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How to get radiobuttonlist selected value in aspx?

Posted on 2009-05-05
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Last Modified: 2012-05-06
Hi

I need to get the selected value of a radio button list in aspx by javascript.

But it is undefined. I tried ctl01_op too as I saw the id changed to it in html.
function cald() {
var radioList = document.getElementsByName("op");
            for( var i=0; i < radioList.length; ++i)
            {
               if( radioList[i].checked)
              {
                   alert("Checked item: " + radioList[i].value)
              }
            }
}
 
 
<asp:RadioButtonList Runat="server" ID="op" name="op" RepeatDirection="Horizontal" TextAlign="Left" onchange='cald()'>
<asp:ListItem Value="*" Selected="true">*</asp:ListItem>
<asp:ListItem Value="/">/</asp:ListItem>
</asp:RadioButtonList>

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Question by:techques
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4 Comments
 
LVL 7

Expert Comment

by:ajolly
ID: 24305408
use

var radioList = document.getElementsById(<%=op.ClientID%>);
0
 

Author Comment

by:techques
ID: 24310687
the js error said it does not support this property or method.

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LVL 7

Accepted Solution

by:
ajolly earned 200 total points
ID: 24311212
try with onclick event.
The following code is working and tested.
<%@ Page Language="C#" AutoEventWireup="False" CodeFile="Success2.aspx.cs" Inherits="Success2" %>
 
<!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 runat="server">
    <title></title>
 
    <script type="text/javascript">
        function cald()
        {
            var radioList = document.getElementsByName("op");
            for (var i = 0; i < radioList.length; ++i)
            {
                if (radioList[i].checked)
                {
                    alert("Checked item: " + radioList[i].value)
                }
            }
        }
    </script>
 
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:RadioButtonList runat="server" ID="op" name="op" RepeatDirection="Horizontal"
            TextAlign="Left" onclick="cald();">
            <asp:ListItem Value="*" Selected="true">*</asp:ListItem>
            <asp:ListItem Value="/">/</asp:ListItem>
        </asp:RadioButtonList>
    </div>
    </form>
</body>
</html>

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Author Closing Comment

by:techques
ID: 31578041
excellent!
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