I use drupalSettings to send config data to javascript. But when I edit my config, the javascript object is not modified, I have to clear all cache to get the update. The cache metadata in http headers show me that the page is linked to my 'config:my_module.settings' tag but the inline drupalSettings declaration is left unchanged.

What's the way to add cache metadata to:

//or in hook_preprocess_hook ()

Or is there a function that could rebuild drupalSettings ?

1 Answer 1


When you add attachments you can add cache data as well:

$attachments['#cache']['tags'][] = 'config:my_module.settings';

BTW #attached and #cache are the only data you are allowed to add in hook_page_attachments() or hook_page_attachments_alter().

  • That's seems correct, but sorry I copy past the example form the official doc and forgot to point that I actually add the settings in a hook_preprocess_hook using $variables['#attached']['drupalSettings']...
    – Teenage
    Commented Feb 21, 2018 at 15:03
  • then set the cache metadata in $variables['#cache']
    – 4uk4
    Commented Feb 21, 2018 at 15:09
  • I don't think so, the cache metadata will be linked to the region and not passed to the #attache, no ?
    – Teenage
    Commented Feb 21, 2018 at 15:35
  • 1
    #attached and #cache are both bubbleable metadata, if one of them is passed then the other is too.
    – 4uk4
    Commented Feb 21, 2018 at 16:04
  • Yes, but bubbling only affects parents not siblings, the Drupalsettings "region" is in the bottom of the page and so is left "untouched", no ? If I follow you correctly the Drupalsettings should inherit the same metadata as the page, it doesn't seems to work for me... Anyway, I will try to use hook_page_attachememts to add the cache metadata
    – Teenage
    Commented Feb 21, 2018 at 22:03

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