Struts2 Validation - skip validation for certain fields

[Anand Krishnanandam]

Hi,
I want to validate couple of fields based on the checkBox value.
(checkbox doesn't need validation though)
ex:

if(checkBox.value=false){
validate
name
address
city
graduate school
}else if (checkBox.value=true)
{
skip validation for graduate school
}

  <field name="name">
      <field-validator type="requiredstring">
  <message key="errors.default.required"/>
</field-validator>
  </field>
  <field name="address">
      <field-validator type="requiredstring">
  <message key="errors.default.required"/>
</field-validator>
  </field>
    <field name="city">
        <field-validator type="required">
    <message key="errors.default.required"/>
    </field-validator>
    </field>
[B]    <field name="graduate school">
        <field-validator type="required">
    <message key="errors.default.required"/>
    </field-validator>
    </field>[/B]

any example code or link would be very helpful
Thanks,
Anand

[David Newton]

For a simple case like this where there's only one validation that depends on the checkbox value it'd be easy enough to use the expression validator, which accepts arbitrary expressions.

Anything substantially more complicated than that and I usually end up pushing the validation into Java by using a validate() method.

[Anand Krishnanandam]

something like ?

<field name="graduteSchool">
        <field-validator type="fieldexpression">
  <param name="expression"><![CDATA[(checkBox !=true && graduateSchool!=null) or (checkBox==true && graduateSchool==null)]]></param>
  <message key="errors.default.required"/> 
    </field-validator>
    </field>