JS实现元素拖动

实现1

参考文献:http://www.cnblogs.com/cloudgamer/archive/2008/11/17/Drag.html

1.1 拖放效果

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- saved from url=(0037)http://sandbox.runjs.cn/show/hbhrnv2g -->
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        
        <title>
            拖放效果
        </title>
    </head>
    
    <body>
        
        <div id="idContainer" style="position: relative;">
            <div id="idDrag" style="position: absolute;">
                <div id="idHandle">
                </div>
            </div>
        </div>
        
        <input id="idReset" type="button" value="复位">
        <input id="idLock" type="button" value="锁定">
        <input id="idLockX" type="button" value="锁定水平">
        <input id="idLockY" type="button" value="锁定垂直">
        <input id="idLimit" type="button" value="范围锁定">
        <input id="idLimitOff" type="button" value="取消范围锁定">
        <br>
        拖放状态:
        <span id="idShow">
            未开始
        </span>
    


        <style>#idContainer{
    border:10px solid #990000;
    width:600px;
    height:300px;
}
#idDrag{
    border:5px solid #C4E3FD;
    background:#C4E3FD;
    width:50px;
    height:50px;
    top:50px;
    left:50px;
}
#idHandle{
    cursor:move;
    height:25px;
    background:#0000FF;
    overflow:hidden;
}</style>
                <script>//以下是实现的插件
var isIE = (document.all) ? true: false;

var $ = function(id) {
    return "string" == typeof id ? document.getElementById(id) : id;
};

var Class = {
    create: function() {
        return function() {
            this.initialize.apply(this, arguments);
        }
    }
}

var Extend = function(destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }
}

var Bind = function(object, fun) {
    return function() {
        return fun.apply(object, arguments);
    }
}

var BindAsEventListener = function(object, fun) {
    return function(event) {
        return fun.call(object, (event || window.event));
    }
}

var CurrentStyle = function(element) {
    return element.currentStyle || document.defaultView.getComputedStyle(element, null);
}

function addEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.addEventListener) {
        oTarget.addEventListener(sEventType, fnHandler, false);
    } else if (oTarget.attachEvent) {
        oTarget.attachEvent("on" + sEventType, fnHandler);
    } else {
        oTarget["on" + sEventType] = fnHandler;
    }
};

function removeEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.removeEventListener) {
        oTarget.removeEventListener(sEventType, fnHandler, false);
    } else if (oTarget.detachEvent) {
        oTarget.detachEvent("on" + sEventType, fnHandler);
    } else {
        oTarget["on" + sEventType] = null;
    }
};

//拖放程序
var Drag = Class.create();
Drag.prototype = {
    //拖放对象
    initialize: function(drag, options) {
        this.Drag = $(drag); //拖放对象
        this._x = this._y = 0; //记录鼠标相对拖放对象的位置
        this._marginLeft = this._marginTop = 0; //记录margin
        //事件对象(用于绑定移除事件)
        this._fM = BindAsEventListener(this, this.Move);
        this._fS = Bind(this, this.Stop);

        this.SetOptions(options);

        this.Limit = !!this.options.Limit;
        this.mxLeft = parseInt(this.options.mxLeft);
        this.mxRight = parseInt(this.options.mxRight);
        this.mxTop = parseInt(this.options.mxTop);
        this.mxBottom = parseInt(this.options.mxBottom);

        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 = $(this.options.Handle) || this.Drag;
        this._mxContainer = $(this.options.mxContainer) || null;

