Mark,

Thank you for the reply!

Given that you're not familiar enough with these specific elements,
where would *you* go to figure out which interfaces are implemented by
my surface object (it's a <browser>  XUL element) and do you have a
snippet of code that exemplifies the retrieval of an object (via
getElementById(), and the application of that interface so that the
goBack() method can be called?

Cheers!

-R

On 8/10/07, Mark Hammond <mhammond@[...].au>  wrote:
>  >                                       <button label="Back"
>  > oncommand="document.getElementById('surface').goBack()" />
>  >                                       </tabpanel>
>  ...
>  >
>  > A click on the button returns the following message to my
>  > error console:
>  >
>  > WARNING:xpcom:Python DOM script error
>  > Traceback (most recent call last):
>  >   File
>  > "C:\mozilla-src-vc71\mozilla\obj-i686-pc-mingw32\dist\bin\pyth
>  > on\nsdom\context.py",
>  > line 478, in CallEventHandler
>  >     return handler(*args)
>  >   File "chrome://main/content/main.xul", line 1, in oncommand
>  >   File
>  > "C:\mozilla-src-vc71\mozilla\obj-i686-pc-mingw32\dist\bin\pyth
>  > on\nsdom\context.py",
>  > line 144, in __getattr__
>  >     return Component.__getattr__(self, attr)
>  >   File
>  > "C:\mozilla-src-vc71\mozilla\obj-i686-pc-mingw32\dist\bin\pyth
>  > on\xpcom\client\__init__.py",
>  > line 384, in __getattr__
>  >     raise AttributeError, "XPCOM component '%s' has no attribute '%s'"
>  > % (self._object_name_, attr)
>  > <type 'exceptions.AttributeError'>: XPCOM component
>  > '<unknown>' has no attribute 'goBack'
> 
>  The problem is that the result of getElementById('surface') is not what you
>  expect.  You need to work out which interface implements the goBack()
>  method, and then work out if surface is supposed to implement it (in which
>  case you may need an explicit QueryInterface), or if it really is some other
>  object implementing it (such as the window or similar).  I'm afraid that I'm
>  not familiar enough with these specific objects to know without looking
>  though...
> 
>  Mark
> 
> 


-- 
"Time is an illusion.  Lunchtime, doubly so."

Ryan Sturmer
ryansturmer@[...].com
http://www.gogglemarks.net/
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