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How to validate checkboxlist for atleast a single item to be selected..??

Posted on 2009-03-30
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Last Modified: 2013-11-07
I need to validate for atleast a single checkboxlist is to be selected using Javascript not by required field validator..
.and also do the same in server side validation....i binded the checkboxlist..plz sugest

<asp:CheckBoxList ID="CheckBoxList1" runat="server"  RepeatColumns="2">
        </asp:CheckBoxList>&nbsp;

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Question by:Rajar Ahmed
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4 Comments
 
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Expert Comment

by:sunithnair
ID: 24017731
Try like this
ASPX
 
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" %>
 
<!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>Untitled Page</title>
    <script type="text/javascript">
        function Validate()
        {
            var checkBoxes = document.getElementsByTagName("input");
            var isValid = false;
            for(var i=0;i<checkBoxes.length;i++)
            {
                if(checkBoxes[i].type=="checkbox" && checkBoxes[i].id.indexOf("CheckBoxList1")!=0)
                {
                    isValid = true;
                    break;
                }
            }
            if(!isValid)
            {
                alert("Please select atleast one value");
            }
            return isValid;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <asp:CheckBoxList ID="CheckBoxList1" runat="server"  RepeatColumns="2">
        </asp:CheckBoxList>
        <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClientClick="return Validate();" />
    </form>
</body>
</html>
 
 
CODEBEHIND
 
 
Partial Class Default2
    Inherits System.Web.UI.Page
    Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
        If Not IsPostBack Then
            CheckBoxList1.DataSource = System.IO.Directory.GetFiles("C:\\")
            CheckBoxList1.DataBind()
        End If
    End Sub
 
    Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
        If CheckBoxList1.SelectedIndex = -1 Then
            Response.Write("Nothing is selected")
        End If
 
    End Sub
End Class

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Author Comment

by:Rajar Ahmed
ID: 24017972
server side is fine ,,.. but clientside i get message of 'Please select atleast one value' even if checkbox is selected...
 
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LVL 16

Accepted Solution

by:
sunithnair earned 500 total points
ID: 24018031
Sorry the script should be like this
    <script type="text/javascript">
        function Validate()
        {
            var checkBoxes = document.getElementsByTagName("input");
            var isValid = false;
            for(var i=0;i<checkBoxes.length;i++)
            {
                if(checkBoxes[i].type=="checkbox" && checkBoxes[i].id.indexOf("CheckBoxList1")==0 && checkBoxes[i].checked)
                {
                    isValid = true;
                    break;
                }
            }
            if(!isValid)
            {
                alert("Please select atleast one value");
            }
            return isValid;
        }
    </script>

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Author Closing Comment

by:Rajar Ahmed
ID: 31564273
Thanks Mate...
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