1// Cursor coordinate functions
2var myX, myY, xyOn, myMouseX, myMouseY;
3xyOn = true;
4
5function getXYPosition(e) {
6    myMouseX = (e || event).clientX;
7    myMouseY = (e || event).clientY;
8    if (document.documentElement.scrollTop > 0) {
9        myMouseY = myMouseY + document.documentElement.scrollTop;
10    }
11    if (xyOn) {
12        alert("X is " + myMouseX + "\nY is " + myMouseY);
13    }
14}
15function toggleXY() {
16    xyOn = !xyOn;
17    document.getElementById('xyLink').blur();
18    return false;
19}   
20
21document.onmouseup = getXYPosition;

1<p>Click in the div element below to get the x (horizontal) and y (vertical) coordinates of the mouse pointer, when it is clicked.</p>
2
3<div onclick="showCoords(event)"><p id="demo"></p></div>
4
5<p><strong>Tip:</strong> Try to click different places in the div.</p>
6
7<script>
8function showCoords(event) {
9  var cX = event.clientX;
10  var sX = event.screenX;
11  var cY = event.clientY;
12  var sY = event.screenY;
13  var coords1 = "client - X: " + cX + ", Y coords: " + cY;
14  var coords2 = "screen - X: " + sX + ", Y coords: " + sY;
15  document.getElementById("demo").innerHTML = coords1 + "<br>" + coords2;
16}
17</script>

1(function() {
2    document.onmousemove = handleMouseMove;
3    function handleMouseMove(event) {
4        var eventDoc, doc, body;
5
6        event = event || window.event; // IE-ism
7
8        // If pageX/Y aren't available and clientX/Y are,
9        // calculate pageX/Y - logic taken from jQuery.
10        // (This is to support old IE)
11        if (event.pageX == null && event.clientX != null) {
12            eventDoc = (event.target && event.target.ownerDocument) || document;
13            doc = eventDoc.documentElement;
14            body = eventDoc.body;
15
16            event.pageX = event.clientX +
17              (doc && doc.scrollLeft || body && body.scrollLeft || 0) -
18              (doc && doc.clientLeft || body && body.clientLeft || 0);
19            event.pageY = event.clientY +
20              (doc && doc.scrollTop  || body && body.scrollTop  || 0) -
21              (doc && doc.clientTop  || body && body.clientTop  || 0 );
22        }
23
24        // Use event.pageX / event.pageY here
25    }
26})();
27