Book Image

WordPress Plugin Development Cookbook - Third Edition

By : Yannick Lefebvre
Book Image

WordPress Plugin Development Cookbook - Third Edition

By: Yannick Lefebvre

Overview of this book

WordPress is one of the most widely used, powerful, and open content management systems (CMSs). Whether you're a site owner trying to find the right extension, a developer who wants to contribute to the community, or a website developer working to fulfill a client's needs, learning how to extend WordPress' capabilities will help you to unleash its full potential. This book will help you become familiar with API functions to create secure plugins with easy-to-use administration interfaces. This third edition contains new recipes and up-to-date code samples, including new chapters on creating custom blocks for the block editor and integrating data from external sources. From one chapter to the next, you’ll learn how to create plugins of varying complexity, ranging from a few lines of code to complex extensions that provide intricate new capabilities. You'll start by using the basic mechanisms provided in WordPress to create plugins, followed by recipes covering how to design administration panels, enhance the post editor with custom fields, store custom data, and even create custom blocks. You'll safely incorporate dynamic elements into web pages using scripting languages, learn how to integrate data from external sources, and build new widgets that users will be able to add to WordPress sidebars and widget areas. By the end of this book, you will be able to create WordPress plugins to perform any task you can imagine.
Table of Contents (15 chapters)

Safely loading jQuery onto WordPress web pages

When working on a project that would benefit from the jQuery library, it might be tempting to provide your own copy of jQuery or to access a copy from the Google API website. However, there is no need to do this as WordPress provides a copy of jQuery as part of its installation and makes it very easy to load.

By using the appropriate utility function to load jQuery, developers make a request to WordPress to load this library instead of doing it themselves. Once all the requests have been received, they are analyzed for duplicates. Then, a single instance of each script is loaded to reduce the chance of conflicts between multiple copies of the same library.

Getting ready

You should have access to a WordPress development environment.

How to do it...

Follow these steps to load the jQuery library for use on front-facing website pages:

  1. Navigate to the WordPress plugins directory of your development installation.
  2. Create...