Question

如何使用RequiredFieldValidator控件验证CheckBoxList

Answer 1

由于 RequiredFieldValidator无法直接验证 CheckBoxList 类型控件是否为空值，我们可以在Client端Script来进行验证，代码如下。

<asp:CheckBoxList ID="IssueTypeCheckBox" runat="server" RepeatDirection="Horizontal">
<asp:ListItem Value="1">Hardware</asp:ListItem>
<asp:ListItem Value="2">BIOS/Firmware</asp:ListItem>
<asp:ListItem Value="3">Software </asp:ListItem>
<asp:ListItem Value="4">Mechanical</asp:ListItem>
<asp:ListItem Value="5">Manufacturing</asp:ListItem>
<asp:ListItem Value="6">Others</asp:ListItem>
</asp:CheckBoxList>
<asp:customvalidator id="CustomValidator1" runat="server" ErrorMessage="*" ClientValidationFunction="checkIssueType"></asp:customvalidator>
<asp:Button runat="server" ID="btn" text="Submit" />

<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>