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c# web 如何使用RequiredFieldValidator控件验证CheckBoxList

2012-04-25 15:49 686 查看
<%@ 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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