Book Image

WordPress Plugin Development Cookbook

By : Yannick Lefebvre
Book Image

WordPress Plugin Development Cookbook

By: Yannick Lefebvre

Overview of this book

<p>WordPress is a popular, powerful, and open Content Management System. Learning to extend its core capabilities allows you to unleash its full potential, whether you're an administrator who cannot find the right extension, or a developer with a great idea to enhance the platform for the community, or a website designer/developer working to fulfill a client's needs. "WordPress Plugin Development Cookbook" is the perfect companion for plugin developers, offering easy-to-follow instructions to accomplish tasks that range from basic plugin creation and configuration to advanced customization techniques. Each topic is illustrated through realistic examples showing how it can be applied to solve common problems, followed by explanations of all concepts used. Create WordPress plugins of varying complexity, from a few lines that change a specific function to complex extensions that provide intricate new capabilities. From the creation of your first simple plugin to adding entire new sections and widgets in the administration interface, learn how to change and extend WordPress to perform virtually any task. After installing and configuring an efficient plugin development environment, you will discover how to register your own callbacks that WordPress will execute at key points, forming the basis of plugin creation. Armed with this essential knowledge, you'll explore how to create administration pages to allow users to configure your new creations and to add new content management sections to WordPress through custom post types and custom database tables. Once you have all these elements in place, improve your plugins by customizing the post and page editors, creating user-facing forms to populate new content sections, making your plugin output dynamic using Javascript and AJAX as well as adding new widgets to the platform. Finally, see how to add support for multiple languages and distribute your work to the global WordPress community. "WordPress Plugin Development Cookbook" provides you with tools to create any plugin you can imagine. &nbsp;</p>

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WordPress Plugin Development Cookbook
Yannick Lefebvre
Jul, 2012 | 318 pages
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Table of Contents (17 chapters)
WordPress Plugin Development Cookbook
WordPress Plugin Development Cookbook
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Preparing a Local Development Environment
Preparing a Local Development Environment
Introduction
Installing a web server on your computer
Downloading and configuring a local WordPress installation
Creating a local Subversion repository
Importing initial files to a local Subversion repository
Checking out files from a Subversion repository
Committing changes to a Subversion repository
Reverting uncommitted file changes
Viewing file history and reverting content changes to older revisions
Installing a dedicated code/text editor
Installing and configuring the NetBeans Integrated Development Environment
Interacting with a Subversion repository from the NetBeans interface
Managing a MySQL database server from the NetBeans interface
2
Plugin Framework Basics
Plugin Framework Basics
Introduction
Creating a plugin file and header
Adding output content to page headers using plugin actions
Using WordPress path utility functions to load external files and images
Modifying the page title using plugin filters
Adding text after each item's content using plugin filters
Inserting link statistics tracking code in page body using plugin filters
Troubleshooting coding errors and printing variable content
Creating a new simple shortcode
Creating a new shortcode with parameters
Creating a new enclosing shortcode
Loading a stylesheet to format plugin output
Writing plugins using object-oriented PHP
3
User Settings and Administration Pages
User Settings and Administration Pages
Introduction
Creating default user settings on plugin initialization
Storing user settings using arrays
Removing plugin data on deletion
Creating an administration page menu item in the Settings menu
Creating a multi-level administration menu
Hiding items which users should not access from the default menu
Rendering the admin page contents using HTML
Processing and storing plugin configuration data
Displaying a confirmation message when options are saved
Adding custom help pages
Rendering the admin page contents using the Settings API
Accessing user settings from action and filter hooks
Formatting admin pages using meta boxes
Splitting admin code from the main plugin file to optimize site performance
Storing stylesheet data in user settings
4
The Power of Custom Post Types
The Power of Custom Post Types
Introduction
Creating a custom post type
Adding a new section to the custom post type editor
Displaying single custom post type items using custom templates
Creating an archive page for custom post types
Displaying custom post type data in shortcodes
Adding custom categories for custom post types
Hiding the category editor from the custom post type editor
Displaying additional columns in the custom post list page
Adding filters for custom categories to the custom post list page
Updating page title to include custom post data using plugin filters
5
Customizing Post and Page Editors
Customizing Post and Page Editors
Introduction
Adding extra fields to the post editor using custom meta boxes
Displaying custom post data in theme templates
Hiding the Custom Field section in the post editor
Extending the post editor to allow users to upload files directly
6
Accepting User Content Submissions
Accepting User Content Submissions
Introduction
Creating a client-side content submission form
Saving user-submitted content in custom post types
Sending e-mail notifications upon new submissions
Implementing a captcha on user forms
7
Creating Custom MySQL Database Tables
Creating Custom MySQL Database Tables
Introduction
Creating new database tables
Deleting custom tables on plugin removal
Updating custom table structure on plugin upgrade
Displaying custom table data in an admin page
Inserting and updating records in custom tables
Deleting records from custom tables
Displaying custom database table data in shortcodes
Implementing a search function to retrieve custom table data
Importing data from a user file into custom tables
8
Leveraging JavaScript, jQuery, and AJAX Scripts
Leveraging JavaScript, jQuery, and AJAX Scripts
Introduction
Safely loading jQuery onto WordPress web pages
Displaying a pop-up dialog using the built-in ThickBox plugin
Controlling pop-up dialog display using shortcodes
Displaying a calendar day selector using the Datepicker plugin
Adding tooltips to admin page form fields using the TipTip plugin
Using AJAX to dynamically update partial page contents
9
Adding New Widgets to the WordPress Library
Adding New Widgets to the WordPress Library
Introduction
Creating a new widget in WordPress
Displaying configuration options
Validating configuration options
Implementing the widget display function
Adding a custom dashboard widget
10
Enabling Plugin Internationalization
Enabling Plugin Internationalization
Introduction
Changing the WordPress language configuration
Adapting default user settings for translation
Making admin page code ready for translation
Modifying shortcode output for translation
Translating text strings using Poedit
Loading a language file in the plugin initialization
11
Distributing Your Plugin on wordpress.org
Distributing Your Plugin on wordpress.org
Introduction
Creating a readme file for your plugin
Applying for your plugin to be hosted on wordpress.org
Uploading your plugin using Subversion
Providing a plugin banner image

Making admin page code ready for translation

While the previous recipe showed how to look up the translation of a text item and return its value for further processing in the plugin code, there are many instances where it is more practical to display the translated content immediately.

This recipe shows how to translate the contents of a simple administration page for immediate display.

Getting ready

You should have already followed the Adapting default user settings for translation recipe to have a starting point for this recipe. Alternatively, you can get the resulting code for that recipe from the code bundle. You should rename the file ch10-hello-world\ch10-hello-world-v1.php to ch10-hello-world.php before starting.

How to do it...

  1. 1. Navigate to the ch10-hello-world folder of the WordPress plugin directory of your development installation.

  2. 2. Open the ch10-hello-world.php file in a text editor.

  3. 3. Add the following line of code at the end of the file to register a function to be called when...

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