        this.Drag.style.position = "absolute";
        //透明
        if (isIE && !!this.options.Transparent) {
            //填充拖放对象
            with(this._Handle.appendChild(document.createElement("div")).style) {
                width = height = "100%";
                backgroundColor = "#fff";
                filter = "alpha(opacity:0)";
                fontSize = 0;
            }
        }
        //修正范围
        this.Repair();
        addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start));
    },
    //设置默认属性
    SetOptions: function(options) {
        this.options = { //默认值
            Handle: "",
            //设置触发对象(不设置则使用拖放对象)
            Limit: false,
            //是否设置范围限制(为true时下面参数有用,可以是负数)
            mxLeft: 0,
            //左边限制
            mxRight: 9999,
            //右边限制
            mxTop: 0,
            //上边限制
            mxBottom: 9999,
            //下边限制
            mxContainer: "",
            //指定限制在容器内
            LockX: false,
            //是否锁定水平方向拖放
            LockY: false,
            //是否锁定垂直方向拖放
            Lock: false,
            //是否锁定
            Transparent: false,
            //是否透明
            onStart: function() {},
            //开始移动时执行
            onMove: function() {},
            //移动时执行
            onStop: function() {} //结束移动时执行
        };
        Extend(this.options, options || {});
    },
    //准备拖动
    Start: function(oEvent) {
        if (this.Lock) {
            return;
        }
        this.Repair();
        //记录鼠标相对拖放对象的位置
        this._x = oEvent.clientX - this.Drag.offsetLeft;
        this._y = oEvent.clientY - this.Drag.offsetTop;
        //记录margin
        this._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0;
        this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0;
        //mousemove时移动 mouseup时停止
        addEventHandler(document, "mousemove", this._fM);
        addEventHandler(document, "mouseup", this._fS);
        if (isIE) {
            //焦点丢失
            addEventHandler(this._Handle, "losecapture", this._fS);
            //设置鼠标捕获
            this._Handle.setCapture();
        } else {
            //焦点丢失
            addEventHandler(window, "blur", this._fS);
            //阻止默认动作
            oEvent.preventDefault();
        };
        //附加程序
        this.onStart();
    },
    //修正范围
    Repair: function() {
        if (this.Limit) {
            //修正错误范围参数
            this.mxRight = Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth);
            this.mxBottom = Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight);
            //如果有容器必须设置position为relative或absolute来相对或绝对定位,并在获取offset之前设置
            ! this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || CurrentStyle(this._mxContainer).position == "absolute" || (this._mxContainer.style.position = "relative");
        }
    },
    //拖动
    Move: function(oEvent) {
        //判断是否锁定
        if (this.Lock) {
            this.Stop();
            return;
        };
        //清除选择
        window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
        //设置移动参数
        var iLeft = oEvent.clientX - this._x,
        iTop = oEvent.clientY - this._y;
        //设置范围限制
        if (this.Limit) {
            //设置范围参数
            var mxLeft = this.mxLeft,
            mxRight = this.mxRight,
            mxTop = this.mxTop,
            mxBottom = this.mxBottom;
            //如果设置了容器,再修正范围参数
            if ( !! this._mxContainer) {
                mxLeft = Math.max(mxLeft, 0);
                mxTop = Math.max(mxTop, 0);
                mxRight = Math.min(mxRight, this._mxContainer.clientWidth);
                mxBottom = Math.min(mxBottom, this._mxContainer.clientHeight);
            };
            //修正移动参数
            iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft);
            iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop);
        }
        //设置位置,并修正margin
        if (!this.LockX) {
            this.Drag.style.left = iLeft - this._marginLeft + "px";
        }
        if (!this.LockY) {
            this.Drag.style.top = iTop - this._marginTop + "px";
        }
        //附加程序
        this.onMove();
    },
    //停止拖动
    Stop: function() {
        //移除事件
        removeEventHandler(document, "mousemove", this._fM);
        removeEventHandler(document, "mouseup", this._fS);
        if (isIE) {
            removeEventHandler(this._Handle, "losecapture", this._fS);
            this._Handle.releaseCapture();
        } else {
            removeEventHandler(window, "blur", this._fS);
        };
        //附加程序
        this.onStop();
    }
};

//以下是调用以上插件实现拖动
var drag = new Drag("idDrag", {
    mxContainer: "idContainer",
    Handle: "idHandle",
    Limit: true,
    onStart: function() {
        $("idShow").innerHTML = "开始拖放";
    },
    onMove: function() {
        $("idShow").innerHTML = "left:" + this.Drag.offsetLeft + ";top:" + this.Drag.offsetTop;
    },
    onStop: function() {
        $("idShow").innerHTML = "结束拖放";
    }
});

$("idReset").onclick = function() {
    drag.Limit = true;
    drag.mxLeft = drag.mxTop = 0;
    drag.mxRight = drag.mxBottom = 9999;
    drag.LockX = drag.LockY = drag.Lock = false;
}

$("idLock").onclick = function() {
    drag.Lock = true;
}
$("idLockX").onclick = function() {
    drag.LockX = true;
}
$("idLockY").onclick = function() {
    drag.LockY = true;
}
$("idLimit").onclick = function() {
    drag.mxRight = drag.mxBottom = 200;
    drag.Limit = true;
}
$("idLimitOff").onclick = function() {
    drag.Limit = false;
}</script>
    
<!-- Generated by RunJS (Sun Mar 13 10:40:31 CST 2016) 0ms --></body></html>
View Code

效果:http://sandbox.runjs.cn/show/hbhrnv2g

1.2 简易拖放效果

<!DOCTYPE html>
<!-- saved from url=(0037)http://sandbox.runjs.cn/show/xq0yj0sd -->
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        
        <title>简易拖放效果</title>
    </head>
    <body>
        <div id="central" style="position: absolute;">
            此拖动效果要将被拖动元素布局设为absolute
        </div>
    

