Issue #3214916: Behaviors will not load after AJAX call when using CSP Extras

   *   The XMLHttpRequest status.

   */

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

    var assetsLoaded = 0;

    function onAssetLoad() {

      assetsLoaded += 1;

      // When new scripts are loaded, attach newly added behaviors.

      if (assetsLoaded >= response.assets.length) {

        Drupal.attachBehaviors(document.body, ajax.settings);

      }

    }

    response.assets.forEach(function (item) {

      var elem;

      var target = document.body;

        elem[key] = item.attributes[key];

      });

      if (item.type === "script") {

        elem.onload = onAssetLoad;

      }

      else {

        // Directly mark this element as loaded. We don't have to wait before

        // behaviours can be attached.

        onAssetLoad();

      }

      target.appendChild(elem);

    });

  };