在javascript中实现列表框项目转移_js

<script language=”JavaScript“>
 function LeftToRight(Left,Right){   //左边加到右边
  for(var i=Left.length-1;i>=0;i–){
   if(Left.options[i].selected){
   var j = Right.options.length – 1;
   for (; j >= 0; j–) {
     if (Left.options(i).value == Right.item(j).value) {
      break;
      }
     }
    if (j<0) {
    var op = document.createElement(“OPTION”);
    op.text=Left.options[i].text;
    op.value=Left.options[i].value;
   
    Right.add(op);
    //Left.options[i] = null;
    }
   }
  }
 }
function RightToLeft(Right,Left){  //右边加到左边
  for(var i=Right.length-1;i>=0;i–){
   if(Right.options[i].selected){
   var op = document.createElement(“OPTION”);
   op.text=Right.options[i].text;
   op.value=Right.options[i].value;
   Left.add(op);
   Right.options[i] = null;
   }
  }
 }
 function RightToRemove(Str){  //从右边移除
  for(var i=Str.length-1;i>=0;i–){
   if(Str.options[i].selected){
    Str.options[i] = null;
   }
  }
 }
</script>

<SELECT NAME=”left” size=”10″ multiple=”true”>
<option value=”1″>AAA</option>
<option value=”2″>BBB</option>
<option value=”3″>CCC</option>
<option value=”4″>DDD</option>
<option value=”5″>EEE</option>
</SELECT>
<input type=”button” value=”—>” ><br/>
<br/>
<input type=”button” value=”<—” ><Br /><Br />
<input type=”button” value=”<–>” >

<SELECT NAME=”right” size=”10″ multiple=”true” ></SELECT>

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