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Can Struts2 be used for conditional validation? As in, if checkbox "Other" is filled in, then field "otherDetails" must not be empty?
Note that I'm looking for Struts2, not Struts1. Any example is greatly appreciated.
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When the user presses the submit button, Struts 2 will automatically execute the validate method and if any of the “if” statements listed inside the method are true, Struts 2 will call its addFieldError method. If any errors have been added, then Struts 2 will not proceed to call the execute method.
1) By Custom Validation Here, we must implement the Validateable interface (or extend ActionSupport class) and provide the implementation of validate method. 2) By Input Validation (built-in validators) Struts 2 provides a lot of predefined that can be used in struts 2 application to perform validation.
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>
See http://struts.apache.org/2.2.1/docs/validation.html for more info.
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