How do I determine which radio button is selected in a radiobutton list using javascript

Hi,

I'm quite new to javascript so I'm having alot of problems figuring this out. On my web form I am trying to figure out how to use Javascript to determine which radio button is selected from a radio button list.  Once I know which radio list item is selected, I then want to display various panels based on the selection.

Please see attached code. I would like to have a javascript solution not jquery.

Thanks
var selectedButton = getSelectedRadioButton("TypeSelection")

var getSelectedRadioButton = function (controlName) {
    for (var i = 0; i <= controlName.lenght; i++)
        if (controlName[i].checked) {
            return controlName[i];
        }
        else
            return "";
}

Open in new window

obb-taurusAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

 
leakim971PluritechnicianCommented:
use (replace your current code by) :

<script type="text/javascript" language="javascript">
window.onload = function() {
      var rbs = document.getElementsByName("<%= RadioButtonList1.ClientID %>").getElementsByTagName("input");
      for(var i=0;i<rbs.length;i++) {
          if( rbs[i].type == "radio" ) {
              rbs[i].onclick = function() {
                  var idPanel = this.value; // the value of the radio button is the id of the panel to hide
                  document.getElementById(idPanel).style.display = "block";
              }
          }
      }
}
</script>

Open in new window

0
 
obb-taurusAuthor Commented:
I tried your code and get the following error.
Object doesn't support property or method 'getElementsByTagName'

I should have mentioned that the radio button list is in a content page based on a master page and the script is located in a external file.  I have also registered the external file from the code behind as follows:

Page.ClientScript.RegisterClientScriptInclude("clearform", ResolveUrl(@"Scripts\JSScript.js"));
btnClear.Attributes.Add("onclick", "return clearInvoiceItemControls();");

I have attached to a button on the form for testing.  I will be using this javascript function for clearing the form as well once I get this part figured out.

Not sure how much of a difference the above will make in your code sample.

Thanks
0
 
leakim971PluritechnicianCommented:
RadioButtonList1 is the ID of your radiobutton list else replace it with your own ID
0
Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

 
obb-taurusAuthor Commented:
When I tried your code the first time I altered the code to match my name so in my case it would be:
transactionTypeSelection.ClientID and this generated the error.
0
 
leakim971PluritechnicianCommented:
my bad, we need to add [0] :

var rbs = document.getElementsByName("<%= transactionTypeSelection.ClientID %>")[0].getElementsByTagName("input");
0
 
leakim971PluritechnicianCommented:
Correction :
var rbs = document.getElementById("<%= transactionTypeSelection.ClientID %>").getElementsByTagName("input");
0
 
leakim971PluritechnicianCommented:
test page :

<%@ Page Title="Page d'accueil" Language="vb" MasterPageFile="~/Site.Master" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="WebApplication14._Default" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
<script type="text/javascript" language="javascript">
    var panelId = ["<%= Panel1.ClientID %>", "<%= Panel2.ClientID %>", "<%= Panel3.ClientID %>"]
    window.onload = function () {
        var rbs = document.getElementById("<%= transactionTypeSelection.ClientID %>").getElementsByTagName("input");
        for (var i = 0; i < rbs.length; i++) {
            if (rbs[i].type == "radio") {
                rbs[i].onclick = function () {
                    var idPanel = this.value;
                    switch (idPanel) {
                        case "1":
                            document.getElementById(panelId[0]).style.display = "block";
                            document.getElementById(panelId[1]).style.display = "none";
                            document.getElementById(panelId[2]).style.display = "none";
                            break;
                        case "2":
                            document.getElementById(panelId[0]).style.display = "none";
                            document.getElementById(panelId[1]).style.display = "block";
                            document.getElementById(panelId[2]).style.display = "none";
                            break;
                        case "3":
                            document.getElementById(panelId[0]).style.display = "none";
                            document.getElementById(panelId[1]).style.display = "none";
                            document.getElementById(panelId[2]).style.display = "block";
                            break;
                    }
                }
            }
        }
    }
</script>
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:RadioButtonList ID="transactionTypeSelection" runat="server">
    <asp:ListItem Text="One" Value="1"></asp:ListItem>
    <asp:ListItem Text="Two" Value="2"></asp:ListItem>
    <asp:ListItem Text="Three" Value="3"></asp:ListItem>
</asp:RadioButtonList>
<asp:Panel ID="Panel1" runat="server" style="display:none">HELLO FROM PANEL 1</asp:Panel>
<asp:Panel ID="Panel2" runat="server" style="display:none">HELLO FROM PANEL 2</asp:Panel>
<asp:Panel ID="Panel3" runat="server" style="display:none">HELLO FROM PANEL 3</asp:Panel>
</asp:Content>

Open in new window

0

Experts Exchange Solution brought to you by ConnectWise

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
 
leakim971PluritechnicianCommented:
0
 
obb-taurusAuthor Commented:
Thanks so much for the awesome help.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.