JS 拖动事件 - 爱码网

// by zhangxinxu welcome to visit my personal website http://www.zhangxinxu.com/
// zxx.drag v1.0 2010-03-23 元素的拖拽实现

var params = {
    left: 0,
    top: 0,
    currentX: 0,
    currentY: 0,
    flag: false
};
//获取相关CSS属性
var getCss = function(o,key){
    return o.currentStyle? o.currentStyle[key] : document.defaultView.getComputedStyle(o,false)[key];     
};

//拖拽的实现
var startDrag = function(bar, target, callback){
    if(getCss(target, "left") !== "auto"){
        params.left = getCss(target, "left");
    }
    if(getCss(target, "top") !== "auto"){
        params.top = getCss(target, "top");
    }
    //o是移动对象
    bar.onmousedown = function(event){
        params.flag = true;
        if(!event){
            event = window.event;
            //防止IE文字选中
            bar.onselectstart = function(){
                return false;
            }  
        }
        var e = event;
        params.currentX = e.clientX;
        params.currentY = e.clientY;
    };
    document.onmouseup = function(){
        params.flag = false;    
        if(getCss(target, "left") !== "auto"){
            params.left = getCss(target, "left");
        }
        if(getCss(target, "top") !== "auto"){
            params.top = getCss(target, "top");
        }
    };
    document.onmousemove = function(event){
        var e = event ? event: window.event;
        if(params.flag){
            var nowX = e.clientX, nowY = e.clientY;
            var disX = nowX - params.currentX, disY = nowY - params.currentY;
            target.style.left = parseInt(params.left) + disX + "px";
            target.style.top = parseInt(params.top) + disY + "px";
        }
        
        if (typeof callback == "function") {
            callback(parseInt(params.left) + disX, parseInt(params.top) + disY);
        }
    }    
};

上面那个是js的文件！！！！接下来才是界面代码。。。。

<!DOCTYPE HTML>
<html>
<head>
 <title>HTML5实现拖拽操作</title>
 <meta charset="utf-8"/>
 <style type="text/css">
#box{position:absolute; left:100px; top:100px; padding:5px; background:#f0f3f9; font-size:12px; -moz-box-shadow:2px 2px 4px #666666; -webkit-box-shadow:2px 2px 4px #666666;}
#main{border:1px solid #a0b3d6; background:white;}
#bar{line-height:24px; background:#beceeb; border-bottom:1px solid #a0b3d6; padding-left:5px; cursor:move;}
#content{width:420px; height:250px; padding:10px 5px;}
</style>
</head>
<body>
 <div id="box">
    <div id="main">
        <div id="bar">拖拽</div>
        <div id="content">
            内容……
        </div>
    </div>
</div>
</body>
</html>
<script src="http://www.zhangxinxu.com/study/js/zxx.drag.1.0.js" type="text/javascript"></script>
<script type="text/javascript">
    var oBox = document.getElementById("box");
    var oBar = document.getElementById("bar");
    startDrag(oBar, oBox);
</script>

界面端有个引用的网络js名字。。。。也可以直接用。。。。。