Issue #3244408 by stevetweeddale, Anybody: Add AJAX command

facebook_pixel:

  version: 1.0

  version: 2.0

  header: true

  js:

    js/facebook_pixel.js: {}

    - core/jquery

    - core/drupal

    - core/drupalSettings

    - core/drupal.ajax

/**

 * @file

 * facebook_pixel.js

 *

 * Defines the behavior of the facebook pixel module.

 */

(function (Drupal) {

  'use strict';

  Drupal.AjaxCommands.prototype.facebook_pixel_track = function (ajax, response, status) {

    fbq('track', response.event, response.data);

  }

})(Drupal);

<?php

namespace Drupal\facebook_pixel\Ajax;

use Drupal\Core\Ajax\CommandInterface;

/**

 * Logs an event to facebook pixel.

 *

 * This command is implemented in Drupal.AjaxCommands.prototype.facebook_pixel_

 * track.

 */

class FacebookPixelTrackCommand implements CommandInterface {

  /**

   * Event name.

   *

   * @var string

   */

  protected $event;

  /**

   * Event data.

   *

   * @var mixed

   */

  protected $data;

  /**

   * Constructs a \Drupal\facebook_pixel\Ajax\FacebookPixelTrackCommand object.

   *

   * @param string $event

   *   The event name.

   * @param mixed $data

   *   Assigned value.

   */

  public function __construct($event, $data) {

    $this->event = $event;

    $this->data = $data;

  }

  /**

   * {@inheritdoc}

   */

  public function render() {

    return [

      'command' => 'facebook_pixel_track',

      'event' => $this->event,

      'data' => $this->data,

    ];

  }

}