Ajax Binding doesn't work (Cannot use 'in' operator to search for 'HasSubgroups')

[Keivan Beigi]

When I try to bind a grid using ajax, I get the wait icon spinning. It doesn't stop and no data is shows. fiddler shows that the data was sent to the client.

HTTP/1.1 200 OK
Server: Cassini/4.0.1.8
Date: Sat, 02 Oct 2010 19:47:30 GMT
X-AspNet-Version: 4.0.30319
X-AspNetMvc-Version: 2.0
Cache-Control: private
Content-Type: application/json; charset=utf-8
Content-Length: 44
Connection: Close

{"data":["adaw","awdadw","awdad"],"total":3}

looking at inspect section of Chrome shows this error.

Uncaught TypeError: Cannot use 'in' operator to search for 'HasSubgroups' in adaw
a.grid.bindTotelerik.grid.min.js:1
a.grid.dataBindtelerik.grid.min.js:1
a.grid.ajaxOptions.e.successtelerik.grid.min.js:1
c.extend.proxy.bjquery-1.4.2.min.js:32
bjquery-1.4.2.min.js:124
c.extend.ajax.g.x.onreadystatechangejquery-1.4.2.min.js:129

Html.Telerik().Grid<String>(Model).Name("UnmappedGrid").
    Columns(columns => columns.Bound(o => o).Title("Folder"))
    .Sortable(sort => sort.OrderBy(order => order.Add(o => o).Ascending()).Enabled(false))
    .DataBinding(dataBinding => dataBinding.Ajax().Select("_ajaxUnmapped", "Series"))
    .Render();

[GridAction]
public ActionResult _ajaxUnmapped()
{
    return View(new GridModel<String>
    {
        Data = new List<String> { "adaw", "awdadw", "awdad" }
    });
}

[Atanas Korchev]

Hello Keivan Beigi,

 The result which you return is not supported by the grid. Please check the ajax binding help topic or the online example which show how to properly configure the grid for ajax binding.

Regards,
Atanas Korchev
the Telerik team

[Keivan Beigi]

Thanks for the response Athanes. I have read the Ajax guide a few a times and my code is exactly from the demo site. As you can see the data I'm returning is simply an array of strings. Would you be able to give me a bit of more hints. Is it the binding that is wrong? Is it the model? am I missing an step somewhere?

[Atanas Korchev]

Hi Keivan Beigi,

 I investigated the case thoroughly and found that the grid currently cannot bind to array of primitive objects (string, number etc). I fixed that problem and I am attaching the updated JavaScript file. Replace the original telerik.grid.min.js with the one attached.

Regards,
Atanas Korchev
the Telerik team

[Keivan Beigi]

Thanks a lot, is this fix something that will be included in the next release? if not i rather change the model rather than having to maintain a custom version of the script file.


Thanks,

[Jon Smith]

Hi,

I too am trying to bind to a list of primitive objects, in this case strings. Can I check whether the fix given here is in the latest release of the MVC code?

Thanks