KeyboardEvent: altKey property
The KeyboardEvent.altKey
read-only property is a
boolean value that indicates if the alt key (Option or ⌥ on macOS) was pressed (true
) or not (false
) when
the event occurred.
Value
A boolean value.
Examples
html
<!doctype html>
<html lang="en-US">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width" />
<title>altKey example</title>
<script>
function showChar(e) {
alert(
"Key KeyDown: " +
String.fromCharCode(e.charCode) +
"\n" +
"charCode: " +
e.charCode +
"\n" +
"ALT key KeyDown: " +
e.altKey +
"\n",
);
}
</script>
</head>
<body onkeydown="showChar(event);">
<p>
Press any character key, with or without holding down the ALT key.<br />
You can also use the SHIFT key together with the ALT key.
</p>
</body>
</html>
Specifications
Specification |
---|
UI Events # dom-keyboardevent-altkey |
Browser compatibility
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