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Re: [whatwg] Proposal: Add window.getLastError (or modify invocation arguments of window.onerror)

From: James Greene <james.m.greene@gmail.com>
Date: Fri, 12 Jul 2013 13:30:43 -0500
Message-ID: <CALrbKZhZ0fsdDOoFLz-tJ=v=cwZLcOo-79Bo9aXVJk5WgG=5Xw@mail.gmail.com>
To: Simon Pieters <simonp@opera.com>
Cc: Oliver Hunt <oliver@apple.com>, whatwg@lists.whatwg.org, Elliott Sprehn <esprehn@chromium.org>, Garrett Smith <dhtmlkitchen@gmail.com>, nathan.f77@gmail.com
I'd rather get an Error-like duck-typed object with this shell info for
cross-domain requests than to not get a real Error object when the
unhandled error *is* from the same origin.

Adding the trace as another new argument to `window.onerror` is certainly
an option but the parameter list is getting long and I suspect that Error
prototypes may still gain additional properties in the future.  Continuing
down this path of adding more parameters rather than just passing an Error
instance or Error-like object (or providing a separate supplemental method
like `window.getLastError()` seems like one of those decisions that might
results in infinite sadness in the future.

    James Greene

On Mon, Mar 11, 2013 at 5:50 AM, Simon Pieters <simonp@opera.com> wrote:

> On Tue, 05 Feb 2013 08:20:27 +0100, Elliott Sprehn <esprehn@chromium.org>
> wrote:
>  On Mon, Feb 4, 2013 at 5:44 PM, Oliver Hunt <oliver@apple.com> wrote:
>>  ...
>>> That's tricky - what is your "stack trace"?  You can very easily end up
>>> leaking private information across frames.
>>>  window.onerror is triggered across non-same origin frames?
> Yes, but always with these arguments:
> "Script error.", "", 0, 0
> --
> Simon Pieters
> Opera Software
Received on Friday, 12 July 2013 18:31:28 UTC

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