do_action( "wp_ajax_{$action}" )

Fires authenticated Ajax actions for logged-in users.

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Description

The dynamic portion of the hook name, $action, refers to the name of the Ajax action callback being fired.

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More Information

  • This hook allows you to handle your custom AJAX endpoints. The wp_ajax_ hooks follows the format “wp_ajax_$action“, where $action is the ‘action‘ field submitted to admin-ajax.php.
  • This hook only fires for logged-in users. If your action only allows Ajax requests to come from users not logged-in, you need to instead use wp_ajax_nopriv_$action such as: add_action( 'wp_ajax_nopriv_add_foobar', 'prefix_ajax_add_foobar' );. To allow both, you must register both hooks!
  • See also wp_ajax__requestaction
  • See also Ajax Plugin Handbook

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Source

File: wp-admin/admin-ajax.php. View all references 

do_action( "wp_ajax_{$action}" );

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Changelog

Changelog
Version Description
2.1.0 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 3You must log in to vote on the helpfulness of this note
    Contributed by Steven Lin —

    Example migrated from Codex:

    If you need to create an AJAX handler for an “add_foobar” request, you would create a hook like this:

    add_action( 'wp_ajax_foobar', 'my_ajax_foobar_handler' );

function my_ajax_foobar_handler() {
    // Make your response and echo it.

    // Don't forget to stop execution afterward.
    wp_die();
}

    The following code is an example using jQuery that would trigger the above hook.

    jQuery.post(
    my_foobar_client.ajaxurl, 
    {
        'action': 'foobar',
        'foobar_id':   123
    }, 
    function(response) {
        console.log('The server responded: ', response);
    }
);

    Note: The foobar_id would be available in your PHP hook handler via $_POST['foobar_id'].

  2. Skip to note 2 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note
    Contributed by Dhimas Kirana —

    using wp_send_json() to output your result as a json format

    add_action( 'wp_ajax_foobar_json', 'my_ajax_foobar_json_handler' );
function my_ajax_foobar_json_handler() {
    // Your response in array
	$array_result = array(
		'data' => 'your data',
		'message' => 'your message'
	);

    // Make your array as json
	wp_send_json($array_result);
 
    // Don't forget to stop execution afterward.
    wp_die();
}

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