Re: JSTL question: how to use variables in and

[K.C. Baltz]

All the JSTL tags use EL ("Expression Language") which generally looks 
like ${ ... }.  All of the variables referenced in EL are in some sort 
of scope, (page, request, session, application).  That scope is handled 
by HashMaps (E.g. request.getAttribute()  what's used for requestScope 
variables). 

Scriptlets and tags that take scriptlets in their attributes use RT 
Expressions (RunTime?).  A variable named in a scriptlet is simply a 
local variable to the servlet that is generated for the JSP.  In order 
to access an RT Expr variable from JSTL scripts, you need to stuff the 
the RT variable into one of those HashMaps.  So:

<%
   int i = 5;
   pageContext.setAttribute( "i", new Integer(i) );  // doesn't have to 
be "i"
%>

<c:if test="${row.ID == pageScope.i} >

</c:if>

Charl Gerber wrote:

Hi,

I have a question. How can I use variables declared in other pieces of java
code withing my JSP within a <c:if> piece of code?
example:

<%
 int i = 5;
 * now to a sql call with sql tags and get some results *
 <c:if test="${row.ID == i}">
   etc.
%>
I cannot get that row.ID == i to work. Also tried <%= i %>, but that causes
casting exceptions.
Alternatively, how can I make SQL results available to other pieces of Java.
At the moment I do a <c:set> and then the other code gets the variable from
the scope it was set to, but it seems a bit tedious... is there a shorter
way?
Thanks!

Charl

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