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JavaScript DOM MouseEvent property: relatedTarget

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The relatedTarget property of MouseEvent objects within the JavaScript DOM (i.e. events triggered by an action with the mouse) returns the element related to the element that triggered the mouse event.

 

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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