ASPxGaugeControl.CustomCallback Event
Fires when a round trip to the server has been initiated by a call to the client ASPxClientGaugeControl.PerformCallback method.
Namespace: DevExpress.Web.ASPxGauges
Assembly: DevExpress.Web.ASPxGauges.v24.2.dll
NuGet Package: DevExpress.Web.Visualization
#Declaration
public event CallbackEventHandlerBase CustomCallback
#Event Data
The CustomCallback event's data class is CallbackEventArgsBase. The following properties provide information specific to this event:
Property | Description |
---|---|
Parameter | Gets a string that contains specific information (if any) passed from the client side. |
#Remarks
The CustomCallback event allows any desired server-side processing to be performed in response to a call to the client ASPxClientGaugeControl.PerformCallback method.
Use the CallbackEventArgsBase.Parameter property to get the information passed from the client side.
If you need to perform actions on the client-side before and after callback processing, handle the ASPxClientGaugeControl.BeginCallback and ASPxClientGaugeControl.EndCallback events.
After a custom callback has been performed, the ASPxGaugeControl is automatically re-rendered.
Note
- Changing the settings of other controls contained on the page has no effect, because a custom callback only contains information about the ASPx
Gauge Control.
#Example
This example demonstrates how change the ASPxGaugeControl’s value using an ASPxSpinEdit.
Handle the spin editor’s ValueChanged event to call the gauge’s client-side ASPxClientGaugeControl.PerformCallback method. Pass the spin editor’s value as a parameter. 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:
protected void ASPxGaugeControl2_CustomCallback(object source,
DevExpress.Web.CallbackEventArgsBase e) {
ASPxGaugeControl2.Value = e.Parameter;
}