Passing results and ModelState Errors - grid does not bind result set...

[Jim.Mills]

I have a situation where I need to pass a message to be displayed along with the data for a grid.  I am attempting to do this in the _Read action (ajax).  I tried to place the message in ModelState, however, when I processed the error and pulled out the message, the grid did not bind the data that was sent.  Is there a way to pass additional data down to the client similar to passing additional data up to the client?

I did have a solution, where I set a property value on the first row and the client checked for that value and put up a message, but that only worked when there were results available to display - I may not send any data back (empty result set).

Thanks.

[Petur Subev]

Hello Jim,

Basically this is not supported out-of-the-box. However you can extend the DataSourceResult and add additional field.

e.g.

public ActionResult GetPeople([DataSourceRequest] DataSourceRequest dsRequest)
{
    var dsResult = people.ToDataSourceResult(dsRequest);
    var result = new
    {
        dsResult.AggregateResults,
        dsResult.Data,
        dsResult.Errors,
        dsResult.Total,
        myMessage = "This message is retrieved from the server"
    };
    return Json(result);
}

On the client side you can use the requestEnd event of the dataSource to access that field send from the server.
e.g.

@(Html.Kendo().Grid<KendoMVCWrappers.Models.Person>().Name("people")

    .DataSource(dataSource => dataSource

        .Ajax()

            .Model(model => {

                model.Id(m => m.PersonID);

                model.Field(f => f.Name).Editable(false);

            })

            .Events(ev=>ev.RequestEnd(@"

                    function(e){

                        if(e.type=='read'){

                            alert(e.response.myMessage)

                        }

                    }"

                ))
//...

I hope this helps.

Kind Regards,
Petur Subev
Telerik