631125 - Report strict errors for runtime exceptions from event listeners

Status: RESOLVED DUPLICATE of bug 503244

(Core :: XPConnect, defect)

Description

[Ed Lee :Mardak]

It seems like exceptions from some addEventListener-listeners are eaten. This is unfortunate for strict mode where one feature is to convert mistakes into errors, e.g., ReferenceError, but the exception doesn't make it to the Error Console.

In particular, I run into this when listening for "TabSelect" on a tab and "command" on a xul:textbox.

("keydown" on the xul:textbox will correctly report "Error: uncaught exception: ReferenceError: assignment to undeclared variable foo")

Comment 1

[Ben Turner (not reading bugmail, use the needinfo flag!)]

We have the ability to detect exceptions thrown from listeners now, too. Look for NS_EVENT_FLAG_EXCEPTION_THROWN.

Comment 2

[Oleg Torbasow]

This does not report error in my case:

li.addEventListener("DOMAttrModified", function(){
	xxx.yyy();//xxx===undefined
	…
}