ASP:Checkbox验证非空的一种方法

       有的时候填表单必须非空，那checkbox比较麻烦，不能用RequiredFieldValidator 控件，所以我就用JS和customvalidator控件结合来实现。

JS代码：

 <script language="javascript" type="text/javascript">
        //验证checkbox不空
        function checkIsNotnull(source, args) {
            var ch1 = document.getElementById('<%= type1.ClientID %>');
            var ch2 = document.getElementById('<%= type2.ClientID %>');
            var ch3 = document.getElementById('<%= type3.ClientID %>');
            var ch4 = document.getElementById('<%= type4.ClientID %>');
            var ch5 = document.getElementById('<%= type5.ClientID %>');
            var ch6 = document.getElementById('<%= type6.ClientID %>');
        if (ch1.checked) {
            args.IsValid = true;
            return;
        }
        if (ch2.checked) {
            args.IsValid = true;
            return;
        }
        if (ch3.checked) {
            args.IsValid = true;
            return;
        }
        if (ch4.checked) {
            args.IsValid = true;
            return;
        }
        if (ch5.checked) {
            args.IsValid = true;
            return;
        }
        if (ch6.checked) {
            args.IsValid = true;
            return;
        }
    
    args.IsValid = false;
}

　　aspx代码：

<td colspan="2">
                                     <asp:CheckBox runat="server" ID ="type1" Font-Size="Large"  Text ="游戏影音本" />
                                     &nbsp;&nbsp;&nbsp;
                                     <asp:CheckBox runat="server" ID ="type2" Font-Size="Large"  Text ="家庭娱乐本" />
                                     &nbsp;&nbsp;&nbsp;
                                     <asp:CheckBox runat="server" ID ="type3" Font-Size="Large"  Text ="高清影音本" />
                                     &nbsp;&nbsp;&nbsp;
                                     <asp:CheckBox runat="server" ID ="type4" Font-Size="Large"  Text ="商务办公本" />
                                     &nbsp;&nbsp;&nbsp;
                                     <asp:CheckBox runat="server" ID ="type5" Font-Size="Large"  Text ="全能学生本" />
                                     &nbsp;&nbsp;&nbsp;
                                     <asp:CheckBox runat="server" ID ="type6" Font-Size="Large"  Text ="轻薄便携本" />
                                    <asp:customvalidator id="CustomValidator1" runat="server" ForeColor="Red" ErrorMessage="不能为空！" ClientValidationFunction="checkIsNotnull"></asp:customvalidator>
 </td>

显示结果：