[Solved] Grid selection lost on postback

[CBARS]

Hi

I have a RadGrid being filled from an ObjectDataSource. I've enabled client side selection, and EnablePostBackOnRowClick. The RadGrid is also added to a RadAjaxManager. It is set to update a Panel on the same page that contains some Label controls. I'm handling the ItemCommand eventhandler of the RadGrid and then checking if the RowCommand == "RowClick". All this works pretty well.

However, when the update takes place, and the Label controls are filled, the RadGrid loses its selection. I'm only selecting one row at a time.

How can I have the row selection persist through the postback?

[Princy]

Hello cbars,
In order to persist the client selection across postback or ajax requests, you need to ensure that viewstate is enabled for your selectable grid.
Princy.

[CBARS]

EnableViewState is true. I haven't changed it from the default, and I specified it explicitly in the RadGrid tag.

Still loses the selection.

[Daniel]

Hello Marcel,

Depending on your scenario these articles may be helpful:
Persisting the selected rows client-side on sorting/paging/filtering/grouping
Persisting the selected rows server-side on sorting/paging/filtering/grouping

Regards,
Daniel
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[CBARS]

Thanks for those articles... Had a look at them, and used the principle that is discussed there (save the selected items in a session variable, repopulate after postback).

Since I only want one item selected, I have this code in my ItemCommand handler :

appID = Convert.ToInt32(RadGrid1.SelectedValue); Session["selectedItem"] = appID;

and this in my PreRender handler :

if (Session["selectedItem"] != null)
            {
                int selecteditem = int.Parse(Session["selectedItem"].ToString());
                foreach (Telerik.Web.UI.GridItem item in RadGrid1.MasterTableView.Items)
                {
                    if (item is Telerik.Web.UI.GridDataItem)
                    {
                        Telerik.Web.UI.GridDataItem dataItem = (Telerik.Web.UI.GridDataItem)item;

                        if (dataItem.OwnerTableView.DataKeyValues[dataItem.ItemIndex]["ID"].ToString() == selecteditem.ToString())
                        {
                            dataItem.Selected = true;
                            break;
                        }
                    }
                }
            }

When I follow the code, one of the items' Selected property is set to true, but on the page it isn't selected.

[CBARS]

Ended up using the client side solution in the article. Couldn't get the server side solution going... Some JavaScript, no problem though.

Thanks.

[Frank]

Got it: Adding (bold line)
    <telerik:RadGrid ID="RadGrid1" runat="server"
        DataKeyValues="Id"
    </telerik:RadGrid>
to RadGrid does the Trick, so the selected Item DataKey (Field "Id") will be stored as selectedItem.