Topic
Last updated September 6, 2017

Whether you're trying to add your own JavaScript to a page, or make use of one of the many popular libraries provided by Drupal core, it's important to understand the asset library system when working with JavaScript in Drupal. By wrapping your JavaScript in an asset library it can be added to every page, selectively included when it's needed, or be easily modified by others.

In addition to the inclusion of third party libraries, Drupal core also contains numerous Drupal-specific JavaScript libraries that make it easier to do things like implement AJAX calls to a Drupal route, localize UI strings, and pass configuration stored in the database to the front-end. Drupal also contains several external projects in core, like jQuery, Backbone, Underscore, and Modernizer.

Example tasks

  • Add custom JavaScript to a site
  • Utilize the JavaScript libraries that are included in Drupal core
  • Customize how JavaScript is loaded on a site to minimize the overall page size

Confidence

The addition of the asset library system in Drupal 8, while new, is quite well established. There may be emerging best practices regarding how to split up and structure your custom libraries, but the overall concepts are unlikely to change.

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