Help needed validating a struts select box

[Sun Jie]

Hi all,

I am trying to validate a select box using Struts 2.1.8.  The select box 
is a required form element, and by default it is empty.  I need to 
validate that values have been put into it before it is submitted.

_Struts select box:_

<s:select name="myIds" list="myList" listKey="id" listValue="name" 
size="8" multiple="true" required="true" theme="simple" />

_Struts XML Validator:_

<field name="myIds">
    <field-validator type="required" >
         <message key="this.is.required"/>
    </field-validator>
</field>

When I use the above snips, the XML validator does not catch that the 
select box is empty.

I have tried using validate() to make sure that an empty select box 
cannot be submitted.  I could not get this to work.  The array I get is 
of size 0 and setting the array to null doesn't help me either.

Does anyone know how to do this?


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