[Solved] Grid does not maintain state

[psiegers45]

Hi, I haven't been able to find out why my RadGrid (used in hierarchical mode with one master/detailtable and commanditems on top (add new record)) does not maintain viewstate after adding a new record, either in mastertableview or in the detailtable. All expanded items close after rebinding occurs and I haven't been able to find out why yet.

I have seen this working in the demo page at http://demos.telerik.com/aspnet-ajax/grid/examples/dataediting/threelevel/defaultcs.aspx

I'm using Telerik Radcontrols for ASP.NET AJAX Q3 2008.

Thanks in advance for any help on this topic.
Regards, Pieter

[Schlurk]

I think that if you follow the example given in this forum post from a Telerik team member you will be able to get a solution. You should just need a bit of coding for saving / loading the expanded items :)

[psiegers45]

Thanks for the pointer Schlurk, one question, do I need to enable the grouping stuff to make it work, or can I just iterate through the items in master/detail and save expanded state in session vars?

Regards, Pieter

[Schlurk]

You should be able to just iterate through all of the items and save the expanded state in session. The example I provided was a little bit more complex so it has a bit of logic you do not need!

[psiegers45]

Very well, below is the code I have implemented today, looks like it is working so I wanted to share it with the community; if any improvements are needed along the way I'll post them too; also pls let me know if anyone finds issues with this approach.

 

        void rgDiasGastos_DataBinding(object sender, EventArgs e)
        {
            SaveGroupsExpandedState(rgDiasGastos);
        }

        void rgDiasGastos_DataBound(object sender, EventArgs e)
        {
            LoadGroupsExpandedState(rgDiasGastos);
        }

        private void SaveGroupsExpandedState(RadGrid grid)
        {
            List<int> collapsedIndexesDias = new List<int>();
            List<int> collapsedIndexesGastos = new List<int>();
            foreach (GridDataItem itemDia in rgDiasGastos.MasterTableView.Items)
            {
                if (itemDia.Expanded)
                {
                    collapsedIndexesDias.Add(itemDia.RowIndex);
                }
                foreach (GridDataItem itemGasto in itemDia.ChildItem.NestedTableViews[0].Items)
                {
                    if (itemGasto.Expanded)
                    {
                        collapsedIndexesGastos.Add(itemGasto.RowIndex);
                    }
                }
            }
            Session["groupExpandedStateDias"] = collapsedIndexesDias;
            Session["groupExpandedStateGastos"] = collapsedIndexesGastos;
        }

        private void LoadGroupsExpandedState(RadGrid grid)
        {
            List<int> collapsedIndexesDias = Session["groupExpandedStateDias"] as List<int>;
            List<int> collapsedIndexesGastos = Session["groupExpandedStateGastos"] as List<int>;
            if (collapsedIndexesDias != null)
            {
                foreach (GridDataItem itemDia in rgDiasGastos.MasterTableView.Items)
                {
                    if (collapsedIndexesDias.Contains(itemDia.RowIndex))
                    {
                        itemDia.Expanded = true;
                    }
                    if (collapsedIndexesGastos != null)
                    {
                        foreach (GridDataItem itemGasto in itemDia.ChildItem.NestedTableViews[0].Items)
                        {
                            if (collapsedIndexesGastos.Contains(itemGasto.RowIndex))
                            {
                                itemGasto.Expanded = true;
                            }
                        }
                    }
                }
            }
        }

Regards, Pieter