event.which
For key or mouse events, this property indicates the specific key or button that was pressed.
.event.which()🡢 Number
The event.which property normalizes event.keyCode and event.charCode. It is recommended to watch event.which for keyboard key input. For more detail, read about event.charCode on the MDN.
event.which also normalizes button presses (mousedown and mouseupevents), reporting 1 for left button, 2 for middle, and 3 for right. Use event.which instead of event.button.
Log which key was depressed.
JS
<input id="whichkey" value="type something" />
<div id="log"></div>
HTML
$("#whichkey").on("keydown", function (event) {
$("#log").html(event.type + ": " + event.which);
});
DEMO
Log which mouse button was depressed.
JS
<input id="whichkey" value="click here" />
<div id="log"></div>
HTML
$("#whichkey").on("mousedown", function (event) {
$("#log").html(event.type + ": " + event.which);
});
DEMO