Struts验证框架如何验证下拉菜单未选择

侠路相逢 2018-04-10 01:32:42

Struts 代码段：
<field name="role">
<field-validator type="required">
<message>请选择权限</message>
</field-validator>
</field>
JSP代码段：
<select name="role" id="role">
<option selected="selected">请选择权限(select your role)</option>
<option value="op">作业员(Operator)</option>
<option value="sv">管理员(Supervisor)</option>
</select>

以上在表单下拉菜单未选择的情况下，struts的验证框架没反应，不提示错误，直接将下拉菜单中的“请选择权限（select your role）” 作为参数提交了。

如何可以做到未选择的情况下，提示field error,求指点

...全文

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{24.12.3}many-to-many}{414}{subsection.24.12.3} {24.12.4}双向关联映射}{416}{subsection.24.12.4} {24.12.5}关系表}{417}{subsection.24.12.5} {24.12.6}Hibernate继承关系}{418}{subsection.24.12.6} {24.12.7}Hibernate组件映射}{419}{subsection.24.12.7} {24.13}HQL语句}{420}{section.24.13} {24.14}QBC语句}{422}{section.24.14} {24.15}使用SQL语句}{422}{section.24.15} {24.16}Hibernate缓存}{423}{section.24.16} {24.16.1}一级缓存}{423}{subsection.24.16.1} {24.16.1.1}批处理}{424}{subsubsection.24.16.1.1} {24.16.2}二级缓存}{424}{subsection.24.16.2} {24.16.3}查询缓存}{427}{subsection.24.16.3} {24.17}Hibernate锁机制}{428}{section.24.17} {24.17.1}悲观锁}{428}{subsection.24.17.1} {24.17.2}乐观锁}{429}{subsection.24.17.2} {24.18}Ant及Maven}{429}{section.24.18} {24.19}Hibernate注解}{429}{section.24.19} {25}Spring}{430}{chapter.25} {25.1}概念}{430}{section.25.1} {25.2}Spring开发}{431}{section.25.2} {25.2.1}依赖注入}{431}{subsection.25.2.1} {25.2.2}集合注入}{433}{subsection.25.2.2} {25.3}log4j}{434}{section.25.3} {25.4}Spring容器}{435}{section.25.4} {25.5}Spring容器对Bean对象的管理}{436}{section.25.5} {25.5.1}lazy-init}{436}{subsection.25.5.1} {25.5.2}Bean对象的初始化与销毁}{437}{subsection.25.5.2} {25.6}AOP与代理模式}{437}{section.25.6} {25.6.1}动态代理模式}{438}{subsection.25.6.1} {25.6.2}Spring代理模式}{440}{subsection.25.6.2} {25.6.2.1}第一种情况}{440}{subsubsection.25.6.2.1} {25.6.2.2}第二种情况}{441}{subsubsection.25.6.2.2} {25.6.2.3}第三种情况：使用schema配置}{443}{subsubsection.25.6.2.3} {25.7}单例模式及Bean的作用域}{445}{section.25.7} {25.8}Spring JDBC}{446}{section.25.8} {25.9}Spring与Struts2集成}{448}{section.25.9} {25.10}Struts2, Spring, Hibernate}{450}{section.25.10} {25.10.1}spring-test: 使用注解方式测试}{455}{subsection.25.10.1} {25.11}Spring管理Hibernate}{456}{section.25.11} {25.12}分层管理Spring配置文件}{462}{section.25.12} {25.13}Spring中的Hibernate懒加载}{462}{section.25.13} {25.14}Spring中文过滤器}{463}{section.25.14} {25.15}Spring读取属性(.properties)文件}{464}{section.25.15} {25.16}Spring中的Hibernate数据库操作}{465}{section.25.16} {25.17}分页查询}{465}{section.25.17} \contentsline {chapter}{Todo list}{478}{lstnumber.-637.8} {A}T-GWAP}{480}{appendix.A} {A.1}PO}{480}{section.A.1} {A.2}DAO}{480}{section.A.2} {A.2.1}使用连接池}{480}{subsection.A.2.1} {A.3}BO}{485}{section.A.3} {A.3.1}ThreadLocal}{486}{subsection.A.3.1} {A.4}FC}{486}{section.A.4} {A.5}View}{486}{section.A.5} {A.6}框架}{486}{section.A.6} {A.6.1}简单工厂}{486}{subsection.A.6.1} {B}问题}{489}{appendix.B} \contentsline {chapter}{Index}{491}{section*.9} {B.0.2},}{491}{subsection.B.0.2}

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