448591 - menu's appendItem sets menuitem attributes, not properties

Status: RESOLVED DUPLICATE of bug 250123

(Core :: XUL, defect)

Description

[Dan Mills [:thunder]]

I have a menu to which I'm adding some items with appendItem:

let menu = document.getElementById("sync-tabs-menu");
let menuitem = menu.appendItem(label, virtualTab.id);

At this point, menuitem.label and menuitem.value are both undefined (both label and virtualTab.id are defined).  However, menuitem.getAttribute("label") and menuitem.getAttribute("value") both work as expected.

I poked around in toolkit/content/widgets/menu.xml and friends, I see that appendItem (insertItemAt, actually) will just set the attribute.  I also see that the inherited properties for value/label *should* be pulling the values out of the attribute.

So unfortunately I don't know how to explain why it doesn't work.  I've also attempted to wait for a bit after creation to poke the properties (several seconds), but that doesn't seem to help.  So it's not some sort of late/asynchronous binding problem IMO.

Comment 1

[Stefan [:stefanh]]

Same issue as bug 250123?

Comment 2

[Dan Mills [:thunder]]

Quite possibly.  In my case I wasn't using a listbox (I used a menu instead), but like in bug 250123 the items in my menu were not visible.  I was building up a menu without showing it.

Marking as a dupe.