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[Solved] Error on updating AJAX grid

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Datamex asked on 27 Mar 2011, 05:06 PM

Hello,

I've setup an Ajax enabled MVC grid. Inserting and deleting records work ok, updating doesn't. I use TryUpdateModel as suggested in the demo, but for some reason that returns:

"Value cannot be null.\r\nParameter name: entity"

The weird thing is that I also use TryUpdateModel on insert, and then it works fine. So I'm not sure what goes wrong on update or what I could do to find out. As a workaround, I'm now updating directly from the FormCollection parameter, but since that's hardcoded I'd rather use TryUpdateModel instead.

Here's the grid code:

<%= Html.Telerik().Grid<ApplicationCategory>()
          .Name("Grid")
          .DataKeys(keys => 
            {
              keys.Add(c => c.ApplicationCategoryId);
            })
          .ToolBar(commands => 
            {
              commands.Insert();
            })
          .DataBinding(dataBinding =>
            {
              dataBinding.Ajax()
                .Select("SelectApplicationCategories", "Admin")
                .Insert("InsertApplicationCategory", "Admin")
                .Update("UpdateApplicationCategory", "Admin")
                .Delete("DeleteApplicationCategory", "Admin");
            })
          .Columns(columns =>
            {
              columns.Bound(c => c.Name).Width(360);
              columns.Command(commands =>
              {
                commands.Edit();
                commands.Delete();
              }).Width(200);
            })
          .Editable(editing => editing.Mode(GridEditMode.InLine))
    %>

And the controller code:

    [Authorize(Roles = "Admin")]
    [GridAction]
    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult UpdateApplicationCategory(Guid id, FormCollection form)
    {
      ApplicationCategory category = adminRepository.GetApplicationCategory(id);
 
      TryUpdateModel(category);
      adminRepository.Save();
 
      //Rebind the grid            
      return View(new GridModel(adminRepository.GetApplicationCategories()));
    }

6 Answers, 1 is accepted

answered on 28 Mar 2011, 07:51 PM

Hello Atanas,

I tried the internal build, but it I'm affraid it breaks more then it does good. On a working page, I now get the following error:

"Error: Object doesn't support property or method 'tGrid'"

Grid code:

<%  Html.Telerik().Grid(Model)
          .Name("Grid")
          .DataKeys(keys =>
            {
              keys.Add(c => c.ApplicationId);
            })
          .DataBinding(dataBinding =>
            {
              dataBinding.Server()
                .Select("SelectApplications", "Admin")
                .Delete("DeleteApplication", "Admin");
            })
          .Columns(columns =>
            {
              columns.Bound(c => c.Name).Width(360);
              columns.Command(commands =>
              {
                commands.Delete();
              }).Width(200);
            })
          .Render();
    %>