validation for tag

[Raghuveer Rawat]

Hi,  I need help for mandatory field validation for s:select.
I am trying to do client side xml validation.

jsp code for country list:

<s:select name="user.country" headerKey="-1" headerValue="Select Country"
                            list="countryList" listKey="code"
listValue="name" required="true" />

I tried with below validation code but it is not working.. Not sure what
will be other approach..

<field name="user.country">
        <field-validator type="fieldexpression">
            <param name="expression"><![CDATA[user.country ==
'-1']]></param>
             <message key="required.country"></message>
        </field-validator>
    </field>

  Thanks a lot...