js div浮动层拖拽效果代码

时间：2024-01-19 11:06:08
<!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>

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