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Creating Your First Module

Now that we have covered some of the introductory aspects of Drupal 8 module development, it’s time to dive right into the meat of what we are doing here--module creation.

Here are some of the important topics that we will cover in this chapter:

Creating a new Drupal 8 module--the files that are necessary to get started
Creating a route and controller
Creating and using a service
Creating a form
Creating a custom block
Working with links
Using the Event Dispatcher

Concretely, in this chapter, we will create a new custom module called Hello World. In this module, we will define a route that maps to a Controller and that outputs the age-old programming message. So, this will be our first win.

Next, we will define a service that our Controller will use to pimp up our message. After all, we don't want the same message presented to the user...

Key benefits

Unleash the power of Drupal 8 programming by creating efficient modules and extensions

Explore a plethora of Drupal 8 APIs and get the best out of them using the power of PHP coding

Learn to implement efficient data management and data security by creating dedicated modules for it.

Description

Drupal is an open source web-based content management system (CMS) that can be used for building anything from simple websites to complex applications. It enables individuals and organizations to build platforms that engage users and deliver the right content at the right time. Drupal 8 is an exciting new development in the Drupal community. However, the differences from the previous version are substantial and this can put quite some pressure on Drupal 7 developers that need to catch up. This book aims to help such developers in getting up to speed with Drupal 8 module development. The book first introduces you to the Drupal 8 architecture and its subsystems before diving into creating your first module with basic functionality. Building upon that, you will cover many core APIs and functionalities available to module developers. You will work with the Drupal logging and mailing systems, learn how to output data using the theme layer and work with menus and links programmatically. Then, you will learn how to work with different kinds of data storages, create custom entities, field types and leverage the Database API for lower level database queries. Moreover, you will learn about the Drupal 8 access system and caching layer as well as the APIs used for data processing (queues and batches). You will further see how to introduce javascript into your module, work with the various file systems and ensure the code you write works on multilingual sites. Finally, you will learn how to programmatically work with Views, write automated tests for your functionality and also write secure code in general. By the end of the book, you will have learned how to develop your own custom module from scratch that can help solve a small problem or even provide complex functionality. And who knows, maybe you’ll even contribute it back to the Drupal community.

Who is this book for?

The primary target of this book is Drupal developers who want to learn how to write modules and carry out development in Drupal 8. It is also intended for Drupal site builders and PHP developers who have basic Object Oriented Programming skills. A little bit of Symfony experience is helpful but not mandatory.

What you will learn

Write a Drupal 8 module with custom functionality and hook into various extension points

Master numerous Drupal 8 sub-systems and APIs

Model, store, and manipulate data in various ways and for various purposes

Display data and content in a presentable and secure way

Learn about the theme system and render arrays

What do you get with Print?

Instant access to your digital eBook copy whilst your Print order is Shipped

Paperback book shipped to your preferred address

Download this book in EPUB and PDF formats

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Asiq Apr 24, 2019

Great book if you want to learn Drupal8.

Amazon Verified review

James Danforth Feb 15, 2018

Excellent is an understatement. This book is allowing me to get up to speed on Drupal 8 development at least 10X faster than if I had to sort through all the Drupal 8 documentation on my own. The book is my train into a big Drupal territory. If you need to develop in version 8 and you need to get fast track information on how to do it well, fast, this is the book for you. The book vastly flattens out the early part of Drupal 8's learning curve for those without a lot of experience with it. I would buy it again for sure.

Amazon Customer Jul 19, 2018

Very good book for Drupal developers.

M.G. Aug 14, 2019

Throughly conceived, and brilliantly executed. A really good resource for an in-depth look at Drupal 8's many aspects. Use it for reference all the time.

William A. Kudrle Jun 09, 2018

I am surprised that this has not gotten more reviews. I have not found another book that is as thorough and in-depth about how Drupal 8 works. It goes over custom module development, as the title implies, but it also goes into depth about how the internals of Drupal 8 work as well. Many improvements have been made to the internals of Drupal 8, but it is difficult to know many of them unless you have a text like this to guide you. I liken this book to what Pro Drupal Development by John Van Dyke was for Drupal 6. Reading through Van Dyke's book was what gave me the ability to actually create custom Drupal 6 modules. This book is doing that for me for Drupal 8. The only criticism that I would have is that it would be nice to have more details about how to use the Drupal console to create custom modules and plugins. That may be too much of a moving target, but in practical terms just getting the basic modules and plugins to be generated with Drupal console can be a confidence boost and provide some understanding from the immediate feedback of the basic custom code.I highly recommend this book if you really want to understand what is going in with Drupal 8 and/or intend to do any custom programming.

Drupal 8 Module Development: Build and customize Drupal 8 modules and extensions efficiently

What do you get with Print?

Drupal 8 Module Development

Creating Your First Module

Creating a module

Using services in Drupal 8

Blocks

Working with links

The URL

Event Dispatcher and redirects

Redirecting...

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