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I am running Drupal 9.1.7 on lando on a Mac. I am writing a custom module and I want to include the Highcharts library. The .libraries.yml file looks like this.

stats_degrees:
  js:
    https://code.highcharts.com/highcharts.js: { type: external, minified: false }
  dependencies:
    - core/jquery

From reading the documentation, I believe I should see the Highcharts library at the bottom of every page when I view the source, but I don't see it anywhere.

Am I missing something?

I have already validated the YAML content. I also installed the Charts module, if that makes any difference.

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1 Answer 1

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Defining the library is only half of the process. Libraries are not loaded on every page by default - you need to tell Drupal when it should include your library.

For full details, see the Attaching a library to page(s) section of the Adding stylesheets (CSS) and JavaScript (JS) to a Drupal module documentation on drupal.org.

I bet you want to attach the library to a render array:

$build['the_element_that_needs_asset_library']['#attached']['library'][] = 'your_module/library_name';

Or attach the library in a twig template (the template that produces your chart markup):

{{ attach_library('your_module/library_name') }}
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  • Yes! I am trying to attach it to a render array like so: $chart['#attached']['library'][] = 'stats_degrees/highcharts'; $chart['#type'] = 'chart'; $chart['#chart_type'] = 'line'; $chart['#chart_library'] = 'highcharts'; etc. But when I return the array: return render($chart); it is always null and there is no Highcharts JS when I view source. This approach worked in D7 but D7 handled JS libraries differently and drupal_render() has been replaced by render().
    – Dorian Winterfeld
    Commented Jun 30, 2021 at 18:32
  • 1
    You usually shouldn't render a render array by calling render, you should just return it. That's the first thing that I would try. See drupal.org/docs/theming-drupal/twig-in-drupal/…
    – sonfd
    Commented Jun 30, 2021 at 19:07
  • I am doing it for debugging in PHP Storm, $rendered = \Drupal::service('renderer')->renderPlain($chart);. When I drill into the debugger I see that Renderer::executeInRenderContext() is returning null. There must be something amiss with my render array... maybe we should close this thread and I will open a new one after I do more debugging.
    – Dorian Winterfeld
    Commented Jul 1, 2021 at 15:14
  • Yeah, that seems like a good idea. It sounds like you know how to attach the library properly, but there's a problem with your render array.
    – sonfd
    Commented Jul 1, 2021 at 23:38
  • I installed the highcharts library using composer. It installed it under /libraries. Makes sense. How do I reference this in my .libraries.yml file? I tried making it relative to my module ../../../libraries/highcharts/highcharts.js: { } but I still don't see it in the page source. I have tried attaching it to my render array and in a twig template like this: {{ attach_library('stats_degrees/highcharts') }} but I still don't see it.
    – Dorian Winterfeld
    Commented Jul 2, 2021 at 14:32

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