如何解码从jQuery的keydown（）的事件处理程序的字符 [英] How to decode character pressed from jQuery's keydown()'s event handler

问题描述

我需要弄清楚从jQuery的 keydown 函数调用的处理程序中输入的文本字段中输入了哪个字符。 key.which 只给我keycode，但我需要弄清楚哪个ASCII字符 key 表示。

I need to figure out which character was typed into a text field from within the handler that is called by jQuery's keydown function. key.which gives me only the keycode, but I need to figure out which ASCII character key represents. How do I do this?

推荐答案

对于字符输入，建议您使用 keypress / code>，它将报告按下的字符的实际ASCII代码。它自动处理大写字母，忽略非字符印刷。在任一情况下，您都可以使用fromCharCode（）转换为字符串表示形式。例如

For character input, it is suggested you use keypress(), which will report the actual ASCII code for the character pressed. It automatically takes care of letter case, and ignores non-character presses. In either case, you can use fromCharCode() to convert to a string representation. E.g.

var c = String.fromCharCode(e.which) // or e.keyCode

请记住， keydown（）和 ），您必须使用 e.shiftKey 状态跟踪案例。

Just remember that for keydown() and keyup(), you'll have to keep track of the case using the e.shiftKey state.

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