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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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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Sections
Conventions
Reader feedback
Customer support
Free Chapter
1
Up and Running with Drupal 8
Up and Running with Drupal 8
Introduction
Installing Drupal
Using a distribution with Drupal
Installing modules and themes
Using multisites in Drupal 8
Tools for setting up an environment
Running tests - Simpletest and PHPUnit
2
The Content Authoring Experience
The Content Authoring Experience
Introduction
Configuring the WYSIWYG editor
Adding and editing content
Creating a menu and linking content
Providing inline editing
Creating a custom content type
Applying new Drupal 8 core field types
Customizing the form display of a node
Customizing the display output of a node
3
Displaying Content through Views
Displaying Content through Views
Introduction
Listing content
Editing the default admin interfaces
Creating a block from a View
Utilizing dynamic arguments
Adding a relationship in a View
Providing an Entity Reference result View
4
Extending Drupal
Extending Drupal
Introduction
Creating a module
Defining a custom page
Defining permissions
Providing the configuration on the installation or update
Creating an event subscriber
Using Features 3.0
5
Frontend for the Win
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Frontend for the Win
Introduction
Creating a custom theme based on Classy
Using the new asset management system
Twig templating
Using the Breakpoint module
Using the Responsive Image module
6
Creating Forms with the Form API
Creating Forms with the Form API
Introduction
Creating a form
Using new HTML5 elements
Validating form data
Processing submitted form data
Altering other forms
7
Plug and Play with Plugins
Plug and Play with Plugins
Introduction
Creating blocks using plugins
Creating a custom field type
Creating a custom field widget
Creating a custom field formatter
Creating a custom plugin type
8
Multilingual and Internationalization
Multilingual and Internationalization
Introduction
Translating administrative interfaces
Translating configuration
Translating content
Creating multilingual views
9
Configuration Management - Deploying in Drupal 8
Configuration Management - Deploying in Drupal 8
Introduction
Importing and exporting configurations
Synchronizing site configurations
Using command-line workflow processes
Updating and installing new module configurations
10
The Entity API
The Entity API
Introduction
Creating a configuration entity type
Creating a content entity type
Creating a bundle for a content entity type
Implementing custom access control for an entity
Providing a custom storage handler
Creating a route provider
11
Off the Drupalicon Island
Off the Drupalicon Island
Introduction
Implementing and using a third-party JavaScript library
Implementing and using a third-party CSS library
Implementing and using a third-party PHP library
12
Web Services
Web Services
Introduction
Enabling RESTful interfaces
Using POST to create data
Using PATCH to update data
Using Views to provide custom data sources
Authentication
Using JSON API
13
The Drupal CLI
The Drupal CLI
Introduction
Rebuilding cache in Drupal Console or Drush
Using Drush to interact with the database
Using Drush to manage users
Scaffolding code through Console
Making a Drush command
Making a Console command

Twig templating

Drupal 8's theming layer is complemented by Twig, a component of the Symfony framework. Twig is a template language that uses a syntax similar to Django and Jinja templates. The preceding version of Drupal used PHPTemplate, which required frontend developers to have a rudimentary understanding of PHP.

In this recipe, we will override the Twig template to provide customizations for the email form element. We will use the basic Twig syntax to add a new class and provide a default placeholder.

Getting ready

This recipe assumes that you have already created a custom theme, such as the one you created in the first recipe. When you see mythemein in the following recipe, use the machine name of the theme you created.

Note

At the time of writing this book, the Classy theme does not provide a template suggestion for the email input nor any customization for the input template that differs from Drupal core.

How to do it...

  1. Create a templates folder in your theme's base directory to hold your...

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