        <style>#central
{
    background-color:pink;
    width:300px;
    height:200px;
}</style>
                <script>var isIE = (document.all) ? true: false;

var $ = function(id) {
    return "string" == typeof id ? document.getElementById(id) : id;
};

var Class = {
    create: function() {
        return function() {
            this.initialize.apply(this, arguments);
        }
    }
}

var Extend = function(destination, source) {
    for (var property in source) {
        destination[property] = source[property];
    }
}

var Bind = function(object, fun) {
    return function() {
        return fun.apply(object, arguments);
    }
}

var BindAsEventListener = function(object, fun) {
    return function(event) {
        return fun.call(object, (event || window.event));
    }
}

function addEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.addEventListener) {
        oTarget.addEventListener(sEventType, fnHandler, false);
    } else if (oTarget.attachEvent) {
        oTarget.attachEvent("on" + sEventType, fnHandler);
    } else {
        oTarget["on" + sEventType] = fnHandler;
    }
};

function removeEventHandler(oTarget, sEventType, fnHandler) {
    if (oTarget.removeEventListener) {
        oTarget.removeEventListener(sEventType, fnHandler, false);
    } else if (oTarget.detachEvent) {
        oTarget.detachEvent("on" + sEventType, fnHandler);
    } else {
        oTarget["on" + sEventType] = null;
    }
};

//拖放程序
var SimpleDrag = Class.create();
SimpleDrag.prototype = {
    //拖放对象,触发对象
    initialize: function(drag) {
        this.Drag = $(drag);
        this._x = this._y = 0;
        this._fM = BindAsEventListener(this, this.Move);
        this._fS = Bind(this, this.Stop);
        this.Drag.style.position = "absolute";
        addEventHandler(this.Drag, "mousedown", BindAsEventListener(this, this.Start));
    },
    //准备拖动
    Start: function(oEvent) {
        this._x = oEvent.clientX - this.Drag.offsetLeft;
        this._y = oEvent.clientY - this.Drag.offsetTop;
        addEventHandler(document, "mousemove", this._fM);
        addEventHandler(document, "mouseup", this._fS);
    },
    //拖动
    Move: function(oEvent) {
        this.Drag.style.left = oEvent.clientX - this._x + "px";
        this.Drag.style.top = oEvent.clientY - this._y + "px";
    },
    //停止拖动
    Stop: function() {
        removeEventHandler(document, "mousemove", this._fM);
        removeEventHandler(document, "mouseup", this._fS);
    }
};

new SimpleDrag("central");</script>
    
<!-- Generated by RunJS (Sun Mar 13 10:41:02 CST 2016) 0ms --></body></html>
View Code

效果:http://sandbox.runjs.cn/show/xq0yj0sd

实现2

<!DOCTYPE html>
<!-- saved from url=(0037)http://sandbox.runjs.cn/show/o8sbts8t -->
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><html">


<title>
D类
</title>



<div id="block1_outer">
<div id="block1_inner" onmousedown="var wc = this;D.start(wc, null, function (property) {
var node = wc.parentNode;
var a = D.pos(node), b = D.pos(wc);
node.style.left = property.left - b.x + a.x + &#39;px&#39;;

node.style.top = property.top - b.y + a.y + &#39;px&#39;;
}, null);"></div>
</div>

<div id="block2_outer" onmousedown="var wc = this;D.start(wc, null, function (property) {
wc.style.left = property.left + &#39;px&#39;;
wc.style.top = property.top + &#39;px&#39;;
}, null);"></div>


        <style>html, body {
    margin:0;
}


#block1_outer
{
    position:relative;
    width:100px;
    height:100px;
    background-color:#000000;
}
#block1_inner
{
    position:absolute;
    width:20px;
    height:20px;
    line-height:20px;
    left:50%;
    top:50%;
    margin:-10px 0 0 -10px;
    
    background-color:#F00;
    text-align:center;
    cursor:move;
}

#block2_outer
{
    width:50px;
    height:50px;
    line-height:50px;
    text-align:center;
    background-color:#F00;
    position:absolute;
    
    cursor:move;
}

#block2_inner
{
    position:absolute;
    width:20px;
    height:20px;
    line-height:20px;
    left:50%;
    top:50%;
    margin:-10px 0 0 -10px;
    
    background-color:#F00;
    text-align:center;
    cursor:move;
}</style>
                <script>//实现拖动的插件
!! window.__defineGetter__ && !/MSIE/.test(navigator.userAgent) &&
function() { ! window.opera && window.__defineGetter__('event',
    function() {
        //兼容Event对象
        var o = arguments.callee;
        do {
            if (o.arguments[0] instanceof Event) return o.arguments[0];
        } while ( o = o . caller );
        return null;
    });

    window.attachEvent = Document.prototype.attachEvent = Element.prototype.attachEvent = function(type, listener, capture) {
        //兼容attachEvent方法
        return this.addEventListener(new String(type).substr(2), listener, capture || false);
    };

    window.detachEvent = Document.prototype.detachEvent = Element.prototype.detachEvent = function(type, listener, capture) {
        //兼容detachEvent方法
        return this.removeEventListener(new String(type).substr(2), listener, capture || false);
    };

