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Questions tagged [actions]

A name for an event that is executed at specific points throughout the WordPress core.

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58
votes
7answers
41k views

remove_action or remove_filter with external classes?

In a situation where a plugin has encapsulated its methods within a class and then registered a filter or action against one of those methods, how do you remove the action or the filter if you no ...
52
votes
8answers
33k views

Passing a parameter to filter and action functions

Is a way to pass my own parameters to the function in add_filter or add_action. For example take a look in the following code: function my_content($content, $my_param) { do something... using $...
51
votes
3answers
28k views

Difference Between Filter and Action Hooks?

I have been looking at the plugin API a bit more in depth recently and I was wondering what real differences there were between action and filter hooks. They both are events that receive data as a ...
37
votes
7answers
59k views

add_action reference a class

Is it possible to reference a class instead of a function in 'add_action'? Can't seem to figure it out. Here is just a basic example of the function in question. add_action( 'admin_init', 'MyClass' );...
32
votes
5answers
33k views

How to know what functions are hooked to an action/filter?

Is there a way to know what functions are hooked to a particular hook? For example if I'd like to know what functions are hooked to the wp_head hook.
31
votes
1answer
13k views

Why does save_post action fire when creating a new post?

I'm surprised by the fact that my function that I've tacked onto the save_post action fires when I click the "New Post" link in the Admin Dashboard. Note - this is before I've pressed Save or Update, ...
28
votes
1answer
26k views

Get a list of all registered actions

I'm trying to debug a plugin which I didn't develop and I want to list all the registered actions. I've read this SO thread: WordPress: How do I get all the registered functions for 'the_content' ...
28
votes
1answer
17k views

How to test wp_cron?

This is kind of a stupid question... I scheduled a action to run every hour: if(!wp_next_scheduled('my_hourly_events')) wp_schedule_event(time(), 'hourly', 'my_hourly_events'); add_action('...
27
votes
2answers
36k views

Is there a hook that runs after a user logs in?

I am writing a plugin that fetches some extended user info from a remote service and I need it to execute its function each time a user logs in. Is there a hook that gets fired after login that I can ...
26
votes
1answer
18k views

how to limit search to post titles?

Is there a way to limit search to post titles? I know I can modify query.php core file but there must be a way to do it with hooks right? Thanks in advance!
23
votes
3answers
23k views

How to enqueue scripts on custom post add/edit pages?

I'm trying to enqueue a JS script only when someone is adding or editing a custom post type I created called "recipes". Currently the script works ok when I do this: if (is_admin()){ ...
20
votes
1answer
2k views

How to create an API for my plugin?

I have been developing plugins for WordPress, most plugins I have developed use two or three classes, hence not as huge as Buddypress or WooCommerce. I am planning to develop two open source plugins ...
20
votes
4answers
33k views

Difference between do_action and add_action

This question might be wrong, I am not sure about it. Because I am not clear on this. I know add_action it is used to to hook our function to the specified function. For example add_action('wp_head'.'...
19
votes
2answers
24k views

Trouble understanding apply_filters()

In apply_filters() apply_filters( $tag, $value, $var ... ); I'm having trouble wrapping my head around the $value and $var. I read the codex and it sounds like the $value can be modified, $var not, ...
19
votes
5answers
34k views

How can I edit post data before it is saved?

I have a plugin and I would like to be able to run the post content through some filters before it is saved to the database. From looking at the plugin api, I see that two hooks that look like they ...
18
votes
2answers
45k views

what is correct way to hook when update post

i try to hook when post is updated but all hook i try never executed except updated_post_meta add_action('updated_post_meta', 'my_function'); function my_function($post_id) { echo 'This is ...
18
votes
1answer
20k views

How to override existing plugin action with new action

I'm using a plugin. It has an action like this. add_action('publish_post', 'old_action'); function old_action($pid) { "code goes here" } } I'm writing a module for this plugin. So i need to ...
17
votes
3answers
14k views

remove_action on after_setup_theme not working from child theme

I am trying to remove a theme action for an elegant-themes theme using a child theme.. This works when I remove action after add_action code anywhere in the parent theme functions.php. However, it ...
16
votes
1answer
17k views

How can I see all the actions attached to an “add_action” hook?

I'm working with the admin bar and trying to debug some of the menus and their priorities. I know several callbacks get bound to actions, such as this one: add_action( 'admin_bar_menu', '...
16
votes
3answers
7k views

add_action(), add_filter() before or after function

When looking through WordPress snippets/tutorials/plugins I often see add_action() and add_filter() being placed before the function is declared: add_action( 'publish_post', 'email_friends' ); ...
16
votes
1answer
1k views

Is there a action hook for the “Empty Trash” button?

I would like to run a function when the user clicks the "Empty Trash" button for posts. Something like: add_action('empty_trash','myFunction'); function myFunction(){ // My code }
16
votes
2answers
8k views

Why do some hooks not work inside class context?

I'm pretty stumped on this one. I'm using add_action inside my plugin class to do certain things- add scripts & styles to the head, wp_ajax, etc. Here's the actions, in the __construct: function ...
15
votes
3answers
14k 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 ...
14
votes
3answers
3k views

get_template_part vs action hooks in themes

It seems to me both of these afford the opportunity for the end user to modify a theme without actually editing the themes files (via child themes). My question is, is one method preferred over the ...
13
votes
3answers
27k views

remove custom post type permalink

I've registered post type with following -- $holidayLabels = array( 'name' => __( 'Holidays'), 'singular_name' => __( 'Holidays'), 'all_items' => __( 'All Holidays'), '...
13
votes
3answers
21k views

What is the very earliest action hook you can call?

