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WordPress Plugin Development Cookbook - Third Edition

Name: WordPress Plugin Development Cookbook - Third Edition
Author: Yannick Lefebvre
ISBN: 9781801810777

by Yannick Lefebvre

March 2022

Intermediate to advanced

420 pages

8h 21m

English

Packt Publishing

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WordPress Plugin Development Cookbook
Third EditionContributorsAbout the authorAbout the reviewers
Preface
Who this book is forWhat this book coversTo get the most out of this bookDownload the example code filesDownload the color imagesConventions usedSectionsGetting readyHow to do it…How it works…There's more…See alsoGet in touchShare Your Thoughts
Chapter 1: Preparing a Local Development Environment
Technical requirementsInstalling a local web server on your computerHow to do it…How it works…There's more…Creating a local version control repository How to do it…How it works…There's more…Installing a dedicated code editor/text editorGetting readyHow to do it…How it works…There's more…
Chapter 2: Plugin Framework Basics
Technical requirements Creating a plugin file and headerGetting readyHow to do it...How it works...See alsoAdding output content to page headers using plugin actionsHow to do it...How it works...There's more...See alsoUsing WordPress path utility functions to load external files and imagesHow to do it...How it works...There's more...See alsoModifying the site generator meta tag using plugin filtersHow to do it...How it works...There's more...See alsoAdding text after each item's content using plugin filtersHow to do it...How it works...There's more...See alsoInserting link tracking code in the page body using plugin filtersGetting readyHow to do it...How it works...See alsoTroubleshooting coding errors and printing variable contentHow to do it...How it works...There's more...See alsoCreating a new simple shortcodeHow to do it...How it works...See alsoCreating a new shortcode with parametersHow to do it...How it works...See alsoCreating a new enclosing shortcodeHow to do it...How it works...See alsoLoading a style sheet to format plugin outputGetting readyHow to do it...How it works...See alsoWriting plugins using object-oriented PHPGetting readyHow to do it...How it works...There's more…See also
Chapter 3: User Settings and Administration Pages
Technical requirementsCreating default user settings on plugin initializationHow to do it...How it works...There's more...See alsoStoring user settings using arraysGetting readyHow to do it...How it works...See alsoRemoving plugin data on deletionGetting readyHow to do it...How it works...See alsoCreating an administration page menu item in the settings menuGetting readyHow to do it...How it works...There's more...See alsoCreating a multi-level administration menuHow to do it...How it works...There's more…See alsoRendering the admin page contents using HTMLGetting readyHow to do it...How it works...There's more...See alsoProcessing and storing plugin configuration dataGetting readyHow to do it...How it works...See alsoDisplaying a confirmation message when options are savedGetting readyHow to do it...How it works...See alsoAdding custom help pagesGetting readyHow to do it...How it works...See alsoRendering the admin page contents using the Settings APIHow to do it...How it works...There's more...See alsoAccessing user settings from action and filter hooksGetting readyHow to do it...How it works...See alsoFormatting admin pages using meta boxesGetting readyHow to do it...How it works...See alsoSplitting admin code from the main plugin file to optimize site performanceGetting readyHow to do it...How it works...See alsoStoring style sheet data in user settingsGetting readyHow to do it...How it works...See alsoManaging multiple sets of user settings from a single admin pageGetting readyHow to do it...How it works...See alsoCreating a network-level plugin with admin pagesGetting readyHow to do it...How it works...See also
Chapter 4: The Power of Custom Post Types
Technical requirements Creating a custom post typeGetting readyHow to do it...How it works...There's more...See alsoAdding a new section to the custom post type editorGetting readyHow to do it...How it works...See alsoDisplaying single custom post type items using a custom layoutGetting readyHow to do it...How it works...See alsoTailoring search output for custom post type itemsGetting readyHow to do it…How it works…See alsoDisplaying custom post type data in shortcodesGetting readyHow to do it...How it works...See alsoAdding custom categories for custom post typesGetting readyHow to do it...How it works...See alsoAdding custom fields to categoriesGetting readyHow to do it...How it works...See alsoHiding the category editor from the custom post type editorGetting readyHow to do it...How it works...See alsoDisplaying additional columns in the custom post list pageGetting readyHow to do it...How it works...See alsoAdding filters for custom categories to the custom post list pageGetting readyHow to do it...How it works...See alsoAdding Quick Edit fields for custom categoriesGetting readyHow to do it...How it works...Updating the page title to include custom post data using plugin filtersGetting readyHow to do it...How it works...
Chapter 5: Customizing Post and Page Editors
Technical requirements Capturing and displaying information using custom meta boxesGetting readyHow to do it...How it works...There's more...Displaying custom post data using filter functionsGetting readyHow to do it...How it works...See alsoHiding the Custom Fields section in the post editorGetting readyHow to do it...How it works...Extending the post editor to attach custom files with the media uploaderGetting readyHow to do it...How it works...See also
Chapter 6: Extending the Block Editor
Technical requirements Setting up a block development environment and creating a simple blockGetting readyHow to do it...How it works...There's more...See alsoCreating an editable blockquote blockGetting readyHow to do it...How it works...See alsoCreating a new WordPress REST endpointGetting readyHow to do it...How it works...See alsoCreating a server-side rendering block that leverages an existing shortcodeGetting readyHow to do it...How it works...See also
Chapter 7: Accepting User Content Submissions
Technical requirements Creating a client-side content submission formGetting readyHow to do it...How it works...See alsoSaving user-submitted content in custom post typesGetting readyHow to do it...How it works...There's more...See alsoSending email notifications upon new submissionsGetting readyHow to do it...How it works...See alsoImplementing a CAPTCHA on user forms using an online serviceGetting readyHow to do it...How it works...See alsoUsing a local library to implement a CAPTCHA on user formsGetting readyHow to do it...How it works...See also
Chapter 8: Customizing User Data
Technical requirements Adding custom fields to the user editorGetting readyHow to do it...How it works...See alsoProcessing and storing custom user dataGetting readyHow to do it...How it works...See alsoDisplaying new user data on the user list pageGetting readyHow to do it...How it works...See alsoUsing custom user data in an enclosing shortcodeGetting readyHow to do it...How it works...See also

