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

Displaying custom post type data in shortcodes

To help visitors navigate through the items added using our new custom post type, we will need to display a list of all the book reviews on the site, along with navigation elements to be able to handle large numbers of items. While WordPress offers a built-in mechanism to list post items in the form of the archive page, it is not easy for a plugin to be able to modify the layout of the resulting page in a consistent way across all possible user themes. A better solution to display a list of custom post type items is to create a shortcode that will display one or more posts in any place selected by the user, including a page, a post, or even on the site's front page.

This recipe shows how to create a shortcode that will retrieve and display five book reviews at a time with accompanying navigation links.

Getting ready

You should have already followed the Displaying single custom post type items using a custom layout recipe to have a starting point...