Consider the code below. This code returns the absolute position of the mouse when hovering over the div tag.
<!DOCTYPE html>
<html>
<head>
<style>
div {
width: 200px;
height: 100px;
border: 1px solid black;
}
</style>
</head>
<body>
<p>This example demonstrates how to assign an "onmousemove" event to a div element.</p>
<div onmousemove="myFunction(event)"></div>
<p>Mouse over the rectangle above, and get the coordinates of your mouse pointer.</p>
<p id="demo"></p>
<script>
function myFunction(e) {
var x = e.clientX;
var y = e.clientY;
var coor = "Coordinates: (" + x + "," + y + ")";
document.getElementById("demo").innerHTML = coor;
}
</script>
</body>
</html>
Now, I'd like to use div.offsetLeft inside the function in order to calculate the relative mouse position. The problem is, if I try doing something like:
<script>
function myFunction(e) {
var x = e.clientX - this.offsetLeft;
var y = e.clientY - this.offsetHeight;
var coor = "Coordinates: (" + x + "," + y + ")";
document.getElementById("demo").innerHTML = coor;
}
</script>
I get an error. The this is not referencing the div tag, but something else... Any ideas on how to solve this?