js完美的div拖拽实例代码

日期：2020-06-11 栏目：程序人生浏览：次

<!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>拖拽库</title>
<style type="text/css">
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>
<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)
  }
}
};

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js完美的div拖拽实例代码

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