Chapter 9: Leveraging JavaScript, jQuery, and AJAX Scripts
Technical requirements Safely loading jQuery onto WordPress web pagesGetting readyHow to do it...How it works...There's more...Displaying a pop-up dialog using the built-in ThickBox pluginGetting readyHow to do it...How it works...There's more...Controlling pop-up dialog display using shortcodesGetting readyHow to do it...How it works...See alsoDisplaying a calendar day selector using the Datepicker pluginGetting readyHow to do it...How it works...Adding tooltips to admin page form fields using the TipTip pluginGetting readyHow to do it...How it works...See alsoUsing AJAX to dynamically update partial page contentsGetting readyHow to do it...How it works...See also
Chapter 10: Adding New Widgets to the WordPress Library
Technical requirements Creating a new widget in WordPressGetting readyHow to do it...How it works...See alsoDisplaying widget configuration optionsGetting readyHow to do it...How it works...See alsoValidating widget configuration optionsGetting readyHow to do it...How it works...See alsoAdding a custom dashboard widgetGetting readyHow to do it...How it works...See alsoAdding a custom widget to the network dashboardGetting readyHow to do it...How it works...See also
Chapter 11: Fetching, Caching, and Regularly Updating External Site Data
Technical requirements Displaying RSS items from an external feedGetting readyHow to do it…How it works...There's more…See alsoOptimizing plugin performance by storing external data using transientsGetting readyHow to do it...How it works...See alsoScheduling plugin data updates using WP-CronGetting readyHow to do it...There's more…See also
Chapter 12: Enabling Plugin Internationalization
Technical requirements Changing the WordPress site language configurationGetting readyHow to do it...How it works...Adapting default user settings for translationGetting readyHow to do it...How it works...See alsoMaking admin page code ready for translationGetting readyHow to do it...How it works...See alsoModifying shortcode output for translationGetting readyHow to do it...How it works...See alsoTranslating text strings using PoeditGetting readyHow to do it...How it works...There's more...See alsoLoading a language file in the plugin initializationGetting readyHow to do it...How it works...There's more...See also
Chapter 13: Distributing Your Plugin on WordPress.org
Technical requirements Creating a README file for your pluginGetting readyHow to do it...How it works...There's more...Applying for your plugin to be hosted on WordPress.orgHow to do it...How it works...See alsoUploading your plugin using SubversionGetting readyHow to do it...How it works...There's more...See alsoProviding plugin banner and thumbnail imagesGetting readyHow to do it...How it works...See also
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Content preview from WordPress Plugin Development Cookbook - Third Edition

Chapter 11: Fetching, Caching, and Regularly Updating External Site Data

After spending most of our time learning how to extend WordPress to allow site administrators and users to create local content, this chapter focuses on interacting with external data sources. While we did some work with displaying Twitter feed content in the Creating a new shortcode with parameters recipe in Chapter 2, Plugin Framework Basics, we had very little control over how this data was displayed since the content was shown in an IFrame. We also had no control over how this data was fetched and no way to cache it. The reason for this is that every user loading a page containing the Twitter feed shortcode fetched their own copy of the information to be displayed. ...

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WordPress Plugin Development Cookbook - Second Edition

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WordPress Plugin Development Cookbook - Third Edition

by Yannick Lefebvre

Chapter 11: Fetching, Caching, and Regularly Updating External Site Data

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