The KeyboardEvent.location read-only property returns an unsigned long representing the location of the key on the keyboard or other input device.
Possible values are: The key was on the numeric keypad, or has a virtual key code that corresponds to the numeric keypad. Note: When NumLock is locked, Firefox always returns Note: NumLock key's key events indicate The key was on a mobile device; this can be on either a physical keypad or a virtual keyboard. The key was a button on a game controller or a joystick on a mobile device.Constant Value Description DOM_KEY_LOCATION_STANDARD0 The key has only one version, or can't be distinguished between the left and right versions of the key, and was not pressed on the numeric keypad or a key that is considered to be part of the keypad. DOM_KEY_LOCATION_LEFT1 The key was the left-hand version of the key; for example, the left-hand Control key was pressed on a standard 101 key US keyboard. This value is only used for keys that have more than one possible location on the keyboard. DOM_KEY_LOCATION_RIGHT2 The key was the right-hand version of the key; for example, the right-hand Control key is pressed on a standard 101 key US keyboard. This value is only used for keys that have more than one possible location on the keyboard. DOM_KEY_LOCATION_NUMPAD3 DOM_KEY_LOCATION_NUMPAD for the keys on the numeric pad. Otherwise, when NumLock is unlocked and the keyboard actually has a numeric keypad, Firefox always returns DOM_KEY_LOCATION_NUMPAD too. On the other hand, if the keyboard doesn't have a keypad, such as on a notebook computer, some keys become Numpad only when NumLock is locked. When such keys fires key events, the location attribute value depends on the key. That is, it must not be DOM_KEY_LOCATION_NUMPAD.DOM_KEY_LOCATION_STANDARD both on Firefox and Internet Explorer.DOM_KEY_LOCATION_MOBILE 4 DOM_KEY_LOCATION_JOYSTICK 5
A number.
function keyEvent(event) {
console.log(`Location of key pressed: ${event.location}`);
}