Javascript - Track mouse position


I am hoping to track the position of the mouse cursor, periodically every t mseconds. So essentially, when a page loads - this tracker should start and for (say) every 100 ms, I should get the new value of posX and posY and print it out in the form.

I tried the following code - but the values do not get refreshed - only the initial values of posX and posY show up in the form boxes. Any ideas on how I can get this up and running ?

<html>
<head>
<title> Track Mouse </title>
<script type="text/javascript">
function mouse_position()
{
    var e = window.event;

    var posX = e.clientX;
    var posY = e.clientY;

    document.Form1.posx.value = posX;
    document.Form1.posy.value = posY;

    var t = setTimeout(mouse_position,100);

}
</script>

</head>

<body onload="mouse_position()">
<form name="Form1">
POSX: <input type="text" name="posx"><br>
POSY: <input type="text" name="posy"><br>
</form>
</body>
</html>

The mouse's position is reported on the event object received by a handler for the mousemove event, which you can attach to the window (the event bubbles):

(function() {
    document.onmousemove = handleMouseMove;
    function handleMouseMove(event) {
        var eventDoc, doc, body;

        event = event || window.event; // IE-ism

        // If pageX/Y aren't available and clientX/Y are,
        // calculate pageX/Y - logic taken from jQuery.
        // (This is to support old IE)
        if (event.pageX == null && event.clientX != null) {
            eventDoc = (event.target && event.target.ownerDocument) || document;
            doc = eventDoc.documentElement;
            body = eventDoc.body;

            event.pageX = event.clientX +
              (doc && doc.scrollLeft || body && body.scrollLeft || 0) -
              (doc && doc.clientLeft || body && body.clientLeft || 0);
            event.pageY = event.clientY +
              (doc && doc.scrollTop  || body && body.scrollTop  || 0) -
              (doc && doc.clientTop  || body && body.clientTop  || 0 );
        }

        // Use event.pageX / event.pageY here
    }
})();

(Note that the body of that if will only run on old IE.)

Example of the above in action - it draws dots as you drag your mouse over the page. (Tested on IE8, IE11, Firefox 30, Chrome 38.)

If you really need a timer-based solution, you combine this with some state variables:

(function() {
    var mousePos;

    document.onmousemove = handleMouseMove;
    setInterval(getMousePosition, 100); // setInterval repeats every X ms

    function handleMouseMove(event) {
        var dot, eventDoc, doc, body, pageX, pageY;

        event = event || window.event; // IE-ism

        // If pageX/Y aren't available and clientX/Y are,
        // calculate pageX/Y - logic taken from jQuery.
        // (This is to support old IE)
        if (event.pageX == null && event.clientX != null) {
            eventDoc = (event.target && event.target.ownerDocument) || document;
            doc = eventDoc.documentElement;
            body = eventDoc.body;

            event.pageX = event.clientX +
              (doc && doc.scrollLeft || body && body.scrollLeft || 0) -
              (doc && doc.clientLeft || body && body.clientLeft || 0);
            event.pageY = event.clientY +
              (doc && doc.scrollTop  || body && body.scrollTop  || 0) -
              (doc && doc.clientTop  || body && body.clientTop  || 0 );
        }

        mousePos = {
            x: event.pageX,
            y: event.pageY
        };
    }
    function getMousePosition() {
        var pos = mousePos;
        if (!pos) {
            // We haven't seen any movement yet
        }
        else {
            // Use pos.x and pos.y
        }
    }
})();

As far as I'm aware, you can't get the mouse position without having seen an event, something which this answer to another Stack Overflow question seems to confirm.

Side note: If you're going to do something every 100ms (10 times/second), try to keep the actual processing you do in that function very, very limited. That's a lot of work for the browser, particularly older Microsoft ones. Yes, on modern computers it doesn't seem like much, but there is a lot going on in browsers... So for example, you might keep track of the last position you processed and bail from the handler immediately if the position hasn't changed.


Here's a solution, based on jQuery and a mouse event listener (which is far better than a regular polling) on the body:

$("body").mousemove(function(e) {
    document.Form1.posx.value = e.pageX;
    document.Form1.posy.value = e.pageY;
})

onmousemove = function(e){console.log("mouse location:", e.clientX, e.clientY)}

Open your console (Ctrl+Shift+J), copy-paste the code above and move your mouse on browser window.


I believe that we are overthinking this,

function mouse_position(e)
{
//do stuff
}
<body onmousemove="mouse_position(event)"></body>


What I think that he only wants to know the X/Y positions of cursor than why answer is that complicated.

