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MVCxClientGridView.BeginCallback Event

Occurs when a callback for server-side processing is initiated.

Declaration

BeginCallback: ASPxClientEvent<MVCxClientBeginCallbackEventHandler<MVCxClientGridView>>

Event Data

The BeginCallback event handler receives an argument of the MVCxClientBeginCallbackEventArgs type. The following properties provide information specific to this event.

Property Description
command Gets a command name that identifies which client action forced a callback to occur.
customArgs Gets an object containing specific information (if any, as name/value pairs) that should be passed as a request parameter from the client to the server side for further processing.

Remarks

The BeginCallback and ASPxClientGridView.EndCallback events can be used to perform specific client-side actions (for example, to display and hide an explanatory text or picture) while a callback is being processed on the server side.

By handling the BeginCallback event, you can pass any required information from the client to the server via the MVCxClientBeginCallbackEventArgs.customArgs property.

Examples

The example covers the following topics:

  • the GridView extension is bound to a DataSet that is filtered by external editors;
  • when a callback is performed, the grid's ASPxClientGridView.BeginCallback event is handled. In the MVC GridView extension, it is possible to transmit client-side values as callback arguments to a Controller's Action, returning a Partial View;
  • jQuery asynchronous requests are not able to serialize the Date, and thus the serialization should be performed manually;
  • a DateTime object is created from a serialized string using the DateTime.ParseExact method;
  • custom resources (scripts and CSS files) are compressed using the HTTP Handler as demonstrated in the How to compress and merge custom CSS and JavaScript files using ASPxHttpHandlerModule example.

The complete sample project is available in the DevExpress Code Central database at Code central example E3096.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Example.Models;
using System.Web.Script.Serialization;
using System.Globalization;

namespace Example.Controllers {
    public class HomeController : Controller {
        public ActionResult Index() {
            //default data
            OrdersModel model = new OrdersModel {
                StartDate = new DateTime(1996, 8, 1),
                EndDate = new DateTime(1996, 8, 30)
            };

            return View(model);
        }

        [HttpPost]
        public ActionResult GridViewPartial() {
            OrdersModel model = new OrdersModel {
                StartDate = DateTime.ParseExact(Request.Params["StartDate"], "d|M|yyyy", CultureInfo.InvariantCulture),
                EndDate = DateTime.ParseExact(Request.Params["EndDate"], "d|M|yyyy", CultureInfo.InvariantCulture)
            };

            return PartialView("_GridView", model.Data);
        }
    }
}
See Also