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)

Displaying a pop-up dialog using the built-in ThickBox plugin

As annoying as they can be to visitors, pop-up dialogs are a feature that many website administrators use to help them advertise special offers or get readers to subscribe to their content. Since it uses pop-up dialogs in its own administrative pages, WordPress comes bundled with a jQuery script called ThickBox that can be used to display these types of dialogs.

Getting ready

You should have access to a WordPress development environment.

How to do it...

Follow these steps to load the ThickBox script and use it to render a pop-up dialog:

  1. Navigate to the WordPress plugins directory of your development installation.
  2. Create a new directory called ch9-pop-up-dialog.
  3. Navigate to the directory and create a text file called ch9-pop-up-dialog.php.
  4. Open the new file in a code editor and add an appropriate header at the top of the plugin file, naming the plugin Chapter 9 - Pop-Up Dialog.
  5. Add the...