How do I pass a value from PHP to JavaScript from a function that returns a render array?

I’m trying to send a variable to my JavaScript. I would like to send a class name to my twig template and the same class-name to my javascript from a function that returns a render array. The function is called from a routing yml to display a page from a link in a page (which is beside the point).

The returned render array is similar to the following one.

return [   '#theme' => 'theme_name',   '#form' => $form,   '#data' => [     'customer' => $obj_customer,     'customer_subscription' => $obj_customer->getSubscription(),     'subscriptions_explanation' => $arr_subscription_text,   ] ]; 

Passing data from PHP to javascript variable available to all pages in Drupal 8 says you can do something with '#attached' => ['drupalSettings' => ['do' => $something]] in hook_page_attachments(), but that doesn’t seem to apply to the method I am using.

How can I do in my case? Adding stylesheets (CSS) and JavaScript (JS) to a Drupal theme doesn’t seem to cover this use case.

In my JavaScript I define my JS functions inside:

(function ($, Drupal, drupalSettings) {   Drupal.behaviors.portalCore = {     someFunction() {       ...     }   }; }); 

Is there perhaps a way to attach a variable to the portalCore from my example code?

This article was republished from its original source.
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How do I pass a value from PHP to JavaScript from a function that returns a render array?

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