Select multiple多选上移、下移

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<TITLE> Select Demo </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<style>
	center
	{
		font-size:12px;
		color:red;
		font-weight:bold;
	}
	select
	{
		font-size:12px;
		color:green;
	}
</style>

<BODY>
	<span id='feedback'></span>
	
	<form method="post" name="myform">
  <table border="0" width="400">
 <tr>
  <td><CENTER>可选择排序方式</CENTER></td>
  <td> </td>
  <td><CENTER>已选择排序方式</CENTER></td>
 </tr>
    <tr>
      <td width="40%">
  <select  multiple name="left" id="left" size="8" style='width:200;'
  ondblclick="moveOption(document.getElementById('left'), document.getElementById('right'))">
	   <option value="20">测试数据一</option>
	   <option value="30">测试数据二</option>
	   <option value="40">测试数据三</option>
	   <option value="50">测试数据四</option>
	   <option value="60">测试数据五</option>
	   <option value="70">测试数据六</option>  
	   <option value="80">测试数据七</option>
	   <option value="90">测试数据八</option>  
  </select>
   </td>
      <td width="20%" align="center">
  <input type="button" value=" >> " onclick="moveOption(document.getElementById('left'),document.getElementById('right'))"><br><br>
  <input type="button" value=" << " onclick="dropOption(document.getElementById('right'))">
   </td>
      <td width="40%">
  <select  multiple name="right" id="right" size="8" style='width:200;'
  ondblclick="dropOption(document.getElementById('right'))">
  </select>
   </td>
    </tr>
<tr>
<td colspan="3"><CENTER>
	<INPUT TYPE="button" value="置顶" onclick="moveTop(document.getElementById('right'));">
	<INPUT TYPE="button" value="上移" onclick="moveUp(document.getElementById('right'));">
	<INPUT TYPE="button" value="下移" onclick="moveDown(document.getElementById('right'));">
	<INPUT TYPE="button" value="置底" onclick="moveBottom(document.getElementById('right'));">
</CENTER></td>
</tr>
  </table>
	
 
</BODY>
</HTML>


<SCRIPT LANGUAGE="JavaScript">
<!--
	//上移
	function moveUp(obj){
		for(var i=1; i < obj.options.length; i++){//最上面的一个不需要移动，所以直接从i=1开始
			if(obj.options[i].selected){
				if(!obj.options.item(i-1).selected){
					var selText = obj.options[i].text;
					var selValue = obj.options[i].value;
					obj.options[i].text = obj.options[i-1].text;
					obj.options[i].value = obj.options[i-1].value;
					obj.options[i].selected = false;
					obj.options[i-1].text = selText;
					obj.options[i-1].value = selValue;
					obj.options[i-1].selected=true;
				}
			}
		}
	}
	
	//下移
	function moveDown(obj){
		for(var i = obj.options.length -2 ; i >= 0; i--){//向下移动，最后一个不需要处理，所以直接从倒数第二个开始
			if(obj.options[i].selected){
				if(!obj.options[i+1].selected){
					var selText = obj.options[i].text;
					var selValue = obj.options[i].value;
					obj.options[i].text = obj.options[i+1].text;
					obj.options[i].value = obj.options[i+1].value;
					obj.options[i].selected = false;
					obj.options[i+1].text = selText;
					obj.options[i+1].value = selValue;
					obj.options[i+1].selected=true;
				}
			}
		}
	}
	
	//移动
	function moveOption(obj1, obj2){
		for(var i = obj1.options.length - 1 ; i >= 0 ; i--){
			if (obj2.options.length > 0){
		        var exsits = false;
		        for (var j = 0; j < obj2.options.length; j ++ ){
					if (obj2.options[j].value == obj1.options[i].value){
			            exsits = true;
			            break;
					}
		        }
		        if(exsits){
					continue;
		        }
		    }
			if(obj1.options[i].selected){
				var opt = new Option(obj1.options[i].text,obj1.options[i].value);
				opt.selected = true;
				obj2.options.add(opt);
				//obj1.remove(i);
			}
		}
	}
	
	//删除
	function dropOption(obj){
		for(var i = obj.options.length - 1 ; i >= 0 ; i--){
			if(obj.options[i].selected){
				obj.remove(i);
			}
		}
	}
	
	//置顶
	function  moveTop(obj){ 
		var opts = []; 
		for(var i =obj.options.length -1 ; i >= 0; i--){
			if(obj.options[i].selected){
				opts.push(obj.options[i]);
				obj.remove(i);
			}
		}
		var index = 0 ;
		for(var t = opts.length-1 ; t>=0 ; t--){
			var opt = new Option(opts[t].text,opts[t].value);
			opt.selected = true;
			obj.options.add(opt, index++);
		}
	} 
	//置底
	function  moveBottom(obj){ 
		var opts = []; 
		for(var i =obj.options.length -1 ; i >= 0; i--){
			if(obj.options[i].selected){
				opts.push(obj.options[i]);
				obj.remove(i);
			}
		}
		for(var t = opts.length-1 ; t>=0 ; t--){
			var opt = new Option(opts[t].text,opts[t].value);
			opt.selected = true;
			obj.options.add(opt);
		}
	}

	//-->
</SCRIPT>
Select multiple多选上移、下移

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