I created a Theme Options page where the user can edit some of the theme settings. Now I'm trying to save this options asynchronously but it seems I have some problems integrating the handler file into WP.

The Theme Options is a simple admin page nested under Appearance.

When pressing the save button:

<a id = "save-settings" href = "#" data-nonce = "<?php wp_create_nonce("sace_settings_nonce") ?>"><?php echo _('Save Settings') ?></a>

the following JS script is called:

        type : 'POST',
        url : themeRoot + 'framework/AsyncAction.php',
        data: { action  : 'save_settings',
                name    : 'John',}
        }).done(function(resp) {

The handler .php file contains:

define ('SAVE_SETTINGS', 'save_settings');

add_action('wp_ajax_save_settings', 'save_settings');

function save_settings(){
    global $controller;
    $name = esc_attr($_POST['name']);
    echo 'Hi, ' . $name;


Running this code throws the following error:

Fatal error: Call to undefined function add_action()

I also tryied:

  1. hook the action on init -> same problem
  2. remove the hook completely. This caused the undefined error to be thrown for esc_attr()

It seems that I don't have access to any of the WP functions but I have no idea how to fix it.



Wordpress has a native AJAX file that should do all that you want, and this will ensure that all native WP functions are included. If you require additional functionality from 'framework/AsyncAction.php', you can include_once(), as you do with 'SettingsController.php'.

See the Codex for more information and examples - AJAX in Plugins

If you wish to use AJAX on the front end of your website, you need to add the following lines to your functions.php file -

/** Declare the URL to the file that handles the AJAX request (wp-admin/admin-ajax.php) */
wp_enqueue_script('my-ajax-request', admin_url('admin-ajax.php'), array('jquery'));
wp_localize_script('my-ajax-request', 'MyAjax', array('ajaxurl' => admin_url('admin-ajax.php')));
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