docs: function () {
              var url = this.getUrl();
              var pageId = this._cache[url] ? this._cache[url].id : null;
              if (pageId) {
                  if (this._navigate) {
                      this.$callback(this._navigate, {
                          pageId : pageId,
                          url : url
                      });
                  }
              } else {
                  this._addInCache(url, this._lastPageId);
              }
          }