Hello, sorry for the delay to reply due to national holiday of Japan.
As far as I know, Gecko doesn't dispatch keydown nor keyup event for IME
unaware applications because JS changes something at keydown or keyup
event handler causes forcibly committing composition that may have
caused IME unavailable on such web pages.
For the compatibility between other browsers, I agree with changing
Gecko's behavior.
However, there is an important thing is, which key value is proper value
for keyboard events during composition. For example, in Kana input mode
of Japanese IME, ASCII characters vs. Kana characters. Due to the
platform limitations, browsers cannot retrieve what character *will* be
inputted into the composition string.
At a meeting of UI Events (or D3E Events), we discussed this issue.
IIRC, at that time, we didn't find any proper value but browsers should
*not* dispatch keyboard events during composition (but allowing it for
backward compatibility for non-Gecko browsers, therefore, currently
defined with MAY).
I believe that web authors shouldn't handle keyboard events for text
input. I.e., shouldn't need keyboard events during composition because
such applications cannot support handwriting system and/or speech input
system. At least spec should recommend web authors should handle
"compositionupdate", "beforeinput" and/or "input". Handling
keydown/keyup event during composition means that a keydown/keyup event
causes double action (default action, i.e., modifying composition string
and web app specific action).
On 2016/01/10 11:17, Olli Pettay wrote:
On 01/10/2016 01:16 AM, Ryosuke Niwa wrote:
Hi all,
This is another feedback from multiple browser vendors (Apple, Google,
Microsoft) that got together in Redmond last Thursday to discuss
editing API and related events.
We've been informed that Gecko/Firefox does not fire keydown/keyup
events during input method composition for each key stroke. Could
someone from Mozilla clarify why this is desirable behavior?
We think it's better to fire keydown/keyup events for consistency
across browsers. If anything authors can detect that a given
keydown/keyup event is associated with input methods by listening to
composition events as well.
- R. Niwa
Masayuki should clarify this, but as far as I know, this case depends on
the IME software one is using, and nothing guarantees browser
gets any sane key events.
-Olli
--
Masayuki Nakano <masay...@d-toybox.com>
Manager, Internationalization, Mozilla Japan.
