Diary of a .NET Developer

December 25, 2011

ASP.NET AJAX ModalPopupExtender – Working with Validators

Filed under: AJAX, ASP.NET — Tags: , — ip3lee @ 11:38 am

Extending further from our previous example with the ASP.NET AJAX ModalPopupExtender, the lightbox may contain data input fields that require input validation.

When using validators with an ASP.NET AJAX ModalPopupExtender, there is one very important thing to keep in mind and that is the use of a ValidationGroup. The ValidationGroup ensures that only actions performed within lightbox only trigger the validators that are related to it and also ensures that they only fire when the relevant action is initiated.

See the source code below for an example of how the ValidationGroup is applied with the use of a RequiredFieldValidator:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ModalPopupExtendarWithPostback._Default" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<!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">
    <style type="text/css">
            background-color: #CCCCFF;
            filter: alpha(opacity=40);
            opacity: 0.5;
    <form id="form1" runat="server">
    <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
        <asp:Button ID="Button1" runat="server" Text="Popup" OnClick="Button1_Click"></asp:Button>
        <asp:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="Button1"
            BackgroundCssClass="modalBackground" PopupControlID="Panel1">
        <asp:Panel ID="Panel1" runat="server">
                <asp:UpdatePanel ID="UpdatePanel1" runat="Server" UpdateMode="Conditional">
                        <asp:TextBox ID="TextBox1" runat="server" ValidationGroup="Popup"></asp:TextBox>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="RequiredFieldValidator"
                            ControlToValidate="TextBox1" Display="Dynamic" SetFocusOnError="true" ValidationGroup="Popup"></asp:RequiredFieldValidator>
                        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                            <asp:ListItem Text="1" Value="1"></asp:ListItem>
                            <asp:ListItem Text="2" Value="2"></asp:ListItem>
                            <asp:ListItem Text="3" Value="3"></asp:ListItem>
                            <asp:ListItem Text="4" Value="4"></asp:ListItem>
                            <asp:ListItem Text="5" Value="5"></asp:ListItem>
                        <asp:Label ID="Label1" runat="server"></asp:Label>
                        <asp:AsyncPostBackTrigger ControlID="DropDownList1" EventName="SelectedIndexChanged" />
                <asp:Button ID="Button3" runat="server" Text="Save" OnClick="Button3_Click" ValidationGroup="Popup" />
                <asp:Button ID="Button2" runat="server" Text="Close" OnClick="Button2_Click" />
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  1. This is by far the best validation in an ajax Modalpopup extender published in internet.

    Comment by Dave — June 18, 2013 @ 7:11 am

    • Glad it helped. Definitely not a lot of information on this readily available on the Internet.

      Comment by ip3lee — June 19, 2013 @ 9:32 pm

  2. Thank you. Simple and easy to use.

    Comment by Greg Davis — August 16, 2013 @ 8:18 am

  3. really nice sir …
    you can try another example of it here this is also very helpful…

    Comment by Shubh — December 6, 2013 @ 8:26 pm

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