如何使用javascript计时来控制鼠标停止和鼠标移动事件

时间:2008-10-20 18:01:37

标签: javascript timeout onmousemove

所以我在aspx页面上有一个控件(一张地图)。我想写一些javascript来onload设置如下:

  1. 当鼠标停在控件上时=某些代码

  2. 当鼠标移动=某些代码时(但仅当移动时间超过250毫秒时)

  3. 这可以在停止然后移动时触发代码......

    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);
        };
        })();
    };
    

    但我无法弄清楚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);
        };
        })();
    };
    

    但它并没有像我想象的那样表现。移动“thread2”永远不会被停止清除。我错过了什么?

1 个答案:

答案 0 :(得分:6)

这是一个棘手的问题。一点点的修补就产生了这个:

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当鼠标移动时,mousemove会反复触发,并且每次都会启动新的超时。