c# web 如何使用RequiredFieldValidator控件验证CheckBoxList

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="CheckboxlistDemo._Default" %>
<!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 language="javascript" type="text/javascript">
        function checkIssueType(source, args) {
            var chkListaTipoModificaciones = document.getElementById('<%= IssueTypeCheckBox.ClientID %>');
            var chkLista = chkListaTipoModificaciones.getElementsByTagName("input");
            for (var i = 0; i < chkLista.length; i++) {
                if (chkLista[i].checked) {
                    args.IsValid = true;
                    return;
                }
            }
            args.IsValid = false;
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table>
            <tr>
                <td>
                    <asp:CheckBoxList ID="IssueTypeCheckBox" runat="server" RepeatDirection="Horizontal">
                        <asp:ListItem Value="1">Hardware</asp:ListItem>
                        <asp:ListItem Value="2">Software </asp:ListItem>
                        <asp:ListItem Value="3">Mechanical</asp:ListItem>
                        <asp:ListItem Value="4">Others</asp:ListItem>
                    </asp:CheckBoxList>
                </td>
                <td>
                    <asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="*" ClientValidationFunction="checkIssueType"></asp:CustomValidator>
                </td>
            </tr>
            <tr>
            <td><asp:Button runat="server" ID="btn" Text="Submit"/></td>
            <td> </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>


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