What is the proper way to add third party script snippets to head tag?

Question

I understand I can hard-code this snippet into html.html.twig but i would prefer a cleaner method. My research is only instructing me how to attach libraries etc, but I can't find any example of injecting code into the header area needed by some third-party services.

I tried the following code, but it doesn't seem to work.

/** * Implements hook_page_attachments(). */ function THEME_page_attachments(&$page) { /** * Initial JS. */ $javascript_header = "-----js code -----"; $page['#attached']['html_head'][] = [ // The data. [ // Add a <script> tag. '#tag' => 'script', // Add JavaScript to the <script> tag. '#value' => \Drupal\Core\Render\Markup::create($javascript_header), // Give weight so it appears after meta tags, etc. '#weight' => -1, ], 'key' ]; }

Community · Accepted Answer · 2017-04-13 12:47:02Z

Your issue seems to be related with hook_page_attachments() not called from mytheme.theme file. If you look to the answer, it's written -

It appears that this function is only callable from a module, as it is listed in Adding stylesheets (CSS) and JavaScript (JS) to a Drupal 8 module but not listed as a valid method in Adding stylesheets (CSS) and JavaScript (JS) to a Drupal 8 theme.

I verified with the current documentation & that's correct. You can use hook_page_attachments_alter, which has documented in above given document for Adding stylesheets and JS to a Drupal 8 theme.

Yes indeed. My code above works once I add alter to the function. Thank you. — drupalstrap
– drupalstrap, Commented Jan 18, 2017 at 9:55

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