如何在 struts 2 框架中验证选择标签 [英] How to validate a select tag in struts 2 framework

问题描述

我是编程的新手，目前我是一名初级程序员.我目前在验证其中一种表单中的选择标签时遇到了一些问题.我真正想做的是确保在用户提交表单之前选择了一项.

I am a newbie into programming and i am currently employed as a junior programmer. I am currently having some problems validating the select tags in one of my forms. What i actually trying to do is to ensure that one item is selected before the user submits the form .

以我有的形式；

<s:select list="assessmentTypes" headerKey="0" headerValue=" -- Select One --"
          listKey="id" value="name" listValue="name" key="course.assessmenttype"
          name="assessmenttype.id"/>

我有一些验证知识，但不确定如何为选择列表执行此操作.

I have some knowledge of validation but not to sure how to do it for the select list.

我尝试对字符串使用普通验证，但我认为在这种情况下不需要它.例如;

I tried using a normal validation with strings but i don't think it is required in this case. for example;

<field name="course.assessmenttype">
    <field-validator type="requiredstring">
        <message>Please Select a value</message>
    </field-validator>
</field>

感谢所有帮助，提前致谢.

all help would be appreciated, Thanks in advance.

推荐答案

将 headerKey="0" 设置为 headerKey=""

Set headerKey="0" to headerKey=""

<field name="course.assessmenttype">
          <field-validator type="requiredstring">
              <param name="trim">true</param>
              <message>Please Select a value to continue</message>
          </field-validator>
</field>

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