WordPress Plugins allow easy modification, customization, and enhancement to a WordPress blog. Instead of changing the core programming of WordPress, you can add functionality with WordPress Plugins.

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2answers
2k views

How Do I Use jQuery UI In My Plugin

It's a sad day in the world when I Google something and it returns nothing. I am trying to use the default datepicker (or ANY datepicker at this point) and am unable to because of my lack of ...
5
votes
1answer
2k views

Making my plugin multi-site compatible

I want my plugin to be installed on each blog and create database tables per blog. I have this code: register_activation_hook( __FILE__, 'install1' ); function install1() { global $wpdb; if ...
5
votes
2answers
3k views

Using add_theme_support inside a plugin

I've created a custom post type as a plugin and released it into the repository. One of the core features involves using a featured image. I've added thumbnail to $supports in register_post_type(), so ...
5
votes
1answer
962 views

Load js/css files only on specific admin UI pages

How do I adapt this solution to work with my plugin? (Please see the link). I enqueue my css and js script as follows: function my_plugin_init() { wp_enqueue_script('my_plugin_script', ...
5
votes
1answer
476 views

How does Wordpress handle MySQL row lock errors?

If there is a WordPress plugin which updates rows in a custom table, but that update encounters a row lock, what happens? E.g. two users simultaneously fire an update on TABLE1, one setting AGE=1 and ...
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10answers
5k views

Wordpress Plugin Development - Headers Already Sent Message

I'm developing Wordpress plugins. When i activate my plugin, i'm getting a message The plugin generated 293 characters of unexpected output during activation. If you notice “headers already ...
5
votes
2answers
351 views

How would I create a plugin for my shortcodes?

All tutorials I have found say to add your shortcodes to functions.php in your theme. I would like to break that away from my theme and put that in a plugin so I can share these shortcodes between my ...
5
votes
1answer
229 views

Optimize shortcode callbacks

I created a plugin to add some shortcodes in my WordPress site. But I'm a PHP newbie, so I believe it may have some errors or ways to optimize it. It's working fine, and apparently there are no ...
5
votes
2answers
187 views

What is wrong with using add_option with Multisite instead of add_blog_option in a plugin

I'm working on a new plugin but it's my first to save which will save an option to the database. Currently I'm using add_option and I assumed that - activation would fail or - the wrong value would ...
5
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3answers
929 views

How to create a Wordpress plugin for another wordpress plugin?

I always do changes on the Wordpress plugins for clients. But these changes are always in danger to be lost if the plugin is updated. Is there is a way to make a plugin for another plugin in ...
5
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1answer
238 views

How can I find plugins' slug?

I'm wondering how can I find plugins' slug (slug = internal name used by WordPress to do plugin updates and to determine which plugins are currently active)? It is usually plugin's folder name but if ...
5
votes
1answer
140 views

Completely remove WP_Admin_Bar for specific user roles

How do I hide/remove the admin bar that is displayed when a user with specific role is logged in? I figured I have to do something with remove_menu(), but not exactly what and how. Codex
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votes
1answer
119 views

Do plugin files have to follow a specific convention to be “picked up” by WordPress?

I developed a plugin using the normal convention of naming the main plugin file after the plugin folder (i.e. prefix-someplugin for the folder and prefix-someplugin.php for the file). However, I saw ...
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votes
3answers
256 views

Prevent network activation of plugin

I have a plugin that currently doesn't support network activation. The best fix for this of course is to fix it :) which I plan to do. However I wonder if there is a temporary solution I can use to ...
5
votes
2answers
3k views

How to Remove Certain Screen Options and Meta Boxes from add/edit post type?

Now, when you add or edit a particular post within your desired post type, there are more screen options as well. Although, these Screen Options are showing/hiding meta boxes. I would like to be able ...
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votes
3answers
276 views

Releasing new plugin version, how to rename old options keys?

I have everything ready for publishing a new version of my plugin but one last issue stands... The old version had no naming convention for its key option names. The options grew and I renamed all ...
5
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2answers
1k views

How to provide translations for a WordPress TinyMCE plugin?

