I have a subtheme called bootstrap_subtheme. It has a library called global-styling. I created a custom module called telephone_alter. In telephone_alter.module, I have the following:

function telephone_alter_form_user_form_alter(&$form){
  $form['#attached']['library'][] = 'bootstrap_subtheme/global_styling';

it does not load the bootstrap_subtheme library stylesheet. I do dump($form) and get the following:

  "#attached" => array:1 [▼
    "placeholders" => array:1 [▼
      "form_action_p_pvdeGsVG5zNF_XLGPTvYSKCf43t8qZYSwcfZl2uzM" => array:1 [▼
        "#lazy_builder" => array:2 [▶]

seems like the attachment isn't even grabbing it. Yes I am using the right form alter according to the api: hook_form_FORM_ID_alter() and my ID is user_form . It does fire off, if I attach css from within my module's folder, but not my subtheme. Any help would be great! Thank you.

One more note:

my root dir is as follows:


Here is bootstrap_subtheme.libraries.yml:

    js/popper.min.js: {}
    js/bootstrap.min.js: {}
    js/global.js: {}
      css/style.css: {}
    - core/jquery
    - core/drupal
  • Show us your bootstrap_subtheme.libraries.yml file too
    – beltouche
    Aug 11, 2020 at 2:43
  • @beltouche editted the post to include bootstrap_subtheme.libraries.yml Aug 11, 2020 at 5:59

1 Answer 1


Based on that structure, you're referencing the library incorrectly. It should be $form['#attached']['library'][] = 'bootstrap_subtheme/bootstrap_subtheme.global-styling';

As noted in a comment below, the duplicate use of the theme name may not be necessary, and $form['#attached']['library'][] = 'bootstrap_subtheme/global-styling'; should work according to the docs. (Note the use of a dash, matching the library name versus an underscore in your code.)

  • 1
    This is not true, the syntax used in the question is correct. It is simply module_name/library_name. No need to repeat the module name after the slash.
    – Hudri
    Aug 11, 2020 at 17:11
  • Interesting. Every case I've had in my experience, I have the module name there, although I see in the docs, there's no requirement for it. It just be the author's use of an underscore versus a hyphen then.
    – beltouche
    Aug 11, 2020 at 18:01
  • @Hudri @beltouche it was the simple hyphen in global-styling that was my mistake Aug 11, 2020 at 20:13

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