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Re: [whatwg] Exceptions in UndoManager

From: Alex Vincent <ajvincent@gmail.com>
Date: Wed, 30 May 2012 08:15:08 -0700
Message-ID: <CAEZ8440HjALxhwGeWXjzyWAGr6Vvm2T0cU6VFjynkoieA8X9XQ@mail.gmail.com>
To: Ryosuke Niwa <rniwa@webkit.org>
Cc: whatwg@whatwg.org, Ojan Vafai <ojan@chromium.org>, Jonas Sicking <jonas@sicking.cc>, Olli Pettay <Olli.Pettay@helsinki.fi>, Ehsan Akhgari <ehsan@mozilla.com>
My first concern is "what state will the UndoManager be in when an
exception happens?"  There may be transactions that were undone, cropped
off


On Wed, May 30, 2012 at 12:03 AM, Ryosuke Niwa <rniwa@webkit.org> wrote:

> When an exception is thrown within transact(), the most sane behavior
> appears to be rolling back all DOM changes that have made thus far (this in
> turn may also fail due to mutation events, etc...). Also this is not
> possible with manual transactions because browsers don't keep track of
> what's happening in the DOM, etc...
>
> So how about just firing an event like DOMTransactionException at the undo
> scope host to let scripts handle them?
>

-- 
"The first step in confirming there is a bug in someone else's work is
confirming there are no bugs in your own."
-- Alexander J. Vincent, June 30, 2001
Received on Wednesday, 30 May 2012 15:15:42 GMT

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