Re: el eval v literal

From:
grasp06110@gmail.com
Newsgroups:
comp.lang.java.programmer
Date:
Wed, 10 Sep 2008 07:43:54 -0700 (PDT)
Message-ID:
<a5812f19-2645-47d0-8797-720a89faa213@m73g2000hsh.googlegroups.com>
On Sep 10, 7:28 am, grasp06...@gmail.com wrote:

Hi Everybody,

Is there a way to get an eval of a el expression. I'm trying to
display the contents of an ArrayList that exists in the session by
passing in the name of the list so I would like to do something like
send the following request:

http://myPage?listName=myList

and then get the list from the session and iterate through it to
display the contents. I was hoping that ${param.listName} would
evaluate to the literal string myList in a statement such as:

${${listName}}

and then I could do something like:

<c:forEach var="current' items="${${listName}} >

is there a way to do this?

Thanks,
John


This works but requires knowing the object is in the session up front:

<html>

    <%@ page isELIgnored="false" %>
    <%@ taglib uri="/tld/jstl/c.tld" prefix="c" %>

    <body>
        <h2>${param.name}</h2>
        <table>
            <jsp:scriptlet>
                String listName = request.getParameter("name");
                Object list = request.getSession().getAttribute(listName);
                request.setAttribute("list", list);
            </jsp:scriptlet>
            <c:forEach var="row" items="${list}">
                <tr>
                    <td>
                        ${row}
                    </td>
                </tr>
            </c:forEach>
        </table>
        <br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
        <br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
        <br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
    </body>

</html>

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