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ajax binding and FilterDescriptors problem
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xu
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xu asked on 13 Dec 2011, 01:18 PM
when i use ajax binding  and filter in my grid, i can,t get the FilterDescriptors in my controller.
the view:
@(Html.Telerik().Grid<UserModel>(Model.UserModels.Data)
                .Name("user-list")
               
                .Columns(columns =>
                {
                    columns.Bound(x => x.Username).Width(50).Filterable(false);
      
                })
           .DataBinding(dataBinding => dataBinding.Ajax().Select("Refresh", "User"))
           .Filterable(filtering => filtering.Filters(filters =>
           {
               // username
               if (!String.IsNullOrEmpty(ViewData["searchUsername"] as string))
               {
                   filters.Add(x => x.SearchUsername).Contains((string)ViewData["searchUsername"]);
               }
           }))
                .Pageable(settings => settings.Total(Model.UserModels.Total).PageSize(1).Position(GridPagerPosition.Both))
                .EnableCustomBinding(true)
                )
and the controller:
[HttpPost, GridAction(EnableCustomBinding = true)]
        public ActionResult Refresh(GridCommand command)
        {
            string searchUsername = command.FilterDescriptors.GetValueFromFilters("searchUsername");
            var users = _accountService.GetUsers(searchRoleIds.ToArray(), searchUsername, command.Page - 1, command.PageSize);
            var gridModel = new GridModel<UserModel>
            {
                Data = users.Select(u => { return Map(u); }),
                Total = users.TotalCount
            };
            return new JsonResult
            {
                Data = gridModel
            };
        }
the problem is the command.FilterDescriptors.count always is 0. but i turely add the "searchUsername"into the FilterDescriptors
,is it a bug?
and it's the same problem at http://www.telerik.com/community/forums/aspnet-mvc/grid/bug-initial-filter-with-ajax-binding.aspx

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Petur Subev
Telerik team
answered on 14 Dec 2011, 11:44 AM
Hello Xu,

You can set the ActionParameterName in the controller's GridAction attribute so it matches the name of the parameter in the Action's signature
e.g.

[GridAction(ActionParameterName ="command",EnableCustomBinding=true)]
        public ActionResult Refresh(GridCommand command)

I hope this helps.

Best wishes,
Petur Subev
the Telerik team
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xu
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answered on 15 Dec 2011, 02:43 AM
thank you!

but it does't work.
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Petur Subev
Telerik team
answered on 16 Dec 2011, 03:28 PM
Hello Xu,

As examining your code I noticed that you are using Custom Ajax binding and also you initially populate the Grid by passing a collection to the constructor. Doing so wont trigger the custom binding in your select Grid Action since the Action method is not being called the first time.
I attached a demo project which implements a Grid using custom Ajax binding and successfully  retrieves the filter descriptors in the action method.
If this doesn't help you to find out where the problem comes, please reproduce the scenario by modifying the attached project and send it back so we can check it.

Kind regards,
Petur Subev
the Telerik team
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xu
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answered on 19 Dec 2011, 09:28 AM
thanks you very much!!
i send my project and have remove any insignificant code, so you can find the problem easily .
now use any  username which does not exist to search will get the problem.

thank you for your patient reply!
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Petur Subev
Telerik team
answered on 20 Dec 2011, 03:46 PM
Hello Xu,

You are unable to receive this filter descriptor because the property you apply to is not bound to a column.
To make things work you can add a hidden column bound to this property.
e.g.

//..
.Columns(columns =>
                {
                    columns.Bound(x => x.SearchUsername).Hidden(true);
//..



All the best,
Petur Subev
the Telerik team
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xu
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answered on 21 Dec 2011, 06:25 AM
thank you!!!, it solves!
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