如何使用 javascript 计时来控制鼠标停止和鼠标移动事件

Posted 2023-02-16

【中文标题】如何使用 javascript 计时来控制鼠标停止和鼠标移动事件

【英文标题】：How can I use javascript timing to control on mouse stop and on mouse move events

【发布时间】：2010-09-18 04:09:10

【问题描述】：

所以我在 aspx 页面上有一个控件（地图）。我想编写一些 javascript 来设置以下内容：

当鼠标停在控件上时 = 一些代码

当鼠标移动时 = 一些代码（但仅当移动时间超过 250 百万秒时）

这可以在停止和移动时触发代码...

function setupmousemovement() 
var map1 = document.getElementById('Map_Panel');
var map = document.getElementById('Map1');
map1.onmousemove = (function() 
    var onmousestop = function() 
            //code to do on stop
    , thread;

    return function() 
        //code to do on mouse move
        clearTimeout(thread);
        thread = setTimeout(onmousestop, 25);
    ;
    )();
;

但我不知道如何在移动代码中引入延迟。我以为我有这个......

function setupmousemovement() 
var map1 = document.getElementById('Map_Panel');
var map = document.getElementById('Map1');
map1.onmousemove = (function() 
    var onmousestop = function() 
            //code to do on stop
            clearTimeout(thread2);
    , thread;

    return function() 
        thread2 = setTimeout("code to do on mouse move", 250);
        clearTimeout(thread);
        thread = setTimeout(onmousestop, 25);
    ;
    )();
;

但它的行为并不像我想象的那样。移动中的“thread2”永远不会被停止清除。我错过了什么？

【参考方案1】：

这是一个棘手的问题。一点点修修补补导致了这个：

function setupmousemovement() 

  var map1 = document.getElementById('Map_Panel');
  map1.onmousemove = (function() 
    var timer,
        timer250,
        onmousestop = function() 

          // code to do on stop

          clearTimeout( timer250 ); // I'm assuming we don't want this to happen if mouse stopped
          timer = null;  // this needs to be falsy next mousemove start
        ;
    return function() 
      if (!timer) 

        // code to do on start

        timer250 = setTimeout(function ()  // you can replace this with whatever

          // code to do when 250 millis have passed

        , 250 );
      
      // we are still moving, or this is our first time here...
      clearTimeout( timer );  // remove active end timer
      timer = setTimeout( onmousestop, 25 );  // delay the stopping action another 25 millis
    ;

  )();

;

您的代码不起作用的原因是鼠标移动时 mousemove 会反复触发，并且您每次都开始新的超时。