<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="ajaxselect.OnmouseTitle.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
<script language="javascript">
function getvalue()
{
var b=document.all.rbtid.length
var a=document.getElementById("rbtid").cells.length;
//alert(b);结果为5
//alert(a);结果为4
//for(var i=0;i<b-1;i++)这样也行
for(var i=0;i<a;i++)
{
var ss="rbtid_"+i;
var aa=document.getElementById(ss).value;
//if(eval('document.all.rbtid_'+i).checked==true) //这样也行 eval()函数能将数据符串转成js运行
var bb=document.getElementById(ss);
if(document.getElementById(ss).checked) //注意checked不能写成Checked，要不然不成功
{
alert(aa);
break;
}
}
}
或者用第二种方法:
//得到radiobuttonlist
var vRbtid=document.getElementById("rbtid");
//得到所有radio
var vRbtidList= vRbtid.getElementsByTagName("INPUT");
for(var i = 0;i<vRbtidList.length;i++)
{
if(vRbtidList[i].checked)
{
var text =vRbtid.cells[i].innerText;
var value=vRbtidList[i].value;
alert("选中项的text值为"+text+",value值为"+value);
}
}
此方法中，RadioButtonList在客户端被看成成了table，通过getElementsByTagName("INPUT")方法获取它的所有子radio，然后循环每个radio，再通过cells获取radio的text值。
</script>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<FONT face="宋体">
<asp:radiobuttonlist id="rbtid" style="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 8px" runat="server"
Width="216px" Height="176px" name="rbtid">
<asp:ListItem Value="0">0</asp:ListItem>
<asp:ListItem Value="1" Selected>1</asp:ListItem>
<asp:ListItem Value="2">2</asp:ListItem>
<asp:ListItem Value="3">3</asp:ListItem>
</asp:radiobuttonlist><INPUT style="Z-INDEX: 102; LEFT: 184px; POSITION: absolute; TOP: 256px" onclick="getvalue()"
type="button" value="Button"></FONT>
</form>
</body>
</HTML>