如何使用 Struts2 验证进行条件验证? [英] How to use Struts2 validation for conditional validation?

问题描述

Struts2 可以用于条件验证吗?比如，如果复选框Other"被填写，那么字段otherDetails"不能为空?

Can Struts2 be used for conditional validation? As in, if checkbox "Other" is filled in, then field "otherDetails" must not be empty?

请注意，我正在寻找 Struts2，而不是 Struts1.非常感谢任何示例.

Note that I'm looking for Struts2, not Struts1. Any example is greatly appreciated.

推荐答案

您或许可以使用表达式验证器.如果您通过 XML 进行验证，您应该有如下内容:

You can probably use an expression validator. If you're validating via XML, you should have something like:

<validators>

  <validator type="expression">
    <param name="expression">(other && (otherDetails!=null && otherDetails.trim()!=""))</param>
    <message>You must provide other details.</message>
  </validator>

</validators>

参见 http://struts.apache.org/2.2.1/docs/validation.html 了解更多信息.

See http://struts.apache.org/2.2.1/docs/validation.html for more info.

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