244200 - Unable to access attributes/methods on xpconnect wrapped interface

Status: RESOLVED INVALID

(Core :: DOM: Core & HTML, defect)

Description

[Darin Fisher]

Unable to access attributes/methods on xpconnect wrapped interface.

Here's the scenario:

I have a XUL listbox with a bunch of listitem children.  Each listitem's value
property holds a nsIFoo instance.  Later when I try to fetch the nsIFoo
instance, I am unable to access any attributes or methods on the instance.

This is only a problem if I use setAttribute("value", ...) and
getAttribute("value") to set and get the value property.  If I simply use
.value, then there is no problem.

I dump'ed the thing I got back from getAttribute("value") to the console and it
said something like this:

  [xpconnect wrapped nsIFoo @ 0x841bda8]

On IRC, shaver said: "setAttribute probably flattens evilly"

Comment 1

[Boris Zbarsky [:bzbarsky]]

Er... setAttribute by definition sets only strings.  So if you pass something to
it, it'll get toString() called on it and that string passed to the native code.
 That's the correct and expected behavior.

If you're trying to set random properties (not to be confused with attributes!),
then setting .foo is the way to go.

Comment 2

[Mike Shaver (:shaver emeritus)]

Right, right, so you get it converted to the string representation, so when you
print it out you get what you expect.  I was fooled. =/

Comment 3

[Darin Fisher]

marking INVALID.  thanks boris!