如下所示：
<!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>无标题文档</title>
<script type="text/javascript">
function copyToList(from,to){
var fromList=eval('document.forms[0].'+from);
var toList=eval('document.forms[0].'+to);
if(toList.options.length > 0 && toList.options[0].value == 'temp'){
toList.options.length=0;
}
var sel=false;
for(i = 0;i < fromList.options.length;i++){
var current=fromList.options[i];
if(current.selected){
sel=true;
if(current.value=='temp'){
alert('不能选择这个项目!');
return;
}
txt=current.text;
val=current.value;
toList.options[toList.length]=new Option(txt,val);
fromList.options[i]=null;
i--;
}
}
if(!sel) alert('你还没有选择任何项目!');
}
function allSelect(){
var chsen=document.getElementById('chosen');
//如果chsen列表框为0或第一个选项值为'temp'
if(chsen.length && chsen.options[0].value=="temp")
return;
for(var i=0;i<chsen.length;i++){
chsen.options[i].selected=true;
}
//得到数据
function getdata() {
var List = document.forms[0].RoleList;
//得到一个隐藏文本框对象
var roles = document.getElementById("TRoleList");
roles.value = "";
var s = "";
if (List.length != 0) {
for (i = 0; i < List.length; i++) {
s += List.options[i].value + ",";
}
}
roles.value = s;
}
}
</script>
</head>
<body>
<table border="0">
<form onSubmit="allSelect()">
<tr>
<td>
<select name="possible" size="4" MULTIPLE width="200" style="width:200px">
<option value="1">中国广州</option>
<option value="2">中国上海</option>
<option value="3">中国北京</option>
<option value="4">中国武汉</option>
</select>
</td>
<td><a href="javascript:copyToList('possible','chosen')">添加至右方--><br>
<br>
</a><a href="javascript:copyToList('chosen','possible')"><--添加至左方</a></td>
<td>
<select name="chosen" size="4" MULTIPLE width="200" style="width:200px;">
<option value="temp">从左边选择你的地区</option>
</select>
</td>
</tr>
</form>
</table>
<input type="button" value="提交" onclick="allSelect()" />yle
<input type="text" style="display:none;" id="TRoleList">
</body>
</html>