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How to get radiobuttonlist selected value in aspx?

Posted on 2009-05-05
4
2,257 Views
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
  • 2
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4 Comments
 
LVL 7

Expert Comment

by:ajolly
Comment Utility
use

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

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

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LVL 7

Accepted Solution

by:
ajolly earned 50 total points
Comment Utility
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
Comment Utility
excellent!
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