Is it possible preprocess variables only for certain blocks?
I have created such function: mytheme_preprocess_block__aggregator(&$vars) but it doesn't works.
-- EDIT --
It seems to be fixed in Drupal 8 https://drupal.org/node/1751194
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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? – leymannx Nov 17 '16 at 20:56
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
}
}
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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. – kiamlaluno♦ Apr 7 '11 at 15:37 -
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2Please make use of
$variables['block']->bidand not$variables['block_id']as 'block_id' is not unique to that block. – Duncanmoo Sep 5 '13 at 9:42 -
3I think its a little friendlier to conditionally switch on
$variables['block']->deltaif$variables['block']->module == 'MODULE'– Pete May 16 '14 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(&$variables). – leymannx Nov 15 '16 at 12:24 -
1
mytheme_preprocess_block__{my_block_machine_name}(&$variables)does work on D8.3 – Tim Mar 17 '17 at 16:43
