What is drupal behaviors ?

Drupal behaviors allow to execute javascpts in particular context and / or pass data from drupal to client side java script.

This system allow you to invalidate drupal cache using a 'tag'

Exapples:

Example 1. Basic inline template

    $output[] = [

      '#type' => 'inline_template',

      '#template' => '{{ yourvar }}',

      '#context' => [



Drupal Console is the new CLI for Drupal. Drupal Console is a tool to generate boilerplate code, interact and debug Drupal. From the ground up, it has been built to utilize the same modern PHP practices which were introduced in Drupal 8.

Example : Execute JS only in the front page.

This Script run whin the body tag contains class='front'