Codeigniter Ajax Çalışmıyor - Ücretli Yardım

    public function delete()
    {
        $id = $this->input->post('id');
        if ($id) {
            $this->menu_model->get_descendants($id);
            if (!empty($this->ids)) {
                $ids = implode(', ', $this->ids);
                $id = "$id, $ids";
            }

            $res = $this->menu_model->delete_menu($id);
            if ($res) {
                $response['success'] = true;
            } else {
                $response['success'] = false;
            }
            header('Content-type: application/json');
            echo json_encode($response);
        }
    }

    /* delete menu item
    ------------------------------------------------------------------------- */
    $('body').on('click', '.delete-menu', function () {
        var li = $(this).closest('li');
        var param = {id: $(this).next().val()};
        var menu_title = $(this).parent().parent().children('.ns-title').text();
        gbox.show({
            content: '<h2>Delete Menu Item</h2>Are you sure you want to delete this menu item?<br><b>'
                + menu_title +
                '</b><br><br>This will also delete all sub items.',
            buttons: {
                'Yes': function () {
                    $.post(_BASE_URL + 'admin_controller/delete', param, function (data) {
                        if (data.success) {
                            gbox.hide();
                            li.remove();
                        } else {
                            gbox.show({
                                content: 'Failed to delete this menu item.'
                            });
                        }
                    });
                },
                'No': gbox.hide
            }
        });
        return false;
    });

<a href="#" class="delete-menu" title="Delete">