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Drupal 8 Development Cookbook

Drupal 8 Development Cookbook

By : Matt Glaman
4.7 (3)
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Drupal 8 Development Cookbook

Drupal 8 Development Cookbook

4.7 (3)
By: Matt Glaman

Overview of this book

Began as a message board, Drupal today is open source software maintained and developed by a community of over 1,000,000 users and developers. Drupal is used by numerous local businesses to global corporations and diverse organizations all across the globe. With Drupal 8’s exciting features it brings, this book will be your go-to guide to experimenting with all of these features through helpful recipes. We’ll start by showing you how to customize and configure the Drupal environment as per your requirements, as well as how to install third-party libraries and then use them in the Drupal environment. Then we will move on to creating blocks and custom modules with the help of libraries. We will show you how to use the latest mobile-first feature of Drupal 8, which will help you make your apps responsive across all the major platforms. This book will also show you how to incorporate multilingual facilities in your sites, use web services and third-party plugins with your applications from inside Drupal 8, and test and deploy your apps.
Table of Contents (14 chapters)
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Creating an event subscriber


New to Drupal 8 is the event dispatcher system. One of the many benefits of Drupal is the ability to react to specific processes and alter or react to them. Unlike the hook system that exists in Drupal 8, and has for many versions of Drupal, the event dispatch system uses explicit registration to an event.

The events dispatcher system comes from the Symfony framework and allows components to easily interact with one another. Within Drupal, and integrated Symfony components, events are dispatched, and event subscribers can listen to the events and react to changes or other processes.

In this recipe, we will subscribe to the REQUEST event, which fires when a request is first handled. If the user is not logged in, we will navigate them to the login page.

How to do it...

  1. Create src/EventSubscriber/RequestSubscriber.php in your module.
  2. Define the RequestSubscriber class, which implements the EventSubscriberInterface interface:
<?php

 namespace Drupal\mymodule\EventSubscriber...

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