How to iterate over all attributes with pure tags and EL?

[r vertet]

Hi,

is it possible to iterate over all pagecontext-attributes using pure taglibs & el?

Like:

<logic:iterate id="attrName" name="${pageContext.request.attributeNames}">
Name: ${attrName}
</logic:iterate>

or 

<logic:iterate id="attrName" name="${pageContext.request.AttributeNamesInScope(1)}">
</logic:iterate>

If I try this I get the error: Cannot find bean org.apache.catalina.core.ApplicationHttpRequest$AttributeNamesEnumerator@9daa17 in any scope

[Stefan Evans]

I'd go with the JSTL loop rather than the struts loop.
Struts actually deprecated their loop tag in favour of the JSTL one.
Struts and JSTL tags work together without a problem.

EL also makes available some implicit variables: pageScope, requestScope, sessionScope, applicationScope which are maps of the attributes in each scope.
That is easier than using the methods on the request object.

Here is a JSP snippet that will print out all the variables in page scope plus their value

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<h3>Page attributes:</h3>
<table>
 	<c:forEach items="${pageScope}" var="p">
 		<tr>
 			<td>${p.key}</td>
 			<td>${p.value}</td>
 		</tr>
 	</c:forEach>
 </table>

[r vertet]

Thanks. Any tricks available to iterate over the different scopes (page, request, appl, session) via jslt?

[Bear Bibeault]

Is that not what Tim just gave you the code for?

[r vertet]

No, this iterates over the attributes in 1 (!) scope. What I mean is something like this:

<table>  
    <c:forEach items="${allScopes}" var="scope">  
        <c:forEach items="${scope}" var="p">  
            <tr>  
                <td>${p.key}</td>  
                <td>${p.value}</td>  
            </tr>  
        </c:forEach>  
   </c:forEach>  
</table> 

[Bear Bibeault]

There is no Map that aggregates all the scopes. You need to iterate over each scope individually.

[r vertet]

Ok, thanks.