是否可以通过用户脚本Jquery识别所有键码事件 [英] Can all keycode events be recognized by a user-script Jquery

问题描述

我正在使用 Tampermonkey 构建一个用于识别键码事件的用户脚本，当键被触发时，它将执行一项功能。

I am building a userscript with Tampermonkey that recognizes keycode events and when the key is fired it will do a function.

例如。我想按 Enter ，其键码为13，所以我使用了这段代码

for eg. I want to press Enter and its keycode is 13 so I used this code

$(document).keypress(function(event){
var which = (event.which ? event.which : event.keyCode);
if(which == '13'){
    alert("You Pressed Enter key");
}
else if(which == '17'){
    alert("You Pressed Control key");
}
});

代码与 Enter 并且 1 但不能与 Ctrl 或 Shift 和其他键一起使用。

The code works fine with Enter and with 1 but doesn't work with Ctrl nor Shift and other keys.

我有什么事吗丢失或不是所有关键事件都可以处理？

Is there any thing I am missing or not all key events can be handled?

注意：我一直在使用此链接获取我的密钥代码并在我的脚本中使用它们。

NOTE : I have been using this link to get my keycodes and using them in my script.

推荐答案

keypress 未触发控制键。根据Mozilla文档的说明：

keypress isn't triggered for control key. Per the description on Mozilla docs:

键时触发 keypress 事件按下会产生一个字符值。产生字符值的键的示例是字母，数字和标点符号键。不产生字符值的键的示例是修饰键，例如 Alt ， Shift ， Ctrl 或 Meta 。

The keypress event is fired when a key that produces a character value is pressed down. Examples of keys that produce a character value are alphabetic, numeric, and punctuation keys. Examples of keys that don't produce a character value are modifier keys such as Alt, Shift, Ctrl, or Meta.

一种方法是收听 keydown 或 keyup 事件：

One way to get around is to listen to keydown or keyup event:

$(document).keydown(function(event) {
  var which = (event.which ? event.which : event.keyCode);
  if (which == '13') {
    alert("You Pressed Enter key");
  } else if (which == '17') {
    alert("You Pressed Control key");
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

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