silverstripe / silverstripe-cms

            new FieldList()

        )->setHTMLID('Form_ListViewForm');

        $listview->setAttribute('data-pjax-fragment', 'ListViewForm');

        $listview->setValidationResponseCallback(function () use ($negotiator, $listview) {

            $request = $this->getRequest();

            if ($request->isAjax() && $negotiator) {

                $listview->setupFormErrors();

                $result = $listview->forTemplate();

                return $negotiator->respond($request, array(

                    'CurrentForm' => function () use ($result) {

                        return $result;

                    }

                ));

            }

        });

        $this->extend('updateListView', $listview);

        )->setHTMLID('Form_AddForm');

        $form->setAttribute('data-hints', $this->SiteTreeHints());

        $form->setAttribute('data-childfilter', $this->Link('childfilter'));

        $form->setValidationResponseCallback(function () use ($negotiator, $form) {

            $request = $this->getRequest();

            if ($request->isAjax() && $negotiator) {

                $form->setupFormErrors();

                $result = $form->forTemplate();

                return $negotiator->respond($request, array(

                    'CurrentForm' => function () use ($result) {

                        return $result;

                    }

                ));

            }

            return null;

        });

        $form->addExtraClass('flexbox-area-grow fill-height cms-add-form cms-content cms-edit-form ' . $this->BaseCSSClasses());

        $form->setTemplate($this->getTemplatesWithSuffix('_EditForm'));