fastadmin后台管理系统，自定义 下拉多选功能

后台代码： 自定义 function edit

   
  public function edit($ids = null)
    {
        $row = $this->model->get($ids);

        if (!$row) {
            $this->error(__('No Results were found'));
        }
        $adminIds = $this->getDataLimitAdminIds();
  
        if (is_array($adminIds) && !in_array($row[$this->dataLimitField], $adminIds)) {
            $this->error(__('You have no permission'));
        }
      
    
     //数据接口，键值=产品id，value=产品名称，为了后面可做匹配
    $groupList = \app\admin\model\info\Products::column('id,title');
	//字符串转成数组
    $products_ids = explode(',', $row['products_ids']);

    $selectedGroups = [];
    foreach ($groupList as $groupId => $groupName) {
       
        if (in_array($groupId, $products_ids)) {
            $selectedGroups[] = $groupId;  //选中状态的匹配
        }
    }
    // print_r($groupList);exit;
    //这里会自动渲染代码
    $this->view->assign('groupList', build_select('row[products_ids][]', $groupList, $selectedGroups, ['class' => 'form-control selectpicker', 'multiple' => 'multiple']));

        if (false === $this->request->isPost()) {
            $this->view->assign('row', $row);
            return $this->view->fetch();
        }

   

        $params = $this->request->post('row/a');
        if (empty($params)) {
            $this->error(__('Parameter %s can not be empty', ''));
        }
        $params = $this->preExcludeFields($params);
        $result = false;
        Db::startTrans();
        try {

            $products_ids = implode(',', $params['products_ids']);
            // 将 group_id 数组转换为字符串
        
            $params['products_ids'] = $products_ids;
            //是否采用模型验证
            if ($this->modelValidate) {
                $name = str_replace("\\model\\", "\\validate\\", get_class($this->model));
                $validate = is_bool($this->modelValidate) ? ($this->modelSceneValidate ? $name . '.edit' : $name) : $this->modelValidate;
                $row->validateFailException()->validate($validate);
            }
            $result = $row->allowField(true)->save($params);
            Db::commit();
        } catch (ValidateException|PDOException|Exception $e) {
            Db::rollback();
            $this->error($e->getMessage());
        }
        if (false === $result) {
            $this->error(__('No rows were updated'));
        }
        $this->success();



    }

前端渲染：

    <!--  采用 fastadmin 原生生成的部分，会出现BUG。
    <div class="form-group">
        <label class="control-label col-xs-12 col-sm-2">{:__('Products_ids')}:</label>
        <div class="col-xs-12 col-sm-8">
          <input id="c-products_ids" data-rule="required" 	data-multiple="true"    data-source="info/products/selectpage" data-multiple="true" class="form-control selectpage" name="row[products_ids]" type="text" value="{$row.products_ids|htmlentities}"> 
    

        </div>
    </div> -->

// 自定义编辑的部分
    <div class="form-group">
        <label class="control-label col-xs-12 col-sm-2">{:__('Products_ids')}:</label>
        <div class="col-xs-12 col-sm-4">
            {$groupList}
        </div>
    </div>