DIV层拖动，代码很简洁_层和布局特效

DIV层的拖动代码，自动吸附焦点位置，鼠标控制拖动，本实例中拖动对象是一个DIV表格，根据需要你可以完全改成UL、LI形式，相信你很有才，设置不同的DIV ID或CLASS ID，就可以无限制增多一个被拖动的层。

<html>
<head>
<title>DIV对象的DRAG实现</title>
<meta http-equiv="Content-Type" mrc="text/html; charset=gb2312">
<style>
*{font-size:9pt}
.dragTable{
 font-size:9pt;
 border-top:1px solid #3366cc;
 margin-bottom: 9px;
 width:100%;
 background-color:#fff;
}
td{vertical-align:top;}
.dragTR{
 cursor:move;
 color:#0066cc;
 background-color:#e5eef9;
 height:22px;
 padding-left:6px;
 font-weight:bold;
}
#parentTable{
 border-collapse:collapse;
 letter-spacing:26px;
}
</style>
<script defer>

var Drag={dragged:false,
  ao:null,
  tdiv:null,
dragStart:function(){
 Drag.ao=event.srcElement;
 if((Drag.ao.tagName=="TD")||(Drag.ao.tagName=="TR")){
  Drag.ao=Drag.ao.offsetParent;
  Drag.ao.style.zIndex=100;
 }else
  return;
 Drag.dragged=true;
 Drag.tdiv=document.createElement("div");
 Drag.tdiv.innerHTML=Drag.ao.outerHTML;
 Drag.ao.style.border="1px dashed red";
 Drag.tdiv.style.display="block";
 Drag.tdiv.style.position="absolute";
 Drag.tdiv.style.filter="alpha(opacity=70)";
 Drag.tdiv.style.cursor="move";
 Drag.tdiv.style.border="1px solid #000000";
 Drag.tdiv.style.width=Drag.ao.offsetWidth;
 Drag.tdiv.style.height=Drag.ao.offsetHeight;
 Drag.tdiv.style.top=Drag.getInfo(Drag.ao).top;
 Drag.tdiv.style.left=Drag.getInfo(Drag.ao).left;
 document.body.appendChild(Drag.tdiv);
 Drag.lastX=event.clientX;
 Drag.lastY=event.clientY;
 Drag.lastLeft=Drag.tdiv.style.left;
 Drag.lastTop=Drag.tdiv.style.top;
},

draging:function(){//重要:判断MOUSE的位置
 if(!Drag.dragged||Drag.ao==null)return;
 var tX=event.clientX;
 var tY=event.clientY;
 Drag.tdiv.style.left=parseInt(Drag.lastLeft)+tX-Drag.lastX;
 Drag.tdiv.style.top=parseInt(Drag.lastTop)+tY-Drag.lastY;
 for(var i=0;i<parentTable.cells.length;i++){
  var parentCell=Drag.getInfo(parentTable.cells[i]);
  if(tX>=parentCell.left && tX<=parentCell.right && tY>=parentCell.top && tY<=parentCell.bottom){
   var subTables=parentTable.cells[i].getElementsByTagName("table");
   if(subTables.length==0){
    if(tX>=parentCell.left && tX<=parentCell.right && tY>=parentCell.top && tY<=parentCell.bottom){
     parentTable.cells[i].appendChild(Drag.ao);
    }
    break;
   }
   for(var j=0;j<subTables.length;j++){
    var subTable=Drag.getInfo(subTables[j]);
    if(tX>=subTable.left && tX<=subTable.right && tY>=subTable.top && tY<=subTable.bottom){
     parentTable.cells[i].insertBefore(Drag.ao,subTables[j]);
     break;
    }else{
     parentTable.cells[i].appendChild(Drag.ao);
    } 
   }
  }
 }
}
,
 dragEnd:function(){
 if(!Drag.dragged)return;
 Drag.dragged=false;
 Drag.mm=Drag.repos(150,15);
 Drag.ao.style.borderWidth="0px";
 Drag.ao.style.borderTop="1px solid #3366cc";
 Drag.tdiv.style.borderWidth="0px";
 Drag.ao.style.zIndex=1;
},
getInfo:function(o){//取得坐标
 var to=new Object();
 to.left=to.right=to.top=to.bottom=0;
 var twidth=o.offsetWidth;
 var theight=o.offsetHeight;
 while(o!=document.body){
  to.left+=o.offsetLeft;
  to.top+=o.offsetTop;
  o=o.offsetParent;
 }
  to.right=to.left+twidth;
  to.bottom=to.top+theight;
 return to;
},
repos:function(aa,ab){
 var f=Drag.tdiv.filters.alpha.opacity;
 var tl=parseInt(Drag.getInfo(Drag.tdiv).left);
 var tt=parseInt(Drag.getInfo(Drag.tdiv).top);
 var kl=(tl-Drag.getInfo(Drag.ao).left)/ab;
 var kt=(tt-Drag.getInfo(Drag.ao).top)/ab;
 var kf=f/ab;
 return setInterval(function(){if(ab<1){
       clearInterval(Drag.mm);
       Drag.tdiv.removeNode(true);
       Drag.ao=null;
       return;
      }
     ab--;
     tl-=kl;
     tt-=kt;
     f-=kf;
     Drag.tdiv.style.left=parseInt(tl)+"px";
     Drag.tdiv.style.top=parseInt(tt)+"px";
     Drag.tdiv.filters.alpha.opacity=f;
    }
,aa/ab)
},
 inint:function(){//初始化
 for(var i=0;i<parentTable.cells.length;i++){
  var subTables=parentTable.cells[i].getElementsByTagName("table");
  for(var j=0;j<subTables.length;j++){
   if(subTables[j].className!="dragTable")break;
   subTables[j].rows[0].className="dragTR";
   subTables[j].rows[0].attachEvent("onmousedown",Drag.dragStart);
  }
 }
 document.onmousemove=Drag.draging;
 document.onmouseup=Drag.dragEnd;
}
//end of Object Drag
}
Drag.inint();

function _show(str){
 var w=window.open('','');
 var d=w.document;
 d.open();
 str=str.replace(/=(?!")(.*?)(?!")( |>)/g,"=\"$1\"$2");
 str=str.replace(/(<)(.*?)(>)/g,"<span style='color:red;'><$2></span><br />");
 str=str.replace(/\r/g,"<br />\n");
 d.write(str);
}
</script>
</head>
<body>
<table border="0" cellpadding="0" cellspacing="10" width="100%" height=500 id="parentTable">
<tr >
 <td width="25%" valgin="top">
  <table border=0 class="dragTable" cellspacing="0">
   <tr>
    <td><b>层拖动</b></td>
   </tr>
   <tr>
    <td>你好，这是一个层拖动的示例，很简单，希望能帮到你！</td>
   <tr>
  </table>
  <table border=0 class="dragTable" cellspacing="0">
   <tr>
    <td>焦点</td>
   </tr>
   <tr>
    <td>模板无忧提供优秀源码、源程序下载，是一个学习型源码下载站。</td>
   <tr>
  </table>
 </td>
 <td width="25%">
  <table border=0 class="dragTable" cellspacing="0">
   <tr>
    <td>模板无忧给你拜年！</td>
   </tr>
   <tr>
    <td>新年过完了，祝大家在新一年牛年大吉！发大财！</td>
   <tr>
  </table></td>
 <td width="25%">
  </td>
</tr>
</table>
</body>
</html>

所属频道：层和布局特效/更新时间：2012-12-18

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