JavaScript键处理和浏览器兼容性 [英] JavaScript key handling and browser compatibility
问题描述
我正在处理java脚本中的键处理。我已经做了一些研究，我想知道我是否对键处理有正确的理解。
KeyDown / KeyUp事件
IE7 +和Firefox 3.5+支持key down和key up事件我没有检查早期版本的浏览器，但我想他们也支持这些事件。
$ b $
CharCode 键
$ b
charCode值在keypress上可用。大多数键将具有表示实际值的字符码。一些键将不具有与它们相关联的字符码。例如。退格，删除，箭头键。
我可以说，在按键上的charcode会和keycode一样。
strong>活动顺序
- KeyDown
- KeyPress
- KeyUp
这个顺序会因浏览器而异吗？例如我有两个函数。首先绑定到KeyDown事件，第二个绑定到KeyPress事件。调用KeyPress事件意味着KeyDown事件也将被调用，当我只想要其中一个事件工作。
最后，我一直在考虑使用不同的键处理例程取决于版本浏览器。例如：
- 检查浏览器版本
- 根据浏览器版本获取密钥处理例程
-
这将引入额外的代码，但应该简化维护。此外，在将来，当我想为不同的浏览器提供支持时，我可以简单地添加另一个例程，并且不会影响现有的字符处理例程。
到目前为止，我一直在阅读 http://www.quirksmode.org
/help.dottoro.com/ljlkwans.phprel =nofollow noreferrer> onkeydown event ，
onkeypress event ，
keyCode属性，
charCode属性，
which property
I'm working on key handling in java script. I have done some research and I'd like to know whether I have a correct understanding of key handling.
KeyDown/KeyUp Event The key down and key up events are supported by IE7+ and Firefox 3.5+ I didn't check the earlier versions of the browsers, but I guess that they also support these events.
Is it correct to say that each key on the keyboard will always have a keycode.
CharCode
CharCode value is available on the keypress.Majority of the keys will have the charcodes that represent the actual value. Some keys won't have a charcode associated with them. E.g. backspace, delete, arrow keys.
Am I correct to say that on the keypress the charcode will be the same as the keycode?
Order of the events
- KeyDown
- KeyPress
- KeyUp
Does this order differ from browser to browser? For example I have two functions. First is bound to KeyDown event, second is bound to the KeyPress event. Calling a KeyPress event means that the KeyDown event will also be called, when I want only one of these events to work.
Finally I have been considering on using different key handling routines depending on the version browser. For example:
- Check browser version
- Get key handling routine depending on the browser version
This will introduce additional code, but should simplify the maintenance. Also, in the future, when I want to provide a support for a different browser, I can simply add another routine and it won't affect existing character handling routine.
So far I have been reading http://www.quirksmode.org
See the following pages, they will answer your quetions:
onkeydown event, onkeypress event, keyCode property, charCode property, which property
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