google_tag_events-8.x-1.x-dev/google_tag_events.module

<?php

/**
 * @file
 * Contains google_tag_events.module.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function google_tag_events_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the google_tag_events module.
    case 'help.page.google_tag_events':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The Google Tag Manager: Events module provides
       API to push events to GTM Datalayer from PHP.') . '</p>';

      return $output;
  }
}

/**
 * Get GTM events service.
 *
 * @return \Drupal\google_tag_events\GoogleTagEvents
 *   GTM events service.
 */
function google_tag_events_service() {
  return \Drupal::service('google_tag_events');
}

/**
 * Implements hook_page_attachments().
 */
function google_tag_events_page_attachments(array &$attachments) {
  $attachments['#attached']['library'][] = 'google_tag_events/tracking';
  // Add events to drupal settings.
  google_tag_events_service()->processCurrentEvents($attachments);
}

/**
 * Implements hook_ajax_render_alter().
 */
function google_tag_events_ajax_render_alter(array &$data) {
  // Add events to drupal settings.
  // Set it first to avoid issues with invoking attachment behavior
  // after executing commands.
  array_unshift($data, google_tag_events_service()->processAjaxCommandCurrentEvents()->render());
}

/**
 * Implements hook_page_bottom().
 */
function google_tag_events_page_bottom(array &$page_bottom) {
  $page_bottom['google_tag_events'] = [
    '#lazy_builder' => [
      'google_tag_events.lazy_builder:getEvents',
      [],
    ],
    '#create_placeholder' => TRUE,
  ];
}