Dave Navas asked:
=========
A quick btw -- if someone can 'splain to me how this kind of tag:
<setPageData> <myCustomTag/> </setPageData>
can capture its body, I'd sure appreciate it. Maybe it's just the
engine I'm
using, but I'm not clear as to how that's accomplished. It seems like
all I
have is a writer. I can probably get the contents out of it, but how do
I
prevent the output from ending up on the page?
==========
In the JSP 1.1 PR1, you (your tag handler) has to first indicate it is
interested in handling the body. It does that by returning EVAL_BODY
from the doStartTag() method. The JSP page implementation class will
then create a BodyJspWriter object and will pass it to the Tag class.
Then the methods doBeforeBody() will be evaluated; the BODY will be
evaluated into this new object, and finally doAfterBody() will be
evaluated [[in some cases the doBeforeBody() will be a noop]]. A
typical example will at this point take the BodyJspWriter (that got
passed in before) and extract from it whatever information it wants
(that is why it is a BodyJspWriter, not a plain JspWriter). If you want
to reevaluate the body (say because something somewhere has changed),
just have doAfterBody() return EVAL_BODY; if not, make it return
SKIP_BODY.
Hope this helps.
- eduard/o
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