js div浮动层拖拽效果代码 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js div浮动层拖拽效果代码 - 站长素材</title>
<style type="text/css">
div,h2,p{margin:0;padding:0;}
body{font:14px/1.5 arial;}
#box{width:400px;height:200px;background:#fef4eb;padding:5px;margin:50px;border:1px solid #f60;}
#box .title{height:25px;background:#f60;}
#tool{margin-bottom:10px;}
</style>
<script type="text/javascript">
function Drag()
{
    //初始化
    this.initialize.apply(this, arguments)
}
Drag.prototype = {
    //初始化
    initialize : function (drag, options)
    {
        this.drag = this.$(drag);
        this._x = this._y = 0;
        this._moveDrag = this.bind(this, this.moveDrag);
        this._stopDrag = this.bind(this, this.stopDrag);
        
        this.setOptions(options);
        
        this.handle = this.$(this.options.handle);
        this.maxContainer = this.$(this.options.maxContainer);
        
        this.maxTop = Math.max(this.maxContainer.clientHeight, this.maxContainer.scrollHeight) - this.drag.offsetHeight;
        this.maxLeft = Math.max(this.maxContainer.clientWidth, this.maxContainer.scrollWidth) - this.drag.offsetWidth;
        
        this.limit = this.options.limit;
        this.lockX = this.options.lockX;
        this.lockY = this.options.lockY;
        this.lock = this.options.lock;
        
        this.onStart = this.options.onStart;
        this.onMove = this.options.onMove;
        this.onStop = this.options.onStop;
        
        this.handle.style.cursor = "move";
        
        this.changeLayout();
        
        this.addHandler(this.handle, "mousedown", this.bind(this, this.startDrag))
    },
    changeLayout : function ()
    {
        this.drag.style.top = this.drag.offsetTop + "px";
        this.drag.style.left = this.drag.offsetLeft + "px";
        this.drag.style.position = "absolute";
        this.drag.style.margin = "0"
    },
    startDrag : function (event)
    {        
        var event = event || window.event;
        
        this._x = event.clientX - this.drag.offsetLeft;
        this._y = event.clientY - this.drag.offsetTop;
        
        this.addHandler(document, "mousemove", this._moveDrag);
        this.addHandler(document, "mouseup", this._stopDrag);
        
        event.preventDefault && event.preventDefault();
        this.handle.setCapture && this.handle.setCapture();
        
        this.onStart()
    },
    moveDrag : function (event)
    {
        var event = event || window.event;
        
        var iTop = event.clientY - this._y;
        var iLeft = event.clientX - this._x;
        
        if (this.lock) return;
        
        this.limit && (iTop < 0 && (iTop = 0), iLeft < 0 && (iLeft = 0), iTop > this.maxTop && (iTop = this.maxTop), iLeft > this.maxLeft && (iLeft = this.maxLeft));
        
        this.lockY || (this.drag.style.top = iTop + "px");
        this.lockX || (this.drag.style.left = iLeft + "px");
        
        event.preventDefault && event.preventDefault();
        
        this.onMove()
    },
    stopDrag : function ()
    {
        this.removeHandler(document, "mousemove", this._moveDrag);
        this.removeHandler(document, "mouseup", this._stopDrag);
        
        this.handle.releaseCapture && this.handle.releaseCapture();
        
        this.onStop()
    },
    //参数设置
    setOptions : function (options)
    {
        this.options =
        {
            handle:            this.drag, //事件对象
            limit:            true, //锁定范围
            lock:            false, //锁定位置
            lockX:            false, //锁定水平位置
            lockY:            false, //锁定垂直位置
            maxContainer:    document.documentElement || document.body, //指定限制容器
            onStart:        function () {}, //开始时回调函数
            onMove:            function () {}, //拖拽时回调函数
            onStop:            function () {}  //停止时回调函数
        };
        for (var p in options) this.options[p] = options[p]
    },
    //获取id
    $ : function (id)
    {
        return typeof id === "string" ? document.getElementById(id) : id
    },
    //添加绑定事件
    addHandler : function (oElement, sEventType, fnHandler)
    {
        return oElement.addEventListener ? oElement.addEventListener(sEventType, fnHandler, false) : oElement.attachEvent("on" + sEventType, fnHandler)
    },
    //删除绑定事件
    removeHandler : function (oElement, sEventType, fnHandler)
    {
        return oElement.removeEventListener ? oElement.removeEventListener(sEventType, fnHandler, false) : oElement.detachEvent("on" + sEventType, fnHandler)
    },
    //绑定事件到对象
    bind : function (object, fnHandler)
    {
        return function ()
        {
            return fnHandler.apply(object, arguments)    
        }
    }
};





//应用
window.onload = function ()
{
    var oBox = document.getElementById("box");    
    var oTitle = oBox.getElementsByTagName("h2")[0];
    var oSpan = document.getElementsByTagName("span")[0];
    var oDrag = new Drag(oBox, {handle:oTitle, limit:false});
    var aInput = document.getElementsByTagName("input");
    
    //锁定范围接口
    aInput[0].onclick = function ()
    {
        oDrag.limit = !oDrag.limit;
        this.value = oDrag.limit ? "取消锁定范围" : "锁定范围"
    };
    
    //水平锁定接口
    aInput[1].onclick = function ()
    {
        oDrag.lockX = !oDrag.lockX;
        this.value = oDrag.lockX ? "取消水平锁定" : "水平锁定"
    };
    
    //垂直锁定接口
    aInput[2].onclick = function ()
    {
        oDrag.lockY = !oDrag.lockY;
        this.value = oDrag.lockY ? "取消垂直锁定" : "垂直锁定"
    };
    
    //锁定位置接口
    aInput[3].onclick = function ()
    {
        oDrag.lock = !oDrag.lock;
        this.value = oDrag.lock ? "取消锁定位置" : "锁定位置"
    };
    
    //开始拖拽时方法
    oDrag.onStart = function ()
    {
        oSpan.innerHTML = "开始拖拽"    
    };
    
    //开始拖拽时方法
    oDrag.onMove = function ()
    {
        oSpan.innerHTML = "left:" + this.drag.offsetLeft + ", top:" + this.drag.offsetTop    
    };
    
    //开始拖拽时方法
    oDrag.onStop = function ()
    {
        oSpan.innerHTML = "结束拖拽"    
    };
};
</script>
</head>
<body>
<br /><br /><br /><br /><br />
<center>
<div id="tool">
    <input type="button" value="锁定范围" />
    <input type="button" value="水平锁定" />
    <input type="button" value="垂直锁定" />
    <input type="button" value="锁定位置" />
</div>
<p>拖放状态：<span>未开始</span></p>
<div id="box">
    <h2 class="title"></h2>
</div>
</center>
</body>
</html>

 

posted @ 2016-09-18 16:05  小伙、不一般  阅读(1528)  评论(0)  编辑  收藏  举报