JS seret dan lepas contoh perpustakaan berdasarkan kemahiran implementasi_javascript berorientasikan objek-tutorial js-php.cn

JS seret dan lepas contoh perpustakaan berdasarkan kemahiran implementasi_javascript berorientasikan objek

WBOY

Lepaskan： 2016-05-16 15:37:59

asal

1301 orang telah melayarinya

Contoh dalam artikel ini menerangkan perpustakaan seret dan lepas berorientasikan objek berasaskan JS. Kongsikan dengan semua orang untuk rujukan anda. Butirannya adalah seperti berikut:

Ini ialah perpustakaan seret dan lepas JS berorientasikan objek yang boleh menetapkan penguncian mendatar, penguncian menegak, kedudukan penguncian, julat penguncian, dll. Selepas menetapkan julat ini, penyeretan hanya boleh dilakukan dalam mod yang ditetapkan Contoh seret dan lepas yang cukup bagus.

Tangkapan skrin kesan berjalan adalah seperti berikut:

Alamat demo dalam talian adalah seperti berikut:

http://demo.jb51.net/js/2015/js-mxdx-draw-plug-codes/

Kod khusus adalah seperti berikut:

<!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" &#63; document.getElementById(id) : id
 },
 //添加绑定事件
 addHandler : function (oElement, sEventType, fnHandler)
 {
  return oElement.addEventListener &#63; oElement.addEventListener(sEventType, fnHandler, false) : oElement.attachEvent("on" + sEventType, fnHandler)
 },
 //删除绑定事件
 removeHandler : function (oElement, sEventType, fnHandler)
 {
  return oElement.removeEventListener &#63; 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 &#63; "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 &#63; "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 &#63; "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 &#63; "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 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>
</body>
</html>

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