> a few hundered different links/actions in that case. I had hoped to
be able to
> generate a session-specific version of a destination-url like
>  http://my-host/noticeclick?targetid=4711

If there are so many actions, then mux them into a muxer-fn and use
flags for the actions, eg

onclick="mux(1);"
onclick="mux(2);"

etc.

Perhaps I don't understand your line of thinking, but I am at a loss
as to what /noticeclick?targetid=foo buys you.

As Lelie said, this can easily be done with a custom url handler (note
that calling it will spit out the updated weblocks widget tree in the
output stream).

> that I can call from an onclick="sendToServer(evt)" event, where
> sendToServer() is a JS method which calls to weblocks, weblocks does
> something with the

If you want a static svg, put in onclick="myspecialfn()" where you
need some interaction, then

(defmethod render-widget-body ((widget contains-svg) &rest args)

  (send-script (format nil "function my-special-fn (argv) { /* code
that populates args_hash_js = {key1:foo key2:bar}; */ ; ~A ; } "
                       (make-action-string-with-args
                               (lambda (&key key1 key2)
                                     "lambda can access everything in
the current session, incl. the widget whose render-widget-body this is
in.")
                      :args "args_hash_js" ))
;; any of these:
(with-html (:object (:xml ....)))
(slurp-bar-file "/pub/some.svg)
(template-file "/pub/some.svg" :var1 "foo") )

Depending on how complex you make my-special-fn you can embed all the
various action-options into it, similar to muxer-fn above.

> information, and based on the result we might need to update a few
> attributes in the SVG too.

afaik, this is impossible with a static svg, right?

this is easy to do if your svg is embedded inside a render-widget-body
(even allowing for large static chunks of it to be pulled in through
templates/format strings etc). html-template is probably more
efficient than format.

> The right thing(tm) would maybe be to have the SVG delivered
> dynamically, with a JS-variable
> containing the session-specific url destination for the above being
> templated in at that time.

Absolutely. Especially if you want the SVG to change based on the
input. The rough-cut above addresses exactly this scenario, if I'm not
mistaken.

I still don't get the need for "the session-specific url destination"
though :-P

> However,
> I still don't see how to tweak that into Leslie's suggested
> hunchentoot-prefix handler.

nope, still don't get it. perhaps you could restate the case for this?
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