我希望每t毫秒定期跟踪一次鼠标光标的位置。因此,从本质上讲,当页面加载时-该跟踪器应该启动,并且每(例如)每100毫秒启动一次,我应该获取posX和posY的新值并以表格形式打印出来。
我尝试了以下代码-但没有刷新值-表单框中仅显示posX和posY的初始值。关于如何启动和运行它的任何想法?
<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>
event
在mousemove
事件处理程序接收到的对象上报告鼠标的位置,您可以将其附加到窗口(事件冒泡):
(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
}
})();
(请注意,它的主体if
只能在旧版IE上运行。)
以上示例的实际操作-在将鼠标拖动到页面上方时会绘制点。(在IE8,IE11,Firefox 30,Chrome 38上测试。)
如果您确实需要基于计时器的解决方案,请将其与一些状态变量结合使用:
(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
}
}
})();
据我所知,如果没有看到事件,就无法获得鼠标的位置,对此另一个堆栈溢出问题的回答似乎可以证实这一点。
旁注:如果您打算每100毫秒(10次/秒)执行某项操作,请尝试使该功能中执行的实际处理非常非常有限。对于浏览器,这是很多工作,尤其是较旧的Microsoft。是的,在现代计算机上看起来不多,但是浏览器中发生了很多事情。因此,例如,您可以跟踪最后处理的位置,如果位置不正确,则可以立即从处理程序中保释。改变了。
这是一个基于jQuery和主体上的鼠标事件侦听器(比常规轮询要好得多)的解决方案:
$("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)}
打开控制台(Ctrl+ Shift+ J),复制粘贴上面的代码,然后在浏览器窗口上移动鼠标。
我相信我们对此有过多的思考,
function mouse_position(e)
{
//do stuff
}
<body onmousemove="mouse_position(event)"></body>
我认为他只想知道光标的X / Y位置,而不是答案那么复杂。
// 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>
基于ES6的代码:
let handleMousemove = (event) => {
console.log(`mouse position: ${event.x}:${event.y}`);
};
document.addEventListener('mousemove', handleMousemove);
如果您需要通过限制来移动鼠标,请使用以下命令:
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));
这是例子
如果只想直观地跟踪鼠标移动:
<!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>
不管使用哪种浏览器,下面几行对我来说都是正确的,以获取正确的鼠标位置。
event.clientX - event.currentTarget.getBoundingClientRect().left
event.clientY - event.currentTarget.getBoundingClientRect().top
我没有足够的声誉来发表评论,但我接受了TJ Crowder的出色回答,并在100ms计时器上完全定义了代码。(他留下了一些想像的细节。)
感谢OP的问题,TJ的回答!你们俩都是很大的帮助。代码作为isbin的镜像嵌入在下面。
<!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>
只是@TJ Crowder和@RegarBoy的答案的简化版本。
我认为少即是多。
查看onmousemove事件以获取有关该事件的更多信息。
有一个新的价值posX
,并posY
每次都根据横向和纵向坐标中的鼠标移动。
<!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>
这是两个要求的组合:每100毫秒跟踪一次鼠标位置:
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);
}
这种轨道和鼠标位置行为,但只有每一个时期毫秒。
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