Book Image

WordPress Plugin Development Cookbook - Second Edition

By : Yannick Lefebvre
Book Image

WordPress Plugin Development Cookbook - Second Edition

By: Yannick Lefebvre

Overview of this book

WordPress is a popular, powerful, and open Content Management System. Learning how to extend its capabilities allows you to unleash its full potential, whether you're an administrator trying to find the right extension, a developer with a great idea to enhance the platform for the community, or a website developer working to fulfill a client's needs. This book shows readers how to navigate WordPress' vast set of API functions to create high-quality plugins with easy-to-configure administration interfaces. With new recipes and materials updated for the latest versions of WordPress 4.x, this second edition teaches you 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 and execute custom user code. You will then see how to design administration panels, enhance the post editor with custom fields, store custom data, and modify site behavior based on the value of custom fields. You'll safely incorporate dynamic elements on web pages using scripting languages, 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 (20 chapters)
Title Page
About the Author
About the Reviewers
Customer Feedback

Controlling pop-up dialog display using shortcodes

As you may be aware, loading scripts and styles on a page where they won't be used unnecessarily slows down that page's rendering time, since the browser will still need to download and validate the content of these external files. While the previous recipe's There's More... section offered one way to select specific pages where scripts and styles should be loaded, a different approach is to analyze the page contents for the presence of a special code to make that decision.

This recipe shows how to add a filter to the previous recipe to search for a shortcode in posts and pages to decide when to display a pop-up dialog.

Getting ready

You should have already followed the Displaying a pop-up dialog using the built-in ThickBox plugin recipe to have a starting point for this recipe. Alternatively, you can get the resulting code (Chapter 9/ch9-pop-up-dialog/ch9-pop-up-dialog-v1.php) from the code bundle and rename the file as ch9-pop-up-dialog.php...