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Oct 23, 2012

Custom validator with Javascript

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="UsingCustomValidator" %>

<!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>Using a CustomValidator</title>
</head>
<body>
    <form id="form1" runat="server">
   
    Enter a date:<br />
    <asp:TextBox ID="txtDate" runat="server"></asp:TextBox>
    <asp:CustomValidator ID="custDate" runat="server"
       ControlToValidate="txtDate"
       ValidateEmptyText="false" 
       Text="Enter a valid future date"
       OnServerValidate="custDate_ServerValidate" />  
   

   <script type="text/javascript">
     function validateOrFields(source, args){
       var sUser = document.form1.<%= txtUser.ClientID %>.value;
       var sEmail = document.form1.<%= txtEmail.ClientID %>.value;
      
       if (sUser == "" && sEmail == "")
       {
          args.IsValid = false;
       }
       else
       {
          args.IsValid = true;
       } 
       return; 
     }
   </script>
  
   Enter user name:<br />
   <asp:TextBox ID="txtUser" runat="server"></asp:TextBox>
   <br />
   Enter email:<br />
   <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>

   <asp:CustomValidator ID="OrFieldValidator"
                        runat="server"
                        Text="Enter either a user name or a email"
                        ClientValidationFunction="validateOrFields"
                        OnServerValidate="OrFieldValidator_ServerValidate" />  
  

  
   <asp:Button ID="btnSubmit" Text="Click this to test validation" runat="server" />
  
   </form>
</body>
</html>
<script type="text/javascript">
  ValidatorHookupControlID("<%= txtUser.ClientID %>",document.getElementById("<%= OrFieldValidator.ClientID %>"));
  ValidatorHookupControlID("<%= txtEmail.ClientID %>",document.getElementById("<%= OrFieldValidator.ClientID %>"));
</script>
 File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class UsingCustomValidator : System.Web.UI.Page
{
   protected void custDate_ServerValidate(object source, ServerValidateEventArgs args)
   {
      string sEnteredDate = args.Value;
      DateTime dt;
      bool convertSuccessful = DateTime.TryParse(sEnteredDate, out dt);
      if (convertSuccessful && dt >= DateTime.Today)
         args.IsValid = true;
      else
         args.IsValid = false;
   }

   protected void OrFieldValidator_ServerValidate(object source, ServerValidateEventArgs args)
   {
      if (txtUser.Text.Length <= 0 && txtEmail.Text.Length <= 0)
         args.IsValid = false;
      else
         args.IsValid = true;
   }
}
at

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