Is it not possible to call the libraries that are underneath the taglibs?
I've not delved into other taglibs much, but the way I've been writing
mine is that the taglib is really just an adaptor that sits on top of a
generic Java library. That way, the user can call the library if need be.
Bay
On Thu, 7 Feb 2002, Shawn Bayern wrote:
> On Thu, 7 Feb 2002, Lomvardias, Christopher wrote:
>
> > Hi,
> >
> > I'm just getting started working with some of the Jakarta Taglibs. One
> > thing I'm interested in doing is something like this.
> >
> > Let's say I've run a query and returned a result and want to place the
> > value of a column into local variable. This obviously bombs.
> >
> > How would I do this?
>
> Not as such. :-)
>
> You have a few choices. You can manually invoke the tag handler class and
> call its methods (doStartTag(), doEndTag(), and so on), capturing its
> output manually. This is somewhat tedious and error prone, and I wouldn't
> recommend it. Alternatively, you can cause the tag to expose a scripting
> variable -- that is, a variable accessible to scriptlet code. The tag
> needs to have this feature built in, however (by convention, using the
> "id" attribute) so that you can write code like this:
>
> <custom:tag id="foo" />
> <%= foo %>
> <% methodCall(foo); %>
>
> DBTags's <sql:getColumn> tag, and the standard JSTL database tags, don't
> support scripting variables; overall, scripting code (Java within JSP
> pages) is being de-emphasized. Instead, they expose outputs as scoped
> variables that you can access with pageContext.findAttribute(). DBTags's
> <sql:getColumn> has a "to" attribute that names the scoped attribute
> exported:
>
> <sql:getColumn colName="fname" to="fname" />
> <%= pageContext.findAttribute("fname"); %>
>
> The JSP Standard Tag Library (JSTL) introduces the convention of using an
> attribute named 'var' to expose scoped variables, as
>
> <c:set var="foo">
> Foo!
> </c:set>
>
> // use 'foo' here
>
> For more information on what replaces scripting variables and Java code
> directly in JSP pages, you might be interested in an article I've recently
> written on the subject. You can get to it from the front page of Manning
> Publications's web site at
>
> http://www.manning.com
>
> Hope that helps explain things,
>
> --
> Shawn Bayern
> Author, "JSP Standard Tag Library" (upcoming, Manning) http://jstlbook.com
>
>
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