If you use <c:set var="totalPosts" value="${requestScope.TotalPosts}" />
then <c:out value="${totalPosts}" /> will work on the same JSP.
Otherwise <c:set var="totalPosts" value="${requestScope.TotalPosts}" scope="request"/>
is required for the variable to be available at <c:out
value="${requestScope.totalPosts}" />
*Note the case of totalPosts and TotalPosts above and the scope variable used*
Without calling a c:set method (and the variable TotalPosts exists on the request)
then <c:out value="${requestScope.TotalPosts}" /> should work fine.
It can get confusing when using similiarly named variables or same name different case
variables.
You should try and avoid it for sake of your sanity and readability :)
hth
Chris McCormack
-----Original Message-----
From: Karr, David [mailto:[EMAIL PROTECTED]
Sent: 21 June 2004 16:09
To: Struts Users Mailing List; [EMAIL PROTECTED]
Subject: RE: Please Help Me To Convert My JSP Scripting Elements To
<c:set ..> <c:out ..> Tags
> -----Original Message-----
> From: Caroline Jen [mailto:[EMAIL PROTECTED]
>
> I am converting all the scripting elements in my JSP
> to <c:.... > tags. I have decided to go one step at
> the time -- I only want to print out one basic number
> as a start.
>
> My action class passes an object "TotalPosts" in
> the following way to my JSP:
>
> request.setAttribute( "TotalPosts", new Integer(
> totalPosts ) );
> return ( mapping.findForward( "success" ) );
First of all, you probably should use property names that begin with a
lowercase letter. It just might work beginning with a capital, but you
also may run into unexpected trouble.
> Now, I have the struts-html-el.tld downloaded and put
> the following in my application's web.xml file:
>
> <taglib>
> <taglib-uri>/tags/struts-html-el</taglib-uri>
>
> <taglib-location>/WEB-INF/lib/struts-html-el.tld</taglib-location>
> </taglib>
>
> And in my JSP, I imported the following:
>
> <%@ taglib uri="/tags/struts-html-el" prefix="html" %>
> <%@ taglib uri="/tags/struts-bean" prefix="bean" %>
> <%@ taglib uri="/tags/struts-logic" prefix="logic" %>
> <%@ taglib uri="/tags/tiles" prefix="tiles" %>
Assuming you're using a standard Servlet 2.3 container, you might
consider using the "normalized" URI for each taglib (the value of the
"uri" property in the tld). This allows you to avoid having to store
the TLD separately from the taglib jar, and avoids the need to add the
taglib element to your web.xml. It still requires the taglib directive
in the JSP (using the normalized URI).
Also, as another posted pointed out, you're missing the "core" taglib
directive. Without that, your reference to the "c:out" tag would have
been untranslated (the html output would still contain "<c:out .../>".
> I replaced:
>
> int totalPosts = ( ( Integer )request.getAttribute(
> "TotalPosts" ) ).intValue();
> with
> <c:set var="totalPosts"
> value="${requestScope.TotalPosts}" />
Note that there's no need to do this. If the variable is already
available in request scope, there's no need to set it into another
variable in page scope.
> And I replaced:
>
> <%=totalPosts%>
> with
> <c:out value="${requestScope.totalPosts}" />
>
> I cannot print out anything. I got a 'BLANK'.
>
> There must be something I missed. What did go wrong?
If your property name was "totalPosts", instead of "TotalPosts", and you
had the correct taglib directive in your JSP, then this should have
worked.
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