I am using Tomcat 4.1.18 right now, so for the time being I'll just send
null for the attribute variables into the ExpressionEvaluatorManager.
Thanks Shawn and Tim (and the taglibs-user community),
James Smith
Developer, Treistman Center
College of Fine Arts, University of Arizona
----- Original Message -----
From: "Shawn Bayern" <[EMAIL PROTECTED]>
To: "Tag Libraries Users List" <[EMAIL PROTECTED]>
Sent: Friday, March 21, 2003 9:08 AM
Subject: Re: Evaluating BodyContent
> JSP 2.0 (for which standard Tomcat 5.0 is a compliant container) shifts
> the responsibility of evaluating EL expressions to the container, not
> individual tag handlers. If you're writing an application for JSP 1.2,
> you could theoretically use our ExpressionEvaluatorManager to parse
> expressions from anywhere, including BodyContent; simply ignore the
> arguments associated with tag attributes.
>
> Note that without JSP 2.0's support, retrieving expressions from
> BodyContent and parsing them at doEndTag() (or some other fixed point) can
> be extraordinarily confusing to users. Consider the following situation:
>
> <my:tag>
> ${a}
> <c:set var="a" value="${...}" />
> </my:tag>
>
> The user will probably expect ${a} to evaluate to its original value, but
> if the tag's only opportunity to read and parse the content comes within
> doEndTag(), ${a}'s evaluation will be affected by the <c:set> that occurs
> *after* its presence in the page.
>
> --
> Shawn Bayern
> "JSTL in Action" http://www.manning.com/bayern
>
> On Fri, 21 Mar 2003, Tim Kettering wrote:
>
> > If I understand correctly, a JSP 2.0 container will let you use EL 2.0
expressions anywhere in the jsp body without having to use the JSTL tags. I
also believe that Tomcat 5 is a JSP 2.0 container, and that support may
already be there, I have no idea though. Someone else may be able to answer
that better.
> >
> > -tim
> >
> > On Friday, March 21, 2003, at 10:21AM, James Smith <[EMAIL PROTECTED]
a.edu> wrote:
> >
> > >I'm writing a custom tag where I would like to, if possible, evaluate
the EL
> > >expressions that may be present within the tag's BodyContent. The
> > >ExpressionEvaluatorManager seems to need EL expressions to be tied to
an
> > >attribute of the tag. Is it possible to evaluate the BodyContent? If
so,
> > >how? If not, will this issue be resolved in JSP 2.0? Thanks much,
> > >
> > >James Smith
> > >Developer, Treistman Center
> > >College of Fine Arts, University of Arizona
> > >
> > >
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