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Javascript - Track mouse position

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谎友^
谎友^ 2020-11-22 03:13

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 m

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  • 南旧
    2020-11-22 04:02 
    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.

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  • 忘掉有多难
    2020-11-22 04:03

    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

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  • 盖世英雄少女心
    2020-11-22 04:06

    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>

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  • 滥情空心
    2020-11-22 04:08

    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>

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  • 佛祖请我去吃肉
    2020-11-22 04:09

    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

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