How to check collection.contains(..) inside a tag ?

Question

Hi,
I'm using both struts and jtsl tags in my jsp. JSP session has a Collection named "responses" that contains string objects.
    <c:forEach items="${page.questions}" var="question" varStatus="i">
          <tr>
               <th align="left"><c:out value="${question.questionId}. ${question.text}"></c:out></th>
          </tr>
        <c:forEach items="${question.answers}" var="answer" varStatus="j">
          <tr>
           <td>     
                     <c:set var="aKey" value="${question.OID}_${answer.OID}"></c:set>
                  <c:if test="${question.type == 1}">
                     <c:out value="${answer.answerId}"/>
                     <input id="<c:out value="KEY_${question.OID}"/>" name="<c:out value="KEY_${question.OID}"/>" type="radio" <c:if test="??? session.getAttribute("responses").contains(${question.OID}_${answer.OID}) ???" ><c:out value="selected=true"/></c:if> value="<c:out value="${question.OID}_${answer.OID}"/>"><c:out value="${answer.text}"/>                 
                  </c:if>
                  <c:if test="${question.type == 2}">
                     <c:out value="${answer.answerId}"/>
                     <input id="<c:out value="KEY_${answer.OID}"/>" name="<c:out value="KEY_${answer.OID}"/>" type="checkbox"  value="<c:out value="${question.OID}_${answer.OID}"/>"><c:out value="${answer.text}"/>                 
                  </c:if>                  
             </td>
        </tr>                  
        </c:forEach>
     </c:forEach>Please see the following line in the code
<c:if test="??? session.getAttribute("responses").contains(${question.OID}_${answer.OID}) ???" ><c:out value="selected=true"/></c:if>I need to check if a collection contains a string value or not. If contains I'm selecting the radio button otherwise not.
Any help will be appreciated!
Thanks

Answer 1

There is no way to tell if a collection contains a value.
If you changed your datastructure to a Map, you can check for the existence of a key in a map, but thats about it.
Alternatively write a static function for this operation, and import it into the jsp as an EL function.
Cheers,
evnafets