annotate core/modules/big_pipe/js/big_pipe.js @ 19:fa3358dc1485 tip

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/**
* DO NOT EDIT THIS FILE.
* See the following change record for more information,
* https://www.drupal.org/node/2815083
* @preserve
**/

(function ($, Drupal, drupalSettings) {
  function mapTextContentToAjaxResponse(content) {
    if (content === '') {
      return false;
    }

    try {
      return JSON.parse(content);
    } catch (e) {
      return false;
    }
  }

  function bigPipeProcessPlaceholderReplacement(index, placeholderReplacement) {
    var placeholderId = placeholderReplacement.getAttribute('data-big-pipe-replacement-for-placeholder-with-id');
    var content = this.textContent.trim();

    if (typeof drupalSettings.bigPipePlaceholderIds[placeholderId] !== 'undefined') {
      var response = mapTextContentToAjaxResponse(content);

      if (response === false) {
        $(this).removeOnce('big-pipe');
      } else {
        var ajaxObject = Drupal.ajax({
          url: '',
          base: false,
          element: false,
          progress: false
        });

        ajaxObject.success(response, 'success');
      }
    }
  }

  var interval = drupalSettings.bigPipeInterval || 50;

  var timeoutID = void 0;

  function bigPipeProcessDocument(context) {
    if (!context.querySelector('script[data-big-pipe-event="start"]')) {
      return false;
    }

    $(context).find('script[data-big-pipe-replacement-for-placeholder-with-id]').once('big-pipe').each(bigPipeProcessPlaceholderReplacement);

    if (context.querySelector('script[data-big-pipe-event="stop"]')) {
      if (timeoutID) {
        clearTimeout(timeoutID);
      }
      return true;
    }

    return false;
  }

  function bigPipeProcess() {
    timeoutID = setTimeout(function () {
      if (!bigPipeProcessDocument(document)) {
        bigPipeProcess();
      }
    }, interval);
  }

  bigPipeProcess();

  $(window).on('load', function () {
    if (timeoutID) {
      clearTimeout(timeoutID);
    }
    bigPipeProcessDocument(document);
  });
})(jQuery, Drupal, drupalSettings);