The CustomValidator control is really flexible. Here's a quick example of validating that a checkbox is checked:
<%@ Page language="c#" Codebehind="ValidateCheckbox.aspx.cs" AutoEventWireup="false" Inherits="WebApplication1.ValidateCheckbox" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<script language="javascript">
function ValidateChecked(oSrc, args){
if(document.all["<%=chk.ClientID%>"].checked == false){
alert("Has to be checked.");
args.IsValid = false;
}
}
</script>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<asp:CustomValidator ClientValidationFunction="ValidateChecked" Runat="server" ID="val" />
<asp:CheckBox ID="chk" Runat="server" />
<asp:Button ID="btn" Runat="server" Text="Submit" />
</form>
</body>
</HTML>
And the code-behind:
private void val_ServerValidate(object source, ServerValidateEventArgs args)
{
args.IsValid = true;
if(chk.Checked == false)
args.IsValid = false;
}
Posted
11-11-2004 7:26 PM
by
Jeffrey Palermo