> tell application "Safari"
> do JavaScript "document.title = 'hello'; return 1" in tab 1 of
> window 1
> end tell
>
> Window title changes as expected; still no return value though, so
> 'do JavaScript' is definitely broken. Feel free to file your own bug
> report on it; this is something that should've been caught by basic
> unit testing well before public beta.
I think this use of "return" is "invalid". "return" must be used
inside a
function (?)
You may be on to something. I tried running:
tell application "Safari"
do JavaScript "42" in document 1
end tell
--> 42
As you can see, it gives a result. Looks like something in the
JavaScript interpreter has changed from previous versions, as "return
1" works fine in the version of JS used by Safari 2. Unfortunately,
I'm not a JS expert (as you can tell) so I've no idea if this is by
design or accident - anyone know?
Seems that 3b now coerces results (if possible).
I don't know about coercing results, but it does seem to have
improved the mapping between JS and AS types, e.g. JS numbers now
return as AS numbers instead of strings.
Anyway, after all that there is absolutely definitely a bug in 'do
JavaScript', although it's not the one I initially thought. The bug
is that 'do JavaScript' should always return a result, even if that
result is only 'missing value', but sometimes fails to do so. It's
not the first application to do this, e.g. older versions of Address
Book were notorious for this, and I suspect it's really something
that should be addressed at the Cocoa Scripting framework level when
mapping Cocoa objects to their AEDesc equivalents.
It shouldn't, I think. And
if it does, it should also throw AS-errors when the do JavaScript
call does
so... (for example, appart from the DOM and appart from lots of
missing
functions in Safari and, more generally, in most of browsers).
I've never understood JS's approach to exceptions and exception
handling, so ain't going there myself. :p
Anyways, many thanks for helping to get to the bottom of the problem,
and I'll be sure to pass the info on.
