From e16efaf6603c4da33b74b499e0e1214c46ddf72d Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adam@chlipala.net>
Date: Wed, 17 Jul 2019 14:28:46 -0400
Subject: New JavaScript FFI function 'listen'

---
 doc/manual.tex | 1 +
 1 file changed, 1 insertion(+)

(limited to 'doc/manual.tex')

diff --git a/doc/manual.tex b/doc/manual.tex
index ba53f5d8..62b322ae 100644
--- a/doc/manual.tex
+++ b/doc/manual.tex
@@ -2573,6 +2573,7 @@ It is possible to write JavaScript FFI code that interacts with the functional-r
   \item \cd{sr(v)} and \cd{sb(s, f)}, the ``return'' and ``bind'' monad operators, respectively
   \item \cd{ss(s)}, to produce the signal corresponding to source \cd{s}
   \item \cd{scur(s)}, to get the current value of signal \cd{s}
+  \item \cd{listen(s, f)}, to ask that function \cd{f} be called with the current value of \cd{s}, every time it changes, including immediately upon establishing this listener
   \end{itemize}
 
 \item The behavior of the \cd{<dyn>} pseudo-tag may be mimicked by following the right convention in a piece of HTML source code with a type like $\mt{xbody}$.  Such a piece of source code may be encoded with a JavaScript string.  To insert a dynamic section, include a \cd{<script>} tag whose content is just a call \cd{dyn(pnode, s)}.  The argument \cd{pnode} specifies what the relevant enclosing parent tag is.  Use value \cd{"tr"} when the immediate parent is \cd{<tr>}, use \cd{"table"} when the immediate parent is \cd{<table>}, and use \cd{"span"} otherwise.  The argument \cd{s} is a string-valued signal giving the HTML code to be inserted at this point.  As with the usual \cd{<dyn>} tag, that HTML subtree is automatically updated as the value of \cd{s} changes.
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