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jspscopeelscriptlet

How to evaluate a scriptlet variable in EL?

I was wondering if there was anyway of using JSP in <c:if> statement.

E.g.

<c:if test="${ param.variable1 == 'Add' <% JSP variable clause %>}">

So I want my JSP variable to checked against as well.

Any suggestions? I have tried ignorantly just sticking in the clause, obviously it did not work.

Thanks

Solution

  • So you want to evaluate a scriptlet variable in EL? Store it as a request attribute. The below example will make it available as ${foo}.

    <%
    String foo = "some";
    request.setAttribute("foo", foo);
%>

<c:if test="${param.variable1 == 'Add' && foo == 'some'}">

    However, this makes no sense. You should avoid scriptlets altogether and use JSTL/EL to prepare this variable. So if you make the functional requirement more clear, e.g. "How do I do this (insert scriptlet code snippet) using JSTL/EL?", then we'll be able to suggest the right approach.

    For example, you could use <c:set> to set a variable in EL scope.

    <c:set var="foo" value="some" scope="request" />

    Or if the JSP is forwarded by a servlet, then use request.setAttribute() over there right away.

    String foo = "some";
request.setAttribute("foo", foo);
request.getRequestDispatcher("/WEB-INF/your.jsp").forward(request, response);

    This will then be available as ${foo} the same way.

    See also: