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 a calendar day selector using the Datepicker plugin

For all of its great administrative control panels and user interface elements, WordPress still has a simplistic approach to date selection, making users interact with a drop-down box and text fields to indicate the month, day, year, and time when a post or page is to be published. A much more interesting way to enter this type of information is to use a pop-up calendar that allows users to navigate through visual representations of each month and pick the desired date.

This recipe shows how to use the jQuery Datepicker script that is provided by default with WordPress to display a pop-up calendar to provide an easy way to select dates.

Getting ready

You should have access to a WordPress development environment.

How to do it...

  1. Navigate to the WordPress plugin directory of your development installation.
  2. Create a new directory called ch9-calendar-picker along with a subdirectory called css.
  3. Visit, toggle...