Re: ISSUE-137 (IME-keypress): Should keypress events fire when using an IME? [DOM3 Events]

根據三位的意思送出意見了[1]，感謝各位。W3C 郵件群的瀏覽方式我一般都會按
下面的 Contemporary messages sorted: [ by thread ] ，來看整個討論緒。若
是 Hax 前輩有什麼更好的方法就麻煩你說啦。

[1] http://lists.w3.org/Archives/Public/public-webapps/2011JulSep/0898

(11/08/12 14:12), John Hax wrote:
> 我认为这个事情是相当显然的。假设一个游戏捕捉keydown/up/press操作。输入
> 法组字显然和操作游戏的按键是两码事。 所以在输入法组字时触发keydown/up
> /press是很诡异的事情。
>
> 考虑mobile系统就更清楚了，在mobile系统里，输入法几乎就等同于modal
> dialog，所有键盘操作应该是被完全接管的。

有理

> 唯一我们可以接受的是它发出一组特定的键值，例如过去的惯例是keydown 229
> 加上keyup实际按键。

反正目前是說都不要了，應該都是要依賴 copositionstart 之類的。以後如果有
向後兼容的問題在看看吧，這個 229 應該沒寫在任何標準裡吧？

> 其实更加烦人的是value change的问题。见此贴：http://www.cnblogs.com
> /cathsfz/archive/2011/05/29/2062382.html#2145980
>
> 相比发出keypress事件（实际上现在没人这么做），更不能接受的是发出
> input/textinput/change事件。

目前瀏覽器的情形是怎麼樣？


Kenny

> 2011/8/12 Kang-Hao (Kenny) Lu <kennyluck@w3.org <mailto:kennyluck@w3.org>>
>
>     從 Web App 工作組轉來的信，大意是說輸入法在組字的時候不應該觸發鍵
>     盤事件（keydown、keyup 及 keypress）的一些論述，我沒有仔細消化，不
>     過除了 2. 的邏輯看起來很怪應該是對的。
>
>     就算沒有反對意見我們也可以直接說「支持」，大家怎麼想？
>
>     原文的庫存位於[1]，在這個郵件列表上相關的討論還有：
>     * 用輸入法打字時 input.value 被更改的情形[2]
>     * Google Japan 的輸入法 API[3] — 裡面文檔關於 IME 的介紹有圖，還蠻
>     值得看的
>
>     [1] http://lists.w3.org/Archives/Public/public-webapps/2011JulSep/0749
>     [2] http://lists.w3.org/Archives/Public/public-html-ig-zh/2011Feb/0030
>     [3] http://lists.w3.org/Archives/Public/public-html-ig-zh/2011Feb/0021
>
>
>     Kenny
>
>
>
>     -------- Original Message --------
>     Subject:  Re: ISSUE-137 (IME-keypress): Should keypress events
>     fire when using an IME? [DOM3 Events]
>     Resent-Date:  Tue, 09 Aug 2011 08:58:20 +0000
>     Resent-From:  public-webapps@w3.org <mailto:public-webapps@w3.org>
>     Date:  Tue, 09 Aug 2011 17:57:22 +0900
>     From:  Masayuki Nakano <masayuki@d-toybox.com>
>     <mailto:masayuki@d-toybox.com>
>     To:  Web Applications Working Group WG <public-webapps@w3.org>
>     <mailto:public-webapps@w3.org>
>
>
>
>     Hello.
>
>     Currently, Firefox doesn't fire any key events (keydown, keyup and 
>     keypress) during IME composition.  There are some reasons:
>
>     1. Most firefox code handles key events without IME composition state 
>     check. (This is our internal reason, though) Therefore, if we would fire 
>     key events during composition, we would need to fix very many code.
>
>     2. Web application developers cannot check IME composition state 
>     directly.  If they needed to check it, they needed to listen 
>     compositionstart and compositionend events and make a bool variable. 
>     Therefore, if web developers handled key events without IME state check, 
>     IME users couldn't use some web applications.
>
>     3. Some web developers may not know well about IME behavior. Their web 
>     applications might break IME behavior by handling key events.
>
>     I'd like to *suggest* that key events shouldn't be fired during IME 
>     composition, especially for #3.  If web developers want to know the 
>     timing of updating composition string, they can use compositionupdate or 
>     textinput. I think that these events are better for the purpose since 
>     IME composition string can be updated by clicking on candidate window, 
>     i.e., it doesn't cause key events.
>
>     thanks,
>
>     On 2010/10/06 15:16, Web Applications Working Group Issue Tracker wrote:
>     >
>     > ISSUE-137 (IME-keypress): Should keypress events fire when using an IME? [DOM3 Events]
>     >
>     > http://www.w3.org/2008/webapps/track/issues/137
>     >
>     > Raised by: Doug Schepers
>     > On product: DOM3 Events
>     >
>     > Hallvord R. M. Steen<http://lists.w3.org/Archives/Public/www-dom/2010JulSep/0176.html>:
>     > [[
>     > current spec text says about the keypress event:
>     >
>     >> This event type shall be generated after the keyboard mapping
>     >> but before the processing of an input method editor, normally
>     >> associated with the dispatching of a compositionstart, compositionupdate,
>     >> or compositionend event.
>     >
>     > I think this is wrong, if an IME is actively processing the input no
>     > keypress event should fire.
>     > ]]
>
>     -- 
>     Masayuki Nakano <masayuki@d-toybox.com> <mailto:masayuki@d-toybox.com>
>     Manager, Internationalization, Mozilla Japan.
>
>
>