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Posted to user@lenya.apache.org by Jörn Nettingsmeier <ne...@apache.org> on 2008/01/02 21:46:03 UTC
xhtml in javascript strings in a element...
hi everyone!
in case anyone's interested, i just came across the following
interesting problem:
in a <script/> section, no other xml elements are allowed. therefore,
the following is invalid xhtml:
(1)
<script type="text/javascript">
var myXhtmlString = "<strong>Yabbadabbadoo!</strong>";
</script>
lenya's editors will rightfully complain when you enter such code.
the problem is, the obvious workaround doesn't work:
(2)
<script type="text/javascript">
var myXhtmlString = "<strong>Yabbadabbadoo!</strong>";
</script>
because whatever processes your string later will not re-convert them
into elements, so you get literal &foo; strings in the output.
when using javascript outside of an XML CMS, the following is good practice:
(3)
<script type="text/javascript">
<![CDATA[
var myXhtmlString = "<strong>Yabbadabbadoo!</strong>";
]]>
</script>
this is correct. but unfortunately, our editors will evaluate the CDATA
section and transform it into (2) when saving. which does not work.
but it's not a bug, because from an XML POV both are syntactically
equivalent :(
my usual last resort (apart from moving javascript into an external file
whenever possible [which means we should really introduce a js
doctype]), was using octal escapes, but these have been deprecated as of
javascript 1.5.
iiuc, the current correct way of weaseling around this problem is
(4)
<script type="text/javascript">
var myXhtmlString = decodeURIComponent(
"%3cstrong%3eYabbadabbadoo!%3c/strong%3e"
);
</script>
where % denotes a hexadecimal character encoding and 3c and 3e are "<"
and ">" respectively.
comments/improvements appreciated.
best,
jörn
--
Jörn Nettingsmeier
"One of my most productive days was throwing away 1000 lines of code."
- Ken Thompson.
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