ASPxGridView.CustomCallback Event

Fires when you call the ASPxClientGridView.PerformCallback method and initiate a round trip to the server.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v20.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

public event ASPxGridViewCustomCallbackEventHandler CustomCallback

VB.NET

Public Event CustomCallback As ASPxGridViewCustomCallbackEventHandler

Event Data

The CustomCallback event's data class is ASPxGridViewCustomCallbackEventArgs. The following properties provide information specific to this event:

Property	Description
Parameters	Gets a string that contains specific information (if any) passed from the client side. Inherited from ASPxGridCustomCallbackEventArgs.

Remarks

The CustomCallback event allows you to process a callback on the server side after you call the client ASPxClientGridView.PerformCallback method.

You can use the ASPxGridCustomCallbackEventArgs.Parameters property to pass additional information from the client to the server side.

Note

• Don’t export the ASPxGridView’s content on a callback, because ASP.NET does not support sending binary content during a callback.
• Specify a grid’s ClientInstanceName to access its client-side equivalent.

Example

This example demonstrates how to use two ASPxGridView instances to show the master-detail data.

The master grid calls the PerformCallback(args) to send a callback to the server when a user changes a focused row. On callback, the detail grid gets data from a data source according to the selected product category in the master grid.

View Example: How to show detail information in a separate ASPxGridView

ASPX

<dx:ASPxGridView ID="gvMaster" runat="server" ClientInstanceName="masterGridView" ... >
    <ClientSideEvents FocusedRowChanged="UpdateDetailGrid" />
    ...
</dx:ASPxGridView>

<dx:ASPxGridView ID="gvDetail" runat="server" ClientInstanceName="detailGridView" OnCustomCallback="gvDetail_CustomCallback" ...>
    ...
</dx:ASPxGridView>

JS

function UpdateDetailGrid(s, e) {
    detailGridView.PerformCallback();
}

C#

protected void gvDetail_CustomCallback(object sender, DevExpress.Web.ASPxGridViewCustomCallbackEventArgs e) {
    string categoryId = gvMaster.GetRowValues(gvMaster.FocusedRowIndex, "CategoryID").ToString();
    adsProducts.SelectParameters["CategoryID"].DefaultValue = categoryId;
    gvDetail.DataBind();
}

The animation below shows the result.