Javascript DOM MouseEvent screenY Property compare to clientY

Introduction

A demonstration of the differences between clientX and clientY and screenX and screenY:

View in separate window 

<!DOCTYPE html>
<html>
<head>
<style>
div {//from   w w w .  ja va 2 s. co m
  width: 500px;
  height: 300px;
  border: 1px solid black;
  text-align: center;
}
</style>
</head>
<body>
<div onclick="showCoords(event)"><p id="demo"></p></div>

<script>
function showCoords(event) {
  var cX = event.clientX;
  var sX = event.screenX;
  var cY = event.clientY;
  var sY = event.screenY;
  var coords1 = "client - X: " + cX + ", Y coords: " + cY;
  var coords2 = "screen - X: " + sX + ", Y coords: " + sY;
  document.getElementById("demo").innerHTML = coords1 + "<br>" + coords2;
}
</script>

</body>
</html>



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