struts2 中字段验证器的动态字段名称 [英] dynamic field name for field validator in struts2

问题描述

我有这个班

public Class Employee
{
    String name;
    List<Address> listOfAddress;
}

public Class Address
{
    String location;
    String streetName;
}

在我的 JSP 页面中，我是这样填写的

in my JSP page i have filled like this

 <s:textfield id="streetName" name="listOfAddress[%{listOfAddress.size()}].streetName" size="20" maxlength="24" cssStyle="width: 100px" />

每次我提交页面时，都会将一个时间对象添加到列表中，因此大小将增加一.当我查看上一个textField的源HTML时，它的名字看起来像这样 listOfAddress[0].streetName ，如果我在添加成功后提交JSP页面，它会返回到同一个页面，这个textfield的名字会是listOfAddress[1].街道名称如果你查看它的 HTML 源代码

each time i submit the page an object of time Address is added to the list therefore the size will increase by one. when i view the source HTML of the previous textField, its name looks like this listOfAddress[0].streetName , if i submit the JSP page after succefull addition, it will return to the same page and the name of this textfield will be listOfAddress[1].streetName if you view its HTML source

像这样，我可以向同一个 Employee 对象添加任意数量的地址.

and like this i can add as many addresses as i want to same Employee object.

到目前为止一切正常.问题是当我想验证这个字段时，我不能，因为它是动态的如果我进行此验证，它将仅在第一次验证.

so far everything is OK. the problem is when i want to validate this field ican't because it is dynamic if i put this validation it will validate it the first time only.

     <field name="listOfAddress[0].streetName">
        <field-validator type="requiredstring" short-circuit="true">
           <param name="trim">true</param>
           <message>sorry this field is required field</message>
       </field-validator>
    </field> 

我想要的是根据列表的大小使列表listOfAddress"的索引动态化.

what i want is to make the index of the list "listOfAddress" dymanic according to the size of the list.

我不知道如何从jsp动态传递它

i don't know how to pass it dynamicall from the jsp

我可以做这样的事情吗?

can i do something like this ?

    <field name="listOfAddress[**${dynamic index value}**].streetName">
        <field-validator type="requiredstring" short-circuit="true">
           <param name="trim">true</param>

           **<param name="myIndex">${dynamic index value}</param>**

           <message>sorry this field is required field</message>
       </field-validator>
    </field> 

或者将动态值传递给自定义验证器?

or pass the dynamic value to a custom validator ?

请帮帮我，如何在索引动态时验证列表

please help me, how to validate the list when the index is dynamic

推荐答案

使用访问者验证器.请参阅 http://struts.apache.org/2.x/docs/using-visitor-field-validator.html.

Use visitor validator. See http://struts.apache.org/2.x/docs/using-visitor-field-validator.html.

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