How to: Perform Custom Callbacks

• Aug 01, 2019

This example demonstrates how change the ASPxGaugeControl’s value using an ASPxSpinEdit.

The spin editor’s ValueChanged event is handled to call the gauge’s client-side ASPxClientGaugeControl.PerformCallback method, passing the spin editor’s value. As a result, the ASPxGaugeControl.CustomCallback event is raised, and the spin editor’s new value, specified by the e.Parameter property, is assigned to the ASPxGaugeControl.Value property. After a custom callback has been performed, the ASPxGaugeControl is automatically re-rendered.

The animation below, shows the result:

C#

protected void ASPxGaugeControl2_CustomCallback(object source,
                  DevExpress.Web.CallbackEventArgsBase e) {
    ASPxGaugeControl2.Value = e.Parameter;
}

ASPX

<dxe:ASPxSpinEdit runat="server" Number="0" Width="157px" Height="21px" ID="ASPxSpinEdit1">
    <ClientSideEvents ValueChanged="function(s, e) {
        gc.PerformCallback(s.GetValue());}">
    </ClientSideEvents>
</dxe:ASPxSpinEdit>