I know that I can get my translations into JavaScript doing: $MyTranslations = array( 'translation1' => __("Some String 1", "MyTranslations"), 'translation2' => __("Some ...
5
votes
1answer
3k views

whats the difference between term_id and term_taxonomy_id

the title says it all. At the moment in my custom taxonomies I'm getting the terms using the term id and taxonomy name. Thought this question would've been asked before but can't find it anywhere! So ...
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3answers
1k views

Changing Plugin Load Order

I'm writing a plugin, bar, which is dependent on another plugin, foo, being activated, and I need the functions from foo to be available when bar loads. Normally plugins are loaded in alphabetical ...
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2answers
4k views

Quick edit screen customization

Possible Duplicate: How to show custom meta box on "Quick Edit" screen? I'm trying to edit the quick edit screen on my custom post type "visitor" so that I can add some options for my end-users. My ...
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2answers
256 views

Best practice for including plugins as part of a theme?

I'm working on a theme that includes some functionality I've developed as separate plugins (as I'm hoping to release them independently). I'd like to include these plugins as part of the theme core ...
5
votes
1answer
187 views

Using a database view = evil incarnate?

I'm at a point in doing some WordPress plugin development where from what I can tell I either have to create an entirely new plugin or I can create a database view. The client wants some simple logs ...
5
votes
2answers
230 views

Strategies to implement selective loading of plugins

I'm trying to figure out some kind of mechanism to load plugins on demand, depending on the page url, to improve performance. My primary concern is that I have some admin-ajax.php calls that are ...
5
votes
1answer
803 views

Change admin language based on user (in single-site)

I'm trying to make a small plugin to install in some sites of a german client. I can make my way around WordPress in german, but would be easier if it was in english. There's a plugin that manages ...
5
votes
1answer
114 views

What is the etiquette on extending a plug-in

I recently played with a plugin which I liked a lot, but felt it was missing something. So as first stage I went and wrote a tiny plugin (my first), that just added the needed feature - meaning, that ...
5
votes
1answer
767 views

Inserting Taxonomy Terms During a Plugin Activation?

I've been trying various ways of doing this. Basically, I've been trying to make it so that a plugin of mine populates the terms of a taxonomy only once during the plugin's activation. The term ...
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3answers
505 views

WordPress Plugin Development from Scratch. How?

I would like to learn how to create a plugin from scratch, there are tons of tutorials out there on the internet, but they are either premium or not a reliable resource. would like to know which are ...
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3answers
1k views

Query Posts by Custom Field 'Price'

I'd like to display all posts within a given price range. For example: When a user inputs 100 and 1000 (in two separate form fields) - my site will display all posts that have a custom field called ...
5
votes
1answer
470 views

How do you create an archive for a custom post type from a plugin?

So I'm creating a plugin to create buildings that list condos for sale. The simplest way to do this was to just create a custom post type for the buildings and then the listings but I'm now stuck on ...
5
votes
1answer
111 views

Listen to Post action

I am writing a plugin that adds a custom metabox to the post page. I would like to trigger an event when the user navigates away from the edit post page or when a user stops editing a specific post. ...
5
votes
2answers
158 views

What is the difference between using global $current_screen and get_current_screen()?

I have been looking at get_current_screen();. I have seen there is also a global $current_screen; that I could use. Here are two examples: // Using function function wpse_post_notice() { ...
5
votes
1answer
261 views

Uninstall script for a plugin in Multisite

I've just realized that the traditional uninstall.php file along a plugin is not working in Multisite. if ( !defined( 'WP_UNINSTALL_PLUGIN' ) ) exit(); delete_option( 'plugin_option_name' ); ...
5
votes
2answers
317 views

Passing current cookies in wp_remote_get to get Draft Post Preview

I want pass current user cookies in wp_remote_get function to get a Draft Post Preview page content. I check already the questions: What URL do you pass to wp_remote_get to load the body of the ...
5
votes
1answer
423 views

Wordpress URL Rewrite not working

I'm trying to create a custom url rewrite for my wordpress plugin. function insert_plugin_rewrite_rule($rules) { global $wp, $wp_rewrite; $wp->add_query_var('update_slug'); $ret = ...
5
votes
2answers
2k views

How to store username and password to API in wordpress option DB?

