ASPxCallbackPanel Class

A callback panel control that allows you to update its content on a callback.

Assembly : DevExpress.Web.v25.2.dll

Declaration

C#
VB.NET

csharp

public class ASPxCallbackPanel :
    ASPxCollapsiblePanel

Public Class ASPxCallbackPanel
    Inherits ASPxCollapsiblePanel

Remarks

The Callback Panel is a container area that allows you to update its content using an AJAX-based callback technology.

Create a Callback Panel

Design Time

The ASPxCallbackPanel control is available on the DX.25.2: Navigation & Layout toolbox tab in the Microsoft Visual Studio IDE.

Drag the control onto a form and customize the control’s settings, or paste the control markup in the page’s source code.

ASPX

aspx

<dx:ASPxCallbackPanel ID="ASPxCallbackPanel1" runat="server" Width="200px">
    <PanelCollection>
        <dx:PanelContent runat="server">
            <dx:ASPxTextBox ID="ASPxTextBox1" runat="server" Width="170px">
            </dx:ASPxTextBox>
        </dx:PanelContent>
    </PanelCollection>
</dx:ASPxCallbackPanel>

csharp

protected void Page_Load(object sender, EventArgs e)
{
    ASPxCallbackPanel cpanel = new ASPxCallbackPanel();
    cpanel.ID = "ASPxCallbackPanel1";
    cpanel.Controls.Add(new ASPxTextBox() { ID = "ASPxTextBox1", Text = "Test" });
    form1.Controls.Add(cpanel);
}

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    Dim cpanel As ASPxCallbackPanel = New ASPxCallbackPanel()
    cpanel.ID = "ASPxCallbackPanel1"
    cpanel.Controls.Add(New ASPxTextBox() With {
        .ID = "ASPxTextBox1",
        .Text = "Test"
    })
    form1.Controls.Add(cpanel)
End Sub

Note

DevExpress controls require that you register special modules, handlers, and options in the Web.config file. You can change this file or switch to the Design tab in the Microsoft Visual Studio IDE to automatically update the Web.config file. Note that this information is automatically registered if you use the DevExpress Template Gallery to create a project.

Client-Side API

The ASPxCallbackPanel’s client-side API is implemented with JavaScript language and exposed by the ASPxClientCallbackPanel object.

Availability

Available by default.

| |

Client object type

ASPxClientCallbackPanel

| |

Access name

ASPxPanelBase.ClientInstanceName

| |

Events

ASPxCallbackPanel.ClientSideEvents

Overview

The following API allows you to manipulate the callback panel on the client side:

The (ASPxClientCallbackPanel.PerformCallback) method - Sends a callback to the server.
The CallbackClientSideEventsBase.BeginCallback event - Allows you to perform custom actions when a callback is sent to the server side.
The ASPxCallbackPanel.Callback event - Allows you to handle a callback on the server side.
The CallbackClientSideEventsBase.EndCallback event - Allows you to perform custom actions when a callback comes from the server side.

Use the ASPxPanelContainerBase.Controls property to access the collection of the ASPxCallbackPanel ‘s child controls.

Example

Full example - How to implement a custom loading panel for the ASPxCallbackPanel control

javascript

function OnUpdateClick(s, e) { cp.PerformCallback("Update"); }
function OnCancelClick(s, e) { cp.PerformCallback("Cancel"); }

ASPX

aspx

<dx:ASPxCallbackPanel ID="cp" runat="server" ClientInstanceName="cp" OnCallback="cp_Callback">
    <PanelCollection>
        <dx:PanelContent runat="server" SupportsDisabledAttribute="True">
            <dx:ASPxGridView ID="gv1" runat="server" DataSourceID="ads1" KeyFieldName="CategoryID" />
            <dx:ASPxGridView ID="gv2" runat="server" DataSourceID="ads2" KeyFieldName="ProductID" />
        </dx:PanelContent>
    </PanelCollection>
</dx:ASPxCallbackPanel>
<dx:ASPxButton ID="updateBtn" runat="server" Text="Update" AutoPostBack="false">
    <ClientSideEvents Click="OnUpdateClick" />
</dx:ASPxButton>
<dx:ASPxButton ID="cancelBtn" runat="server" Text="Cancel" AutoPostBack="false">
    <ClientSideEvents Click="OnCancelClick" />
</dx:ASPxButton>AutoGenerateColumns

C#
VB.NET

csharp

protected void cp_Callback(object sender, CallbackEventArgsBase e) {
    switch (e.Parameter) {
        case "Update":
            gv1.UpdateEdit();
            gv2.UpdateEdit();
            break;
        case "Cancel":
            gv1.CancelEdit();
            gv2.CancelEdit();
            break;
    }
}

Protected Sub cp_Callback(ByVal sender As Object, ByVal e As CallbackEventArgsBase)
    Select Case e.Parameter
        Case "Update"
            gv1.UpdateEdit()
            gv2.UpdateEdit()
        Case "Cancel"
            gv1.CancelEdit()
            gv2.CancelEdit()
    End Select
End Sub