After the solution to this question was to get a function to launch BEFORE the init action is fired by taking the sequence out of its function, it got me thinking, is there any earlier in the WP load ...
12
votes
1answer
12k views

Difference between after_setup_theme and init action hooks?

What is the difference between the after_setup_theme and init action hooks? It seems they are both called right before any page in WordPress is loaded (even admin pages).
12
votes
1answer
5k views

add_role() run only once?

I was surprised to discover that add_role() modifies the database and fails if the role already exists. There are two implications here, one first more serious than the other: 1) if you're in ...
11
votes
3answers
11k views

Wordpress Update Plugin Hook/Action? Since 3.9

I've researched this a few times, yet my searching does not reveal much except custom code which may or may not be good WordPress practice. As of the latest releases (WordPress 3.9 "Smith"), has a ...
11
votes
5answers
5k views

after_setup_theme always runs

I am setting up a child theme for some of my faculty members, and as a part of the theme, I would like a handful of plugins to be activated at the time that the theme is activated. So, naturally, I ...
11
votes
1answer
18k views

Where is the best place to use add_filter

Should I use the function add_filter In my plugin's init action hook or just the in the main plugin script? Since sometimes I found people is using filter all over the place and if I put in the init ...
10
votes
2answers
29k views

When to use add_action('init') vs add_action('wp_enqueue_scripts')

In my theme's functions.php, I'm calling an add_action in order to gain a measure of control on where jquery is loaded (in the footer along with my theme's other scripts). The problem I'm having is ...
10
votes
3answers
3k views

Remove Actions/Filters added via Anonymous Functions

That's a freaking bad practice I must say. Spent last two hours finding a solution to remove actions and filters added via Anonymous functions. This is the code used on a Parent Theme, and I need ...
10
votes
2answers
10k views

How to do_action and get a return value?

So there is the following scenario. I add an action to clean logs from the database: add_action( 'myplugin_clean_logs', array( 'MyPlugin_Logs', 'clean_logs' ) ); Now I want to run this action ...
10
votes
1answer
2k views

Using jQuery to delete data stored in wp_options

I wonder if anyone could advise me further on my problem. Part of my plugin stores log files for debugging purposes. I have successfully displayed them in a (div#log) in my admin page using jquery ...
10
votes
4answers
249 views

Is there any action filter/hook for validating a custom field before publishing the post?

I have a custom filed called xxxx_url. xxxx_url should be unique. So, before publishing the post, I want to make sure that xxxx_url is unique or not? If it isn't unique, publishing the post should be ...
9
votes
2answers
6k views

What action should I hook into when adding roles and capabilities?

I'm going to be using add_role() and $role->add_cap() to set up a new custom role and attach a new capability to existing roles. I'm wondering where the best place to do this is? Obviously I can do ...
9
votes
10answers
5k views

Remove an action from an external Class

I'm trying to do something similar to this question here: remove_action or remove_filter with external classes? I'm trying to remove the <!-- This site is optimized with the Yoast WordPress ...
9
votes
3answers
8k views

Function to execute when a post is moved to trash .

Hi is there an action which can be performed while a post is moved to trash .... I tried delete_post and deleted_post. It works but twice for each action ( before and after the action as written in ...
9
votes
1answer
4k views

wp_headers vs send_headers. When to use each?

I've seen wp_headers and send_headers both used before for the same thing and I'm wondering how you're suppose to know which one to use and when... On the send_headers codex page there's an example ...
8
votes
2answers
8k views

Remove parent theme action in child

I'm creating a child theme from Storefront. Now I want to remove these action in child theme add_action( 'woocommerce_before_shop_loop','storefront_sorting_wrapper',9 ); by this function: ...
8
votes
2answers
6k views

Earliest hook to reliably get $post/$posts

What's the earliest possible action I can hook into where I'll be able to access the global $post/$posts variables on both the front and back ends? I've tried looking through the Codex reference, Adam ...
8
votes
1answer
4k views

Please explain how these hooks work

I have read about hooks and actions and I know that when we see do_action('some_hook') it means that somewhere add_action('some_hook', function() {...}); or function some_hook() exists in a theme's ...
8
votes
1answer
26k views

Trigger custom action when setting button pressed

This is my first wordpress plugin and I'm running a lot of trouble making it work, it almost work fine but I don't find a way to accomplish this specific thing. Basically I've my custom setting page ...
8
votes
2answers
5k views

Return $post_id when DOING_AUTOSAVE?

I see the following pattern over and over, on this site and on other places: add_action( 'save_post', 'wpse14169_save_post' ); function wpse14169_save_post( $post_id ) { if ( defined( '...
8
votes
4answers
17k views

How to know what priority to use with add_action()?

I was writing a small plugin to remove some menu items for non-admin users from the backend, and discovered that my plugin didn't do anything unless I specified a priority in my code: add_action('...
7
votes
3answers
3k views

Conditional wp_enqueue_script on a page

For efficiency we are trying to hook some JS scripts only a certain page template of a theme that is to hold a form: page-with-form.php On the theme functions.php we've defined a init_method as such:...
7
votes
3answers
515 views

How many filter/action hooks are healthy?

Making my plugin extensible is the next way to solve most people's problems. And I know I can place plenty of filter and action hooks here and there to make things more dynamic. But to me, it's too ...
7
votes
1answer
2k views

Difference between do_action_ref_array() and do_action()

I am having trouble wrapping my head around these two functions. I understand do_action() but I don't see clearly when do_action_ref_array() would be useful. Couldn't we pass an array to do_action() ...
7
votes
2answers
785 views

How to validate XML-RPC post creation and cancel when needed?

I have an IFTTT recipe that creates posts for me on some occasion, but for some weird reason it creates three, sometimes four posts of the same content. I would like to add an add_action hook/...