} ();
var D = {
    //拽补助类
    lock: false

    ,
    dom: function() {
        //document相关属性
        return {
            left: document.documentElement.scrollLeft,
            top: document.documentElement.scrollTop,
            width: document.documentElement.clientWidth,
            height: document.documentElement.clientHeight,
            body: document.documentElement
        };
    }

    ,
    mos: function(e) {
        //获取鼠标绝对位置
        var dom = this.dom();

        return {
            'x': dom.left + e.clientX,
            'y': dom.top + e.clientY
        }
    }

    ,
    pos: function(o) {
        //获取元素绝对位置
        var x = 0,
        y = 0;
        do {
            x += o.offsetLeft, y += o.offsetTop;
        } while ( o = o . offsetParent );
        return {
            'x': x,
            'y': y
        };
    }

    ,
    start: function(element, startEventHandler, moveEventHandler, stopEventHandler) {
        //移动开始
        if (this.lock) return;
        else this.lock = true;
        //先上锁安全。。。:D
        var pos = this.pos(element) //元素位置
        ,
        mos = this.mos(window.event) //鼠标位置
        ,
        eventHandlers = {
            MF: null,
            EF: null
        }
        //事件记录
        ,
        property = {
            x: mos.x - pos.x,
            y: mos.y - pos.y,
            left: pos.x,
            top: pos.y
        }
        //属性
        ,
        _MF = this.move(moveEventHandler, property) //移动过程事件闭包
        ,
        _EF = this.stop(element, stopEventHandler, eventHandlers);
        //移动停止事件闭包
        try {
            document.selection && document.selection.empty && (document.selection.empty(), 1) || window.getSelection && window.getSelection().removeAllRanges();
        } catch(exp) {}

        document.attachEvent('onmousemove', _MF);
        //鼠标移动
        document.attachEvent('onmouseup', _EF);
        //鼠标释放
        element.setCapture ? (element.setCapture(), element.attachEvent('onlosecapture', _EF)) : window.attachEvent('onblur', _EF);
        //鼠标捕获丢失则释放
        eventHandlers.MF = _MF,
        eventHandlers.EF = _EF;

        startEventHandler && startEventHandler(property);
        //直接传过去。。。请误污染- -
    }

    ,
    move: function(moveEventHandler, property) {
        //移动中
        var wc = this;

        return function(e) {
            var mos = wc.mos(e || window.event),
            dom = wc.dom();
            window.getSelection && window.getSelection().removeAllRanges();

            /MSIE/.test(navigator.userAgent) &&
            function() {
                //IE滚屏
                if (mos.x > dom.left + dom.width) dom.body.scrollLeft = mos.x - dom.width;
                else if (mos.x < dom.left) dom.body.scrollLeft = mos.x;

                if (mos.y > dom.top + dom.height) dom.body.scrollTop = mos.y - dom.height;
                else if (mos.y < dom.top) dom.body.scrollTop = mos.y;
            } ();

            property.left = mos.x - property.x,
            property.top = mos.y - property.y;

            moveEventHandler && moveEventHandler(property);
            //直接传过去。。。请误污染- -;
        };
    }

    ,
    stop: function(element, stopEventHandler, eventHandlers) {
        //移动结束
        var wc = this;
        return function(e) {
            document.detachEvent('onmousemove', eventHandlers.MF);
            document.detachEvent('onmouseup', eventHandlers.EF);
            element.setCapture ? (element.detachEvent('onlosecapture', eventHandlers.EF), element.releaseCapture()) : window.detachEvent('onblur', eventHandlers.EF);
            wc.lock = false;
            //事件都干掉了可以放心解锁了
            stopEventHandler && stopEventHandler();
        };
    }

};</script>
    
<!-- Generated by RunJS (Sun Mar 13 10:41:11 CST 2016) 1ms --></html"></body></html>
View Code

 效果:http://sandbox.runjs.cn/show/o8sbts8t

posted @ 2016-03-13 10:42  March On  阅读(939)  评论(0编辑  收藏  举报
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