空下拉列表的验证问题

Question

我试图在表单中添加验证，这个输入给我带来了麻烦。我喜欢它做的是在一个新的表单上输入下拉列表将被设置为选择（$ text_select），那将是value =“”然后如果他们尝试提交验证规则将生效。目前没有发生这种情况，我不知道为什么 VIEW：

[使用$ text_select和验证的工作输入]

  <div class="col-sm-5 col-sm-push-1 form-group required">
                        <label class="control-label" ><?php echo $entry_owner; ?></label>
                        <select name="campaign_owner" id="campaign_owner" >
                          <option value=""><?php echo $text_select; ?></option>
                          <?php foreach ($users as $user) { ?>
                          <option value="<?php echo $user['username']; ?>" <?php echo ($campaign_owner == $user['username']) ? 'selected' : ''; ?>><?php echo $user['username']; ?></option>

                          <?php } ?>
                        </select>
                        <?php if ($error_campaign_owner) { ?>
                        <div class="text-danger"><?php echo $error_campaign_owner; ?></div>
                        <?php } ?>
                    </div>

[乱搞输入]

   <div class="col-sm-5 col-sm-push-1 form-group required">
                  <label class="control-label" for="input-active"><?php echo $entry_active; ?></label>
                  <select name="campaign_active" id="input-active" class="form-control">
                  <option value=""><?php echo $text_select; ?></option>                      
                  <?php if ($campaign_active ) { ?>  

                    <option value="1" selected="selected"><?php echo $text_yes; ?></option>
                    <option value="0"><?php echo $text_no; ?></option>
                    <?php } else { ?>
                    <option value="1"><?php echo $text_yes; ?></option>
                    <option value="0" selected="selected"><?php echo $text_no; ?></option>
                    <?php } ?>                    
                  </select>                            
                  <?php if (isset($error_campaign_active)) { ?>
                    <label class="text-danger"><?php echo $error_campaign_active; ?></label>
                  <?php } ?>                   
                </div>

控制器：

[表格功能]

if (isset($this->error['campaign_active'])) {
            $data['error_campaign_active'] = $this->error['campaign_active'];
        } else {
            $data['error_campaign_active'] = '';
        }

[验证功能]

 if (($this->request->post['campaign_active']) == ''){
                $this->error['campaign_active'] = $this->language->get('error_campaign_active');
            }