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Drupal 9 Module Development
Drupal 9 Module Development

Drupal 9 Module Development: Get up and running with building powerful Drupal modules and applications , Third Edition

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Drupal 9 Module Development

Chapter 2: Creating Your First Module

Now that we have covered some of the introductory aspects of Drupal 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 9 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 this age-old programming message. So, this will be our first win.

Next, we will define a service that our Controller will use to pimp out our message. After all, we don't want the same message presented to the user all day long. This simple example, however, will illustrate what services are and how to interact with the service container in order to make use of them.

Then, we will create a form where an administrator will be able to override the message shown on our page. It will be stored in configuration, and we will alter our service to make use of that configuration. The key takeaway here will be the use of the Form API. However, we will also discuss how to store some basic configuration values and add dependencies to our existing services.

Finally, we want to become a bit more flexible. Why should users only be greeted on a specific page? We will create a custom block that can be placed anywhere on the site and will display the same message. Here, we will see how block plugins are defined and how they can expose their own configuration forms to be more flexible.

Although not strictly related to our Hello World example, we will also look at how to work with links programmatically in Drupal. This is a very common task that any Drupal developer needs to do very often. Moreover, we will also look at using the Event Dispatcher component and, more importantly, subscribing to events. We'll illustrate this with a fairly common example of when you'd need to do this—performing redirects from incoming requests.

By the end of this chapter, you should have the foundational knowledge necessary to build your own module from scratch. Moreover, you should be able to understand and implement some of the most commonly used techniques in Drupal module development.

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Key benefits

  • Explore the essential Drupal 9 APIs for module development
  • Learn how to implement data modeling, caching, architecture, and much more in your Drupal applications
  • Discover what's new in the latest Drupal core release

Description

With its latest release, Drupal 9, the popular open source CMS platform has been updated with new functionalities for building complex Drupal apps with ease. This third edition of the Drupal Module Development guide covers these new Drupal features, helping you to stay on top of code deprecations and the changing architecture with every release. The book starts by introducing you to the Drupal 9 architecture and its subsystems before showing you how to create your first module with basic functionality. You’ll explore the Drupal logging and mailing systems, learn how to output data using the theme layer, and work with menus and links programmatically. Once you’ve understood the different kinds of data storage, this Drupal guide will demonstrate how to create custom entities and field types and leverage the Database API for lower-level database queries. You’ll also learn how to introduce JavaScript into your module, work with various file systems, and ensure that your code works on multilingual sites. Finally, you’ll work with Views, create automated tests for your functionality, and write secure code. By the end of the book, you’ll have learned how to develop custom modules that can provide solutions to complex business problems, and who knows, maybe you’ll even contribute to the Drupal community!

Who is this book for?

If you are a Drupal developer looking to learn Drupal 9 to write modules for your sites, this book is for you. Drupal site builders and PHP developers with basic object-oriented programming skills will also find this book helpful. Although not necessary, some Symfony experience will help with understanding concepts easily.

What you will learn

  • Develop custom Drupal 9 modules for your applications
  • Master different Drupal 9 subsystems and APIs
  • Model, store, manipulate, and process data for effective data management
  • Display data and content in a clean and secure way using the theme system
  • Test your business logic to prevent regression
  • Stay ahead of the curve and write PHP code by implementing best practices

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Aug 14, 2020
Length: 626 pages
Edition : 3rd
Language : English
ISBN-13 : 9781800204621
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Product Details

Publication date : Aug 14, 2020
Length: 626 pages
Edition : 3rd
Language : English
ISBN-13 : 9781800204621
Languages :
Concepts :
Tools :

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Table of Contents

19 Chapters
Chapter 1: Developing for Drupal 9 Chevron down icon Chevron up icon
Chapter 2: Creating Your First Module Chevron down icon Chevron up icon
Chapter 3: Logging and Mailing Chevron down icon Chevron up icon
Chapter 4: Theming Chevron down icon Chevron up icon
Chapter 5: Menus and Menu Links Chevron down icon Chevron up icon
Chapter 6: Data Modeling and Storage Chevron down icon Chevron up icon
Chapter 7: Your Own Custom Entity and Plugin Types Chevron down icon Chevron up icon
Chapter 8: The Database API Chevron down icon Chevron up icon
Chapter 9: Custom Fields Chevron down icon Chevron up icon
Chapter 10: Access Control Chevron down icon Chevron up icon
Chapter 11: Caching Chevron down icon Chevron up icon
Chapter 12: JavaScript and the Ajax API Chevron down icon Chevron up icon
Chapter 13: Internationalization and Languages Chevron down icon Chevron up icon
Chapter 14: Batches, Queues, and Cron Chevron down icon Chevron up icon
Chapter 15: Views Chevron down icon Chevron up icon
Chapter 16: Working with Files and Images Chevron down icon Chevron up icon
Chapter 17: Automated Testing Chevron down icon Chevron up icon
Chapter 18: Drupal Security Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

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Amazon Customer Jun 25, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is well written and an easy read. A really good introduction and reference work. I was expecting a heavy read, but found it easy going. I'm a novice wanting to explore the subject and found this work ideal.
Amazon Verified review Amazon
Amazon Customer Dec 31, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Very nice set of samples, getting in deepth with Drupal 9
Amazon Verified review Amazon
Hilmar Kári Hallbjörnsson Dec 14, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
When I was preparing for teaching Open-source development class at Reykjavik University, this book was my first choice of teaching. I agree that there are some minor things here and there that I would tweak, the code examples on Github are always "end-of-chapter" solutions, therefor it's sometimes hard for students to find help/assistance from there (more code than they are expecting), but all in all, a very well written book where I could reference chapter/page and the students would understand very clearly.Both for novices and experts alike, this book suits most.
Amazon Verified review Amazon
Jouni Mäkeläinen Jan 04, 2022
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Even though book is namely about module development, it's a quite complete guide to different aspects of Drupal architecture in a easily readable fashion. As such it advances deeper understanding of the CMS platform and is a great addition to the scattered online documentation.
Amazon Verified review Amazon
Oliver Jul 12, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I have been working with Drupal for about 1.5-2.0 years. Clearly you don't want this book as a beginner. However, it can be good even if you don't anticipate actually building modules. The reason is that it provides some solid coverage of how Drupal works; at that is not easily found in many other resources that you will find on the web. I would aim to be at a level where you are comfortable with Drupal 8.8 forward (e.g. 9 or 10 are fine too) in the sense of building a basic website, adding contributed modules and activating modules, and having an awareness of the CSS, JS, HTML, TWIG, presentation layers roles versus the core application code and database. At that point aim to read this book in a 'skim' rather than study fashion so you see how Drupal is working under the hood from an overview of this book. Some of the stuff will be too deep to 'get' on a first read but you will be a whole lot smarter and more comfortable with basic Drupal from having done so. And if you do aim to build modules or even just tweak existing modules close to what you want to make them 'nail it' for your needs, this book should get you there. At that point, think of it as much as a reference volume as a cover to cover read because you will probably have a pretty good idea from the 'skim through' the basic area you need to work with and then just look up the exact syntax guidance relevant to that need.If you are just starting out and aren't a particularly technically experienced person in programming generally, this is probably NOT the book for you. But if you have the basics reasonably under your belt, this will get you to the level where you are probably going to be employable.
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