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Index
WordPress Plugin Development
Table of Contents
WordPress Plugin Development
Credits
About the Author
About the Reviewer
Preface
What This Book Covers
Who is This Book For
Conventions
Reader Feedback
Customer Support
Downloading the Example Code for the Book
Errata
Piracy
Questions
1. Preparing for WordPress Development
How will you benefit?
WordPress features
More sites means more opportunities
Big players use it
Urgent response to security issues
Flexibility
Search engines friendly
Easy to use
Social aspect
Plugins as tool for promotion
Dogfooding WordPress plugins
Challenges involved
Development
Security
Work after development
Localization
Documentation
Support
Promotion
Plugins developed in this book
Digg This
Live Blogroll
The Wall
Snazzy Archives
Insights
Post Types
Development Goodies
Tools for the job
WordPress
Text editor
FTP client
Web browser
Firebug
Ubiquity
Screengrab
IE tab
Final notes
Installing and managing plugins
Searching documentation
Summary
2. Social Bookmarking
Plugging in your first plugin
Time for action — Create your first plugin
What just happened?
The plugin information header
Checking WordPress versions
Checking the plugin
Time for action — Testing the version check
What just happened?
Have a go Hero
Displaying a Digg button
Time for action — Implement a Digg link
What just happened?
Using the Digg API
Submit URL:
Submit URL Details:
Acquiring post information
Post permalink URL
Editing the theme files
Have a go Hero
WordPress plugin hooks
Time for action — Use a filter hook
What just happened?
WordPress hooks
Filter hooks
Action hooks
Practical filters and actions examples
Upper case titles
Mailing list
Changing core WordPress functionality
Have a go Hero
Adding a Digg button using JavaScript code
Time for action — Implement a Digg button
What just happened?
Conditional Tags
Styling the output
Time for action — Use CSS to position the button
What just happened?
Have a go Hero
Summary
3. Live Blogroll
Starting up with the blogroll
Time for action — Roll into the blogroll
What just happened?
RSS Feed Processing
jQuery JavaScript library
Implementing a mouse hover event in jQuery
Time for action — Creating a hover event with jQuery
What just happened?
JavaScript and WordPress
Initializing jQuery
Expanding jQuery knowledge
Creating the pop-up with CSS
Time for action — Apply CSS to the popup
What just happened?
Demystifying Ajax
Simple example of using Ajax
Time for action — Use Ajax to dynamically retrieve feed posts
What just happened?
Using JavaScript with WordPress
Parsing parameters using wp_localize_script
Ajax and WordPress
Ajax in admin panel
jQuery.ajax method
Time for action — Use advanced Ajax call
What just happened?
Ajax script security using nonces
Time for action — Add a security nonce
What just happened?
Summary
4. The Wall
The main concepts behind the Wall plugin
Creating a widget
Time for action — Create a 'Hello World!' widget
What just happened?
Register widgets with description
Widget controls
Time for action — Expanding the widget with controls
What just happened?
WordPress options
Display widget control
Handling widget input
Handling widget output
Create a WordPress page from the code
Time for action — Insert a page
What just happened?
Handling user input
Time for action — Create the wall comment form
What just happened?
Managing Ajax comment submit
Time for action — Save the comments
What just happened?
Using Ajax to submit forms
Saving comments in WordPress post
Dynamically load comments
Time for action — Display the comments
What just happened?
WordPress database query
Comment output
Displaying the comments
Ajax security
Time for action — Display the comments
What just happened?
Have a go Hero
Summary
5. Snazzy Archives
Using a class for plugin
Time for action — Create a new plugin class
What just happened?
Showing template output with shortcodes
Time for action — Use a shortcode
What just happened?
Shortcode API
Enclosing shortcodes
Custom templates
Time for action — Create a custom template
What just happened?
Prepare archives
Time for action — Show archives of posts
What just happened?
Get all posts from database
Using a regular expression
Retrieve comment count for a post
Using output buffers
Apply styling and jQuery to archives
Time for action — Style the archive view
What just happened?
Time for action Use jQuery to allow user interaction
What just happened?
Have a go Hero
Creating plugin options page
Time for action Create an options page
What just happened?
Managing plugin options
Handling options form
Adding administration pages
Use plugin options
Time for action — Apply the plugin options
What just happened?
Caching the plugin output
Time for action — Create archives cache
What just happened?
Have a go Hero
Summary
6. Insights for WordPress
Creating custom panels in the editor screen
Time for action — Create a new plugin outline
What just happened?
Custom edit panels in WordPress
Searching the posts
Time for action — Display a list of matching posts
What just happened?
Interacting with tinyMCE
Time for action — Insert the link into tinyMCE
What just happened?
Using Flickr API
Time for action — Display Flickr photos
What just happened?
Using third-party solutions—phpFlickr
Creating a tinyMCE plugin
Time for action — Adding a button to tinyMCE
What just happened?
Create a functional tinyMCE plugin window
Time for action — Open a tinyMCE window
What just happened?
Have a go hero
Summary
7. Post Types
Handling localization
Time for action — Create plugin and add localization
What just happened?
Optimizing localization usage
How does localization work?
Adding a post template
Time for action — Create 'add photo' post template
What just happened?
Backend CSS classes
Handling file and image uploads
Time for action — Handle uploaded image
What just happened?
Using custom fields
Adding custom fields
Retrieving custom fields
Quick post a link
Time for action — Add link template
What just happened?
Tinkering with WordPress backend menus
Time for action — Remove 'Link' from the Write page
What just happened?
Programming the Manage panel
Time for action — Add post type column in the Manage panel
What just happened?
Modifying an existing column
Manage screen search filter
Time for action — Add a search filter box
What just happened?
Handling error messages
Time for action — Adding support for errors
What just happened?
User roles and capabilities
Time for action Add user capability checks
What just happened?
Have a go Hero
Summary
8. Development Goodies
Creating Localization files
Time for action — Create a POT file
What just happened?
Updating POT file
Time for action — Perform translation
What just happened?
Updating translation
Documentation and support
Plugin readme file
Time for action — Create a sample plugin readme.txt file
What just happened?
Sections of readme.txt
General information
Special codes
Screenshots
Installation instructions
Plugin homepage
Providing support
Code management and plugin repository
Requesting repository access
Using SVN
Time for action — Manage a local repository using SVN
What just happened?
Tagging a new version
Using WordPress development SVN
Local copy of plugin repository
Promotion
Plugin promotion checklist
General plugin development guidelines
Security
Performance
Re-using resources
Keeping API up-to-date
WordPress MU development
WordPress and GPL
Online resources
WordPress documentation (WordPress Codex)
WordPress development news
WordPress blog
WordPress development updates
WordPress Trac
WordPress dev IRC channel
Debugging and testing
Unit testing
Automated tests
Mailing Lists
WP hackers
WP professionals
Other mailing lists
Podcasts
WordCast
WordPress Weekly
Author's (Vladimir Prelovac's) web site
Summary
Index
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