidand not$variables['block_id']as 'block_id' is not unique to that block. Commented Sep 5, 2013 at 9:42 -
3I think its a little friendlier to conditionally switch on
$variables['block']->deltaif$variables['block']->module == 'MODULE'– PeteCommented May 16, 2014 at 0:02
Just to confirm, in Drupal 8 you can write preprocess functions for specific blocks. For example:
Drupal 8
mytheme_preprocess_block__system_branding_block(&$vars) {
// Make changes to the the system branding block
}
But you could also use hook_preprocess_block, and the plugin ID:
function mytheme_preprocess_block(&$vars) {
if ($vars['plugin_id'] == 'system_branding_block') {
// Make changes to the the system branding block
}
}
As mentioned by Alex, in Drupal 7 you'll have to stick with HOOK_preprocess_block, and an id check:
Drupal 7
mytheme_preprocess_block(&$vars) {
if ($vars['block']->bid === 'target_block_id') {
// make changes to this block
}
}
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Tried it out right now on D8, neither
MYTHEME_preprocess_block__system_branding_block(&$vars)works nor doesMYTHEME_preprocess_block__page_title_block(&$variables).– leymannxCommented Nov 15, 2016 at 12:24 -
3
mytheme_preprocess_block__{my_block_machine_name}(&$variables)does work on D8.3– TimCommented Mar 17, 2017 at 16:43
In Drupal 10 (presumably 8 & beyond), you can dig into the $vars array to isolate a particular block type/bundle:
function mytheme_preprocess_block(&$vars){
$block_content = $vars['elements']['content']['#block_content'];
if($block_content instanceof \Drupal\block_content\Entity\BlockContent) {
$block_type = $block_content->bundle();
// Logic here based on a (custom) block type/bundle.
}
else{
/* A variety of system-generated blocks (logo, menu, etc.)
will have other kinds of info in $vars['elements']['content']
you may be able to key off of.
Views-generated blocks will also provide details
about the View and display in $vars['elements']['content'].
*/
}
}
