一款很不错的Js控制div层拖动/拖放代码_JavaScript教程

导读：一个供学习不错的网页拖动层，具有丰富的层拖动设置功能，比如可设置拖动的范围、垂直、水平方向拖动，是否透明显示层等，运用JS和CSS等实...

一个供学习不错的网页拖动层，具有丰富的层拖动设置功能，比如可设置拖动的范围、垂直、水平方向拖动，是否透明显示层等，运用JS和CSS等实现的HTML层拖动网页，代码完整：

<!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>

<title>一款很不错的Js控制div层拖动/拖放代码</title>

</head>

<body>

<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));

}

}

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;

    }

};

var Drag = Class.create();

Drag.prototype = {

  //拖放对象

  initialize: function(drag, options) {

this.Drag = $(drag);//拖放对象

thisthis._x = this._y = 0;//记录鼠标相对拖放对象的位置

thisthis._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;

thisthis.onStart = this.options.onStart;

thisthis.onMove = this.options.onMove;

thisthis.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，也就是一定范围内拖动

  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,//是否透明显示拖动层

  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 || {});

  },

  //开始准备拖动

  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();

  }

};

</script>

<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>

<div id="idContainer">

<div id="idDrag"><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>

<script>

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;

dragdrag.mxLeft = drag.mxTop = 0;

dragdrag.mxRight = drag.mxBottom = 9999;

dragdrag.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(){  dragdrag.mxRight = drag.mxBottom = 200;drag.Limit = true; }

$("idLimitOff").onclick = function(){ drag.Limit = false; }

</script>

</body>

</html>

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一款很不错的Js控制div层拖动/拖放代码

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