推荐订阅源

js：

<script language="javascript" type="text/javascript">
        function validateChklst(source, args) { //验证CheckBoxList必须选择且只能选择一个
            var obj = document.getElementById('<%=chklstConclusion.ClientID%>');
            var i, k = 0, isCheck = false;
            var tags = obj.all.tags('input');
            var n = tags.length; //返回obj对象里具有“input”标签对象的集合
            for (i = 0; i < n; i++) {
                if (tags[i].checked) {
                    isCheck = true;
                    k++;
                }
            }
            if (isCheck && k == 1)
                args.IsValid = true;
            else
                args.IsValid = false;
        }
</script>

前台aspx

<table border="0" cellspacing="0" cellpadding="0">
                <tr>
                    <td width="65">
                        评价结论：
                    </td>
                    <td>
                        <asp:CheckBoxList ID="chklstConclusion" runat="server" RepeatDirection="Horizontal">
                            <asp:ListItem>允许运行</asp:ListItem>
                            <asp:ListItem>监督运行</asp:ListItem>
                            <asp:ListItem>暂停运行</asp:ListItem>
                            <asp:ListItem>停止运行</asp:ListItem>
                        </asp:CheckBoxList>
                    </td>
                    <td>
                        <asp:CustomValidator ID="cvConclusion" runat="server" ErrorMessage="*请选择评价结论(只能选择一个)!"
                            ClientValidationFunction="validateChklst"></asp:CustomValidator>
                    </td>
                </tr>
</table>