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JavaScript DOM MouseEvent property: which

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The which property of MouseEvent objects within the JavaScript DOM (i.e. events triggered by an action with the mouse) returns which mouse button was pressed (its output is more consistent between browsers than the button property).

 

EXAMPLE:


HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head></head>
<body>
Try clicking on this box:
<p style="background-color: yellow; border: 2px solid black; width: 200px; height: 100px;"
  onmousedown="myOnmousedown(event)"><br><br></p>

MouseEvent outcomes are:<br><br>
altKey: <b id="mouse1"></b><br>
button (usually 0 = left, 1 = middle, 2 = right): <b id="mouse2"></b><br>
buttons (usually sum of 1 = left, 2 = right, 4 = middle, 8 = back, 16 = forward): 
  <b id="mouse3"></b><br>
clientX: <b id="mouse4"></b><br>
clientY: <b id="mouse5"></b><br>
ctrlKey: <b id="mouse6"></b><br>
detail: <b id="mouse7"></b><br>
metaKey: <b id="mouse8"></b><br>
pageX: <b id="mouse9"></b><br>
pageY: <b id="mouse10"></b><br>
relatedTarget: <b id="mouse11"></b><br>
screenX: <b id="mouse12"></b><br>
screenY: <b id="mouse13"></b><br>
shiftKey: <b id="mouse14"></b><br>
which: <b id="mouse15"></b><br>

<script>
function myOnmousedown(event) {
  document.getElementById("mouse1").innerHTML = event.altKey;
  document.getElementById("mouse2").innerHTML = event.button;
  document.getElementById("mouse3").innerHTML = event.buttons;
  document.getElementById("mouse4").innerHTML = event.clientX;
  document.getElementById("mouse5").innerHTML = event.clientY;
  document.getElementById("mouse6").innerHTML = event.ctrlKey;
  document.getElementById("mouse7").innerHTML = event.detail;
  document.getElementById("mouse8").innerHTML = event.metaKey;
  document.getElementById("mouse9").innerHTML = event.pageX;
  document.getElementById("mouse10").innerHTML = event.pageY;
  document.getElementById("mouse11").innerHTML = event.relatedTarget;
  document.getElementById("mouse12").innerHTML = event.screenX;
  document.getElementById("mouse13").innerHTML = event.screenY;
  document.getElementById("mouse14").innerHTML = event.shiftKey;
  document.getElementById("mouse15").innerHTML = event.which;
}
</script>

</body>
</html>


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