function google_optimize_page_attachments in Google Optimize 8

Implements hook_page_attachments().

Attach JavaScript to the appropriate scope/region of the page.

File

./google_optimize.module, line 180

google_optimize.module

Code

function google_optimize_page_attachments(array &$attachments) {
  if (!google_optimize_hide_page_active()) {
    return;
  }

  // Create the container string 'GTM-XXXXXX':true,'GTM-YYYYYY':true.
  $container_ids = google_optimize_container_ids();
  $container_ids = array_map(function ($value) {
    return "'" . trim($value) . "':true";
  }, $container_ids);
  $container_str = implode(',', $container_ids);
  $class_name = google_optimize_hide_page_class_name();
  $timeout = google_optimize_hide_page_timeout();
  $js = sprintf("(function(a,s,y,n,c,h,i,d,e){s.className+=' '+y;h.start=1*new Date;\nh.end=i=function(){s.className=s.className.replace(RegExp(' ?'+y),'')};\n(a[n]=a[n]||[]).hide=h;setTimeout(function(){i();h.end=null},c);h.timeout=c;\n})(window,document.documentElement,'%s','dataLayer',%d,\n{%s});", $class_name, $timeout, $container_str);

  // Insert the hide page snippet immediantly before the
  // Google Analytics script. Can't splice to begining of html_head
  // As datalayers-js may be 1st and this would redefine dataLayer.
  foreach ($attachments['#attached']['html_head'] as $key => $tag) {
    if (count($tag) && $tag[1] == 'google_analytics_tracking_script') {
      array_splice($attachments['#attached']['html_head'], $key, 0, [
        [
          [
            '#type' => 'html_tag',
            '#tag' => 'script',
            '#value' => $js,
            '#attributes' => [],
          ],
          'google-optimize-hide-page-js',
        ],
      ]);
      break;
    }
  }
  $css = '.' . $class_name . ' { opacity: 0 !important} ';
  $attachments['#attached']['html_head'][] = [
    [
      '#type' => 'html_tag',
      '#tag' => 'style',
      '#value' => $css,
    ],
    'google-optimize-hide-page-css',
  ];
}