js完美的div拖拽实例代码_Javascript教程-查字典教程网

复制代码代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

div,h2,p{margin:0;padding:0;}

body{font:14px/1.5 arial;}

#box{width:100px;height:100px;background:#fef4eb;padding:5px;margin:50px;border:1px solid #f60;}

#box .title{height:25px;background:#f60;}

#tool{margin-bottom:10px;}

</style>

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>

</div>

</div>

</body>

</html>

</td>

</tr>

</table>