Two ajax request to grid controller, when using an AjaxDropdown parent filter.

Title:

In a view, I created a Grid and a AjaxDropdown, using the prodiner example:

    Chef: @Html.Awe().AjaxDropdown("ChefList").HtmlAttributes(new { Style = "Width:200px;" })          
    <br />
        @(Html.Awe().Grid("Dinner").Columns(
                new Column { Name = "Id", Width = 55 },
                new Column { Name = "Name" },
                new Column{Name = "Date"},
                new Column{Name = "Chef.FirstName,Chef.LastName", ClientFormat = ".ChefName", Header = "Chef"}
            ).Parent("ChefList", "nChefId"))

And the controller:
        public class DinnerGridController : Controller
        {
            public ActionResult GetItems(GridParams g, int? nChefId)
            {
                // null validation, return empty model
                if (nChefId == null)
                    return Json(new { });
                
                var query = Db.Dinners.Where(o => o.Chef.Id == nChefId).AsQueryable();
    
                return Json(
                    new GridModelBuilder<Dinner>(query, g)
                    {
                        Key = "Id", // needed when using Entity Framework   
                        Map = o => new
                        {
                            o.Id,
                            o.Name,
                            o.Date,
                            ChefName = o.Chef.FirstName + " " + o.Chef.LastName
                        }
                    }.Build());
            }
        }

When I request the page in Firefox, I get two consecutive Ajax Request to the GridController, the first one with the ‘nChefId’ equals to null, and the second one with the correct Dropdown value.
I put a null validation in the GridController, but I get a javascript error in AwesomeMvc.js

_TypeError: t is undefined
http://localhost:43993/Scripts/AwesomeMvc.js
Line 1
function(n,t){ei(t)&&ki++});sr.empty();t.Groups&&(ct=0);ct&&sr.append(li(t,0,0,0..._

This behavior started when I updated to version 4.7.3., in later versions the grid controller is called only once with the correct dropdown value.

Intersel

asked at 30 Sep 2015

in the grid GetItems action you should always return the result of GridModelBuilder.Build even if the items is an empty collection, to get just one request give the AjaxDropdown a value (.Value)

at 30 Sep 2015 Omu
Thanks for your help!

at 30 Sep 2015 Intersel

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