Just fyi -- I think that was fairly clear, its just that the
implementation I was using lost content and I wanted to make sure I was
doing things correctly. :)
By the way, I'm not sure what the doEndTag() exists for. Are there places
where it should be called and release() should/might not?
-Dave
Eduardo Pelegri-Llopart wrote:
>
> 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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