I'm currently developing a plugin and the chances are that I will more than likely release it on the public plugin repository so others can use it. The plugin will be using an API and to use this API ...
5
votes
3answers
3k views

Passing arguments to a admin menu page callback?

Situation: I'm working on a plugin and I'm developing it as a class, everything worked fine until I run into this situation. I wanted to make things a bit cleaner and tried this.. class MyPlugin { ...
5
votes
3answers
655 views

Plugin directory “Last Updated” not changed after initial commit?

I released the first version of my Rewrite analyzer plugin with a commit on 2010-05-12. The WordPress.org plugin directory however still displays 2010-11-27 as the "Last Updated" date - this is the ...
5
votes
1answer
1k views

How to add sub-menu to a menu generated by wp_nav_menu by using plugin

I have a menu generated by wp_nav_menu which look like <ul class="nav-menu" id="menu-top-nav"> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-43" ...
4
votes
3answers
5k views

add_action hook for completely new post?

publish_post Runs when a post is published, or if it is edited and its status is "published". Action function arguments: post ID. -Plugin API Documentation I've added the publish_post ...
4
votes
1answer
3k views

How to make a WordPress plugin translation ready?

What is the best way create a plugin that is translation ready? It doesn't have to be translated from the beginning but it has to be easily translatable so fellow developers from different cultures ...
4
votes
5answers
2k views

is_plugin_active function doesn't exist

I'm using WordPress 3.0.5 and have tested with 3.1rc4. In the main PHP file of my plugin, when I try to call is_plugin_active I get Call to undefined function is_plugin_active(). I can call add_action ...
4
votes
4answers
830 views

dealing with large HTML output via plugin code

I recently wrote my first WP plugin that adds a shortcode for embedding a custom jquery image gallery into posts. It's primarily just dumps a good chunk of HTML into the post, along with javascript ...
4
votes
3answers
3k views

Which hook should be used to add an action containing a redirect?

I want to build a plugin that grabs certain url params from the query string to build a new query string for the same page. I'm following the excellent the Professional WordPress Plugin Development ...
4
votes
1answer
179 views

Why does WordPress add 0 (zero) to an Ajax response?

Unless I end Ajax processing function by exit() or die(), the Ajax function receives desired and correct output but following by 0. Any idea why is that happening? Is that meant to be like that or ...
4
votes
3answers
8k views

Get page content using slug

I'm trying to get page content when I only know the slug string. Is there a function for this, or an easy way to do this or is this a case of doing it via SQL? Thanks very much
4
votes
2answers
948 views

WP 3.3 Tooltips API?

Does anyone have a tutorial on how to implement the new Tooltips API into a theme or plugin? I'm eager to tap into this to help first time users of my theme and plugins. From mashable'e excellent ...
4
votes
4answers
340 views

Where is it better to start learning how to develop for Wordpress?

I have already read this question and answer to it ( Where do I start from ). So I have slightly different question. If I basicaly have no knowledge of how the WordPress code is structured and I have ...
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2answers
162 views

Where do I start from

I'm student web developer and I'd like to know the things I should know before venturing into WordPress. Where do I start?
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2answers
945 views

Where can I find a schema of wordpress plugin core architecture?

There are plenty of articles which explain how to create a wordpress plugin. I'm not looking for that, I'm looking for a schema of the core architecture of a wordpress plugin (an UML class diagram and ...
4
votes
1answer
1k views

How can I add columns to the post edit listing to show my custom post data?

When you click on "Posts" or "Pages", you get a paged listing of your posts or pages with the following columns: Title | Author | Categories | Tags | Date I have a plugin which gives an SEO score ...