From: "Eric Plante" <[EMAIL PROTECTED]>
I have a logic:iterate on a Map. let say that the object name obj is taken
out of the Map. I use obj inside the logic:iterate to get the key and
value of each obj without a problem.
Now, what I need to do is to use the obj's key on another Map in the form
object
The tag is supposed to print out the String value for obj's key in
hashMap, obj come from treeMap.
So your form has two Maps that are keyed alike? I don't think you need a
custom tag (or Struts tags) at all. This iterates over a treeMap and uses
the key of each 'obj' as the key into a hashMap:
<c:forEach items="${treeMap}" var="obj" >
${hashMap[obj.key]}
</c:forEach>
That's with the Maps in request scope... if they're coming from the form
bean, it would be items="${formBeanName.treeMap}" (assuming there is a
getTreeMap method on your form bean.)
The above also assumes JSTL 1.1. If you're using JSTL 1.0 you'd need a
<c:out value="..." /> in the
middle rather than just the expression.
Here's the JSP I was using to play with this:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core"; prefix="c" %>
<%
java.util.TreeMap treeMap = new java.util.TreeMap();
treeMap.put( "key1", "value1" );
treeMap.put( "key2", "value2" );
request.setAttribute( "treeMap", treeMap );
java.util.HashMap hashMap = new java.util.HashMap();
hashMap.put( "value1", "description1" );
hashMap.put( "value2", "description2" );
hashMap.put( "key1", "descByKey1" );
hashMap.put( "key2", "descByKey2" );
request.setAttribute( "hashMap", hashMap );
%>
<c:forEach items="${treeMap}" var="obj" >
${hashMap[obj.value]}
</c:forEach>
<hr/>
<c:forEach items="${treeMap}" var="obj" >
${hashMap[obj.key]}
</c:forEach>
If you need help adding JSTL to your webapp, just ask. (We need to know
what version of the Servlet specification you're working with-- Servlet 2.4
(Tomcat 5.x) or something else?)
HTH,
--
Wendy Smoak
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