// 商品検索
    $('#searchProductModalButton').on('click', function() {
        ......

        $.ajax({
            type: 'POST',
            dataType: 'html',
            data: {
                'id' : $('#admin_search_product_id').val(),
                'category_id' : $('#admin_search_product_category_id').val()
            },
            url: '{{ url('admin_order_search_product') }}',
            success: function(data) {
                // モーダルに結果を書き出し.
                $('#searchProductModalList').html(data);
            },
            error: function() {
                alert('search product failed.');
            }
        });
    });

    public function searchProduct(Application $app, Request $request, $page_no = null)
    {
            ......

            return $app->render('Order/search_product.twig', array(
                'forms' => $forms,
                'Products' => $Products,
                'pagination' => $pagination,
            ));
    }

# 商品の追加
Order/search_product.twig:
    - [onRenderOrderSearchProduct, NORMAL]

    /**
     * 商品の追加モーダルを修正する.
     *
     * @param TemplateEvent $event
     */
    public function onRenderOrderSearchProduct(TemplateEvent $event)
    {
        $app = $this->app;
        $parameters = $event->getParameters();
        $source = $event->getSource();

        $search = '<div class="extra-form">';
        $replace = '<td class="extra-form">';
        $source = str_replace($search, $replace, $source);

        $search = '{{ form_errors(f) }}';
        $replace = $search.'<br/>';
        $source = str_replace($search, $replace, $source);

        $search = '</div>';
        $replace = '</td>';
        $source = preg_replace('/'.$search.'/', $replace, $source, 1);;

        $event->setSource($source);
    }

# 商品の追加
Admin/Order/search_product.twig:
    - [onRenderOrderSearchProduct, NORMAL]