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Version Q2 2011 released 07/12/2011
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Button / Confirm Postback


  • RadButtons above post the page back to the server, only after the user has confirmed the postback.

    • The first button uses the browser's confirm dialog.
    • The second one uses radconfirm for the confirmation dialog.
    • The last one uses RadWindow to fully customize the look of the dialog.

Source Code

C# VB.NET
Show code in new window Demo isolation steps
  • <%@ Page Language="vb" AutoEventWireup="true" CodeFile="DefaultVB.aspx.vb" Inherits="Telerik.Web.Examples.Button.Confirm.DefaultVB" %>

    <%@ Register TagPrefix="telerik" Namespace="Telerik.Web.UI" Assembly="Telerik.Web.UI" %>
    <%@ Register TagPrefix="qsf" Namespace="Telerik.QuickStart" %>
    <%@ Register TagPrefix="qsf" TagName="Header" Src="~/Common/Header.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="HeadTag" Src="~/Common/HeadTag.ascx" %>
    <%@ Register TagPrefix="qsf" TagName="Footer" Src="~/Common/Footer.ascx" %>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <qsf:HeadTag ID="Headtag1" runat="server" />
        <style type="text/css">
        .RadWindow_Black
        {
            color:White;
        }
        </style>
    </head>
    <body class="BODY">
        <form id="form1" runat="server">
        <qsf:Header ID="Header1" runat="server" NavigationLanguage="VB" />
        <telerik:RadScriptManager ID="ScriptManager1" runat="server" />
        <script type="text/javascript">
            //<![CDATA[

            //Standard Window.confirm
            function StandardConfirm(sender, args)
            {
                args.set_cancel(!window.confirm("Are you sure you want to submit the page?"));
            }

            //RadConfirm
            function RadConfirm(sender, args)
            {
                var callBackFunction = Function.createDelegate(sender, function (shouldSubmit)
                {
                    if (shouldSubmit)
                    {
                        this.click();
                    }
                });

                var text = "Are you sure you want to submit the page?";
                radconfirm(text, callBackFunction, 300, 100, null, "RadConfirm");
                args.set_cancel(true);
            }

            //Custom RadWindow Confirm
            function CustomRadWindowConfirm(sender, args)
            {
                //Open the window
                $find("<%= confirmWindow.ClientID %>").show();
                //Focus the Yes button
                $find("<%= btnYes.ClientID %>").focus();
                //Cancel the postback
                args.set_cancel(true);
            }
            function YesOrNoClicked(sender, args)
            {
                var oWnd = $find("<%= confirmWindow.ClientID %>");
                oWnd.close();
                if (sender.get_text() == "Yes")
                {
                    $find("<%= btnCustomRadWindowConfirm.ClientID %>").click();
                }
            }
            //]]>
        </script>
        <div style="height: 50px">
            <telerik:RadButton ID="btnStandardConfirm" runat="server" Text="Standard window.confirm"
                OnClientClicking="StandardConfirm" OnClick="Button_Click">
            </telerik:RadButton>
            <asp:Label ID="Label1" runat="server" EnableViewState="false" ForeColor="Green" />
        </div>
        <div style="height: 50px">
            <telerik:RadButton ID="btnRadConfirm" runat="server" Text="RadConfirm" OnClientClicking="RadConfirm"
                OnClick="Button_Click">
            </telerik:RadButton>
            <asp:Label ID="Label2" runat="server" EnableViewState="false" ForeColor="Green" />
            <telerik:RadWindowManager ID="windowManager1" runat="server">
            </telerik:RadWindowManager>
        </div>
        <div>
            <telerik:RadButton ID="btnCustomRadWindowConfirm" runat="server" Text="Custom RadWindow Confirm"
                OnClientClicking="CustomRadWindowConfirm" OnClick="Button_Click">
            </telerik:RadButton>
            <asp:Label ID="Label3" runat="server" EnableViewState="false" ForeColor="Green" />
            <telerik:RadWindow ID="confirmWindow" runat="server" VisibleTitlebar="false" VisibleStatusbar="false"
                Modal="true" Behaviors="None" Height="150px" Width="300px">
                <ContentTemplate>
                    <div style="margin-top: 30px; float: left;">
                        <div style="width: 60px; padding-left: 15px; float: left;">
                            <img src="img/ModalDialogAlert.gif" alt="Confirm Page" />
                        </div>
                        <div style="width: 200px; float: left;">
    <asp:Label ID="lblConfirm" Font-Size="14px" Text="Are you sure you want to submit the page?"
    runat="server" />
                            <br />
                            <br />
                            <telerik:RadButton ID="btnYes" runat="server" Text="Yes" AutoPostBack="false" OnClientClicked="YesOrNoClicked">
                                <Icon PrimaryIconCssClass="rbOk" />
                            </telerik:RadButton>
                            <telerik:RadButton ID="btnNo" runat="server" Text="No" AutoPostBack="false" OnClientClicked="YesOrNoClicked">
                                <Icon PrimaryIconCssClass="rbCancel" />
                            </telerik:RadButton>
                        </div>
                    </div>
                </ContentTemplate>
            </telerik:RadWindow>
        </div>
        <qsf:Footer runat="server" ID="Footer1" />
        </form>
    </body>
    </html>

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