Grid Group Problem

[fareedha]

Hi,

I have implemented grouping feature for my rad grid. I set by default ExpandGroup as false so the all grouped cols are collapsed after grid loaded.
After that i did expanded some group columns and fortunately a button is clicked in then page and postback occurs. after post back again those grouped columns are collapsed. but i need those expanded items to be maintained.

Please give the solution to solve this issue. hope my explanation reaches the problem i am facing,

thanks

[Princy]

Hello Fareedha,

You can try the following code snippet to achieve this.

C#:

protected void RadGrid1_ItemCommand(object source, GridCommandEventArgs e)
   {
       ArrayList expandedItems;
       if (Session["expandedItems"] == null)
       {
           expandedItems = new ArrayList();
       }
       else
       {
           expandedItems = (ArrayList)Session["expandedItems"];
       }
       if (e.CommandName == "ExpandCollapse" )
      {
           GridGroupHeaderItem headerItem = (GridGroupHeaderItem)e.Item;
           if (!headerItem.Expanded)
           {
               string groupIndex = Convert.ToString(headerItem.GroupIndex);
               expandedItems.Add(groupIndex);
               Session["expandedItems"] = expandedItems;
           }
           else
           {
               string groupIndex = Convert.ToString(headerItem.GroupIndex);
               expandedItems.Remove(groupIndex);
               Session["expandedItems"] = expandedItems;
           }
       }

   }
   protected void RadGrid1_PreRender(object sender, EventArgs e)
   {
       if (Session["expandedItems"] != null)
       {
           ArrayList expandedItems = (ArrayList)Session["expandedItems"];
           Int16 stackIndex;
           for (stackIndex = 0; stackIndex <= expandedItems.Count - 1; stackIndex++)
           {
               string curItem = expandedItems[stackIndex].ToString();
               foreach (GridGroupHeaderItem item in RadGrid1.MasterTableView.GetItems(GridItemType.GroupHeader))
               {
                   if (curItem.Equals(item.GroupIndex.ToString()))
                       {
                           item.Expanded = true;
                           break;
                       }
                }
           }
       }
   }

Also please take a look at the following Code Library which illustrates how to persist group expanded state on rebind.
Persist Groups Expanded State on Rebind

Thanks,
Princy

[fareedha]

i need a solution from the client side script. i set the grouploadmode='client'.when i postback grid in collapsed mode and i cant maintain the expandedgroupitems state.
if u have a solution please reply...


thanks in advance....

[Maria Ilieva]

Hi,

We do not suggest maintaining the group expanded state on the client. I would suggest you to refer to the following code libraries for more information on this matter:
Persist Groups Expanded State on Rebind
http://www.telerik.com/community/code-library/aspnet-ajax/grid/retain-expanded-selected-state-in-hierarchy-on-rebind.aspx

Sincerely yours,
Maria Ilieva
the Telerik team