c# web 如何使用RequiredFieldValidator控件验证CheckBoxList

来源：互联网发布：上市大数据公司排名编辑：程序博客网时间：2024/06/04 19:48
<%@ 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>