// Getting 'Info' div in js hands
var info = document.getElementById('info');

// Creating function that will tell the position of cursor
// PageX and PageY will getting position values and show them in P
function tellPos(p){
  info.innerHTML = 'Position X : ' + p.pageX + '<br />Position Y : ' + p.pageY;
}
addEventListener('mousemove', tellPos, false);
* {
  padding: 0:
  margin: 0;
  /*transition: 0.2s all ease;*/
  }
#info {
  position: absolute;
  top: 10px;
  right: 10px;
  background-color: black;
  color: white;
  padding: 25px 50px;
}
<!DOCTYPE html>
<html>
  
  <body>
    <div id='info'></div>
        </body>
  </html>


ES6 based code:

let handleMousemove = (event) => {
  console.log(`mouse position: ${event.x}:${event.y}`);
};

document.addEventListener('mousemove', handleMousemove);

If you need throttling for mousemoving, use this:

let handleMousemove = (event) => {
  console.warn(`${event.x}:${event.y}\n`);
};

let throttle = (func, delay) => {
  let prev = Date.now() - delay;
  return (...args) => {
    let current = Date.now();
    if (current - prev >= delay) {
      prev = current;
      func.apply(null, args);
    }
  }
};

// let's handle mousemoving every 500ms only
document.addEventListener('mousemove', throttle(handleMousemove, 500));

here is example


Irrespective of the browser, below lines worked for me to fetch correct mouse position.

event.clientX - event.currentTarget.getBoundingClientRect().left event.clientY - event.currentTarget.getBoundingClientRect().top


If just want to track the mouse movement visually:

<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<style type="text/css">
* { margin: 0; padding: 0; }
html, body { width: 100%; height: 100%; overflow: hidden; }
</style>
<body>
<canvas></canvas>

<script type="text/javascript">
var
canvas    = document.querySelector('canvas'),
ctx       = canvas.getContext('2d'),
beginPath = false;

canvas.width  = window.innerWidth;
canvas.height = window.innerHeight;

document.body.addEventListener('mousemove', function (event) {
	var x = event.clientX, y = event.clientY;

	if (beginPath) {
		ctx.lineTo(x, y);
		ctx.stroke();
	} else {
		ctx.beginPath();
		ctx.moveTo(x, y);
		beginPath = true;
	}
}, false);
</script>
</body>
</html>


Here’s a combination of the two requirements: track the mouse position, every 100 milliseconds:

var period = 100,
    tracking;

window.addEventListener("mousemove", function(e) {
    if (!tracking) {
        return;
    }

    console.log("mouse location:", e.clientX, e.clientY)
    schedule();
});

schedule();

function schedule() {
    tracking = false;

    setTimeout(function() {
        tracking = true;
    }, period);
}

This tracks & acts on the mouse position, but only every period milliseconds.


I don't have enough reputation to post a comment reply, but took TJ Crowder's excellent answer and fully defined the code on a 100ms timer. (He left some details to the imagination.)

Thanks OP for the question, and TJ for the answer! You're both a great help. Code is embedded below as a mirror of isbin.

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Example</title>
  <style>
    body {
      height: 3000px;
    }
    .dot {
      width: 2px;
      height: 2px;
      background-color: black;
      position: absolute;
    }
  </style>
</head>
<body>
<script>
(function() {
    "use strict";
    var mousePos;

    document.onmousemove = handleMouseMove;
    setInterval(getMousePosition, 100); // setInterval repeats every X ms

    function handleMouseMove(event) {
        var eventDoc, doc, body;

        event = event || window.event; // IE-ism

        // If pageX/Y aren't available and clientX/Y are,
        // calculate pageX/Y - logic taken from jQuery.
        // (This is to support old IE)
        if (event.pageX == null && event.clientX != null) {
            eventDoc = (event.target && event.target.ownerDocument) || document;
            doc = eventDoc.documentElement;
            body = eventDoc.body;

            event.pageX = event.clientX +
              (doc && doc.scrollLeft || body && body.scrollLeft || 0) -
              (doc && doc.clientLeft || body && body.clientLeft || 0);
            event.pageY = event.clientY +
              (doc && doc.scrollTop  || body && body.scrollTop  || 0) -
              (doc && doc.clientTop  || body && body.clientTop  || 0 );
        }

        mousePos = {
            x: event.pageX,
            y: event.pageY
        };
    }
    function getMousePosition() {
        var pos = mousePos;
		
        if (!pos) {
            // We haven't seen any movement yet, so don't add a duplicate dot 
        }
        else {
            // Use pos.x and pos.y
            // Add a dot to follow the cursor
            var dot;
            dot = document.createElement('div');
            dot.className = "dot";
            dot.style.left = pos.x + "px";
            dot.style.top = pos.y + "px";
            document.body.appendChild(dot);
        }
    }
})();
</script>
</body>
</html>


Just a simplified version of @T.J. Crowder and @RegarBoy's answers.

Less is more in my opinion.

Check out onmousemove event for more info about the event.

Image mouse tracker

There's a new value of posX and posY every time the mouse moves according to the horizontal and vertical coordinates.

<!DOCTYPE html>
    <html>
    <head>
      <meta charset="utf-8">
      <title>Example Mouse Tracker</title>
      <style>    
        body {height: 3000px;}
        .dot {width: 2px;height: 2px;background-color: black;position: absolute;}
      </style>
    </head>
    <body>
    <p>Mouse tracker</p>
    <script>
    onmousemove = function(e){
        //Logging purposes
        console.log("mouse location:", e.clientX, e.clientY);

        //meat and potatoes of the snippet
        var pos = e;
        var dot;
        dot = document.createElement('div');
        dot.className = "dot";
        dot.style.left = pos.x + "px";
        dot.style.top = pos.y + "px";
        document.body.appendChild(dot);
    }      
    </script>
    </body>
    </html>