How to find the key code for a specific key

问题

What's the easiest way to find the keycode for a specific key press?

Are there any good online tools that just capture any key event and show the code?

I want to try and find the key codes for special keys on a mobile device with a web browser, so an online tool would be great.

回答1:

    $(function () {
      $(document).keyup(function (e) {
         console.log(e.keyCode);
      });
    });

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

Here's your online tool.

回答2:

Just googled and result

function displayunicode(e) {
  var unicode = e.keyCode ? e.keyCode : e.charCode;
  console.log(unicode);
}

<form>
  <input type="text" size="2" maxlength="1" onkeyup="displayunicode(event); this.select()" />
</form>

回答3:

As in, what keyboard events reports based on what keys are pressed

  $("#textinput").keydown(function(e) {
    e.keyCode; // this value
  });

Try Here for all the key Events and These are the mobile key Events

回答4:

The bottom of http://www.quirksmode.org/js/keys.html can show the keycode of keys you have pressed for the selected keyboard events.

回答5:

Try this:

$('#myelement').keydown(function(event) {
  var code = event.keyCode;
  alert(code);
}

回答6:

Try not to hard-code too many keycodes. Let the JS library convert them for you wherever possible:

var code = ev.keyCode,
    ascii = String.fromCharCode(code);
alert(ascii);

回答7:

Please try this.

$('input').on('keyup', function(e){
   var key_code = e.which || e.keyCode;
   console.log(key_code );
});

For better help please follow the below link http://www.w3schools.com/jsref/event_key_keycode.asp

回答8:

If you are only looking for keyCode you essentially don't need to get the keypress event, you can simply convert character to keyCode and vise versa:

Char to KeyCode, for instance A ("A").charCodeAt(0) returns 65. Here's the syntax.

If you already know the characters which their keycodes are needed, say 'ABCDEFGH', you only need a loop to get all key codes:

var text = "ABCDEFGH";
for (var i=0; i< text.length; i++){
	console.log(text[i] ,text.charCodeAt(i))
}

It's obvious that this method is not going to be used for obtaining key codes of shif, ctrl or Alt key in keyboard, if you need them stick with the method stated above which uses keypress event.

FYI, to convert keyCode to Char: String.fromCharCode(65) returns A.

回答9:

Vanilla javascript + Alert:

document.addEventListener('keypress', function(e) {
  alert("Key: " + e.code + ", Code: " + e.charCode)
});

Vanilla javascript + console:

document.addEventListener('keypress', function(e) {
  console.log("Key: " + e.code + ", Code: " + e.charCode)
});

来源：https://stackoverflow.com/questions/4054801/how-to-find-the-key-code-for-a-specific-key

标签

javascript

jquery

events

keyboard

keyboard-events