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Trying to Collapse the Level==0 Nodes

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Bob
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Bob asked on 06 Apr 2010, 03:57 PM
Hello, i think i've tried just about every option i can find to Collapse the ChildNodes of the Level==0 parent i suspect that 
is has something to do with the fact that i'm not actually using the " e " in e.Nodes.... to try and do the actual process
but i'm trying to use the actual RadTreeView ID collection itself, but the reason i'm doing that is because i want to Collapse 
all of the Level 0 AAAA node when i then select the Level 0 BBBB node for instance, so if i tried to use the " e " value
i would be pointing to the BBBB node which i what i want to expand, but before i expand it, i want to Collapse the AAAA node 
just for example. thanks for any ideas or suggestins! 

   protected void trvDB2_NodeExpand(object sender, RadTreeNodeEventArgs e)  
    {  
        foreach (RadTreeNode rtn in trvDB2.Nodes)  
        {  
            if (rtn.Level == 0 && !e.Node.Text.Equals(rtn.Text))  
            {   
                int    rntnc = rtn.Nodes.Count;  
                //Nodes   ns = rtn.Nodes.Remove();  
                //for (int index = rtn.Nodes.Count - 1; index >= 0; index--)  
                for   (int index = rtn.Nodes.Count - 1; index >= 0; index--)  
                {  
                    //string rtnrtntxt0 = rtn.Nodes[index].Text;  
                    //if (rtn.Nodes[index].Level==1)  
                    //{  
                    //    //string rtnrtntxt = rtn.Text;  
                    //    //string rntnit = rtn.Nodes[index].Text;  
                    //    rtn.Nodes.Clear();  
                    //    //rtn.Nodes[index]  
                    //    //rtn.Nodes[index];  
                    //    //rtn.Nodes  
                    //}  
                }  
                //string x = rtn.Text;  
                //IEnumerator ie =  rtn.Nodes.GetEnumerator();  
                //while (ie.MoveNext())  
                //{  
                //    ((RadTreeNode)(ie.Current)).Nodes.Clear();  
                //}  
                //foreach (RadTreeNode rtn2 in rtn.Nodes)  
                //{  
                //     //string r = rtn 
                //     //rtn2.Nodes.Clear();  
                //     //rtn2.c  
                //     //rtn2.Nodes.Clear();  
                //     //rtn.Nodes.Remove(rtn2);  
                //}  
                //rtn.Nodes.Remove();  
                //rtn.CollapseChildNodes();  
                //rtn.CollapseParentNodes();  
            }  
        }  
        for (int index = trvDB2.CheckedNodes.Count - 1; index >= 0; index--)  
        {  
            //trvDB2.CheckedNodes[index].Checked = false;  
        }  
        for (int index = trvDB2.Nodes.Count - 1; index >= 0; index--)  
        {  
            string trvnodetxt = trvDB2.Nodes[index].Text;  
            if (trvDB2.Nodes[index].Level == 0 && !e.Node.Text.Equals(trvnodetxt))  
               {  
                   trvDB2.Nodes[index].CollapseChildNodes();  
                   trvDB2.Nodes[index].Nodes.Clear();  
                   trvDB2.Nodes[index].Remove();  
               }  
        }  
        //e.Node.CollapseChildNodes();  
        //e.Node.CollapseParentNodes();  
        //PopulateNodeOnDemand(e, TreeNodeExpandMode.ServerSideCallBack);  
    } 

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Yana
Telerik team
answered on 08 Apr 2010, 12:35 PM
Hello,

If you're using ExpandMode="ServerSideCallBack" for the nodes, you cannot modify the other nodes in NodeExpand event handler  - the reason for this is that you make a callback to the server and only new nodes can be added to the expanded node. You should either use ExpandMode="ServerSide" or collapse the other nodes on the client.

All the best,
Yana
the Telerik team

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Bob
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answered on 11 Apr 2010, 03:48 AM
great that was the solution Yana, thanks alot!
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