ASP.NET has no Required Field Validator available for Checkbox List or Checkbox .
Below is the Example to use Custom Validator for checkboxlist which validates that atleast one checkbox should be selected from the list.
ExCustomValidator1.aspx
Below is the Example to use Custom Validator for checkboxlist which validates that atleast one checkbox should be selected from the list.
ExCustomValidator1.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ExCustomValidator1.aspx.cs" Inherits="ExCustomValidator1"%>
<script language="javascript" type="text/javascript">
function CheckAgeGroup(sender, args)
{
var options = document.getElementById('chKAge').getElementsByTagName('input');
var ischecked=false;
args.IsValid =false;
for(i=0;i<options.length;i++)
{
var opt = options[i];
if(opt.type=="checkbox")
{
if(opt.checked)
{
ischecked= true;
args.IsValid = true;
}
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:CheckBoxList ID="chKAge" CellPadding="2" cellspacing="0" RepeatColumns="2" runat="server">
<asp:ListItem Value="1">2-9</asp:ListItem>
<asp:ListItem Value="2">10-18</asp:ListItem>
<asp:ListItem Value="3">19-30</asp:ListItem>
<asp:ListItem Value="4">30-60</asp:ListItem>
</asp:CheckBoxList>
<asp:CustomValidator ClientValidationFunction="CheckAgeGroup" ValidationGroup="Group1" ID="ValidateAge" runat="server" ErrorMessage="Please Select Age Group" > </asp:CustomValidator>
<asp:Button ID="btnSubmit" Text ="submit" runat ="server" ValidationGroup = "Group1" />
</div>
</form>
</body>
</html>
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