KeyboardEvent.which

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Syntax
Example
Specifications
Browser compatibility
See also

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Deprecated
This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The KeyboardEvent.which read-only property returns the numeric keyCode of the key pressed, or the character code (charCode) for an alphanumeric key pressed.

Syntax

var keyResult = event.which;

keyResult contains the numeric code for a particular key pressed, depending on whether an alphanumeric or non-alphanumeric key was pressed. Please see KeyboardEvent.charCode and KeyboardEvent.keyCode for more details.

Example

<html>
<head>
<title>charCode/keyCode/which example</title>

<script type="text/javascript">

function showKeyPress(evt)
{
alert("onkeypress handler: \n"
      + "keyCode property: " + evt.keyCode + "\n"
      + "which property: " + evt.which + "\n"
      + "charCode property: " + evt.charCode + "\n"
      + "Character Key Pressed: "
      + String.fromCharCode(evt.charCode) + "\n"
     );
}


function keyDown(evt)
{
alert("onkeydown handler: \n"
      + "keyCode property: " + evt.keyCode + "\n"
      + "which property: " + evt.which + "\n"
     );
}


</script>
</head>

<body
 onkeypress="showKeyPress(event);"
 onkeydown="keyDown(event);"
>

<p>Please press any key.</p>

</body>
</html>

Specifications

Specification	Status	Comment
Document Object Model (DOM) Level 3 Events Specification The definition of 'KeyboardEvent.which' in that specification.	Obsolete	Initial definition; specified as deprecated

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support DeprecatedNon-standard	Chrome Full support 4	Edge Full support Yes	Firefox Full support 2 Notes Full support 2 Notes Notes Firefox also implements this property on the `UIEvent` interface.	IE Full support 9	Opera Full support 10.1	Safari Full support 5.1	WebView Android Full support Yes	Chrome Android Full support Yes	Edge Mobile Full support Yes	Firefox Android Full support Yes Notes Full support Yes Notes Notes Firefox also implements this property on the `UIEvent` interface.	Opera Android ?	Safari iOS Full support 5.1	Samsung Internet Android ?

Legend

Full support: Full support
Compatibility unknown: Compatibility unknown
Non-standard. Expect poor cross-browser support.: Non-standard. Expect poor cross-browser support.
Deprecated. Not for use in new websites.: Deprecated. Not for use in new websites.
See implementation notes.: See implementation notes.

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此页面的贡献者： fscholz, julienw, libbymc, jwhitlock, cvrebert, teoli, SphinxKnight, kscarfone, Kartik_Chadha, Sheppy, Huan, Matej Lednar, Nickolay, Jabez

最后编辑者: fscholz, Apr 20, 2018, 1:35:48 AM