Re: JSTL question: how to use variables in and

[K.C. Baltz]

Absolutely correct.  Check out 
http://www.manning.com/bayern/appendixA.pdf  (Or the google cache which 
is faster: 
http://216.239.39.100/search?q=cache:gSFzaWSumpcJ:www.manning.com/bayern/appendixA.pdf+jstl+appendix&hl=en&ie=UTF-8).   
This explains scope and scripting at a minimal level.  This is the best 
EL reference I've found on the web.

K.C.

Charl Gerber wrote:

Great, thanks for all the help. I'll try it out - I'm sure one (or more)
of the suggestion will help.
I assume in the example below, just like I can have a 'pageScope' there can
also be 'sessionScope', 'requestScope' and 'applicationScope'?
 

-- Oorspronkelijk bericht --
Reply-To: "Tag Libraries Users List" <[EMAIL PROTECTED]>
Date: Mon, 21 Jul 2003 06:44:02 -0700
From: "K.C. Baltz" <[EMAIL PROTECTED]>
To: Tag Libraries Users List <[EMAIL PROTECTED]>
Subject: Re: JSTL question: how to use variables in <c:if> and <c:set>
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.getAtt
 

ibute()  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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