Treeview Issue Queries

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Hi,

I have got some issues with tree view.
My Tree View looks like this

MSIL

*****************************************

·         ABC

o   123

o   345

·         DEF

o   456

o   567

·         TYU

o   123

o   789

*****************************************

Questions:

1. When I am clicking on 123 child of TYU, the selected node parent is ABC in application. May I know why it is behaving in this way?

2. When I am selecting DEF or TYU, selection is moving to ABC itself. Any idea why this is happening.

Code:
For Populating tree:

C#

TreeNode lObjTreeNode = null;

string[] lArrTemp = null;
string lStrTemp = "";
trvRegionEnvMain.Nodes.Clear();
lStrTemp = Session[lObjClsGlobals.mStrViewStateRegionsList].ToString().Trim();
lArrTemp = lStrTemp.Split(',');
lObjTreeNode = new TreeNode("Regions And Environments");
lObjTreeNode.Value = lObjClsGlobals.CONST_STR_MAIN_TREENODE_TYPE_ROOT;
trvRegionEnvMain.Nodes.Add(lObjTreeNode);
foreach (string lStrItem in lArrTemp)
{
  lObjTreeNode = null;
  lObjTreeNode = new TreeNode(lStrItem.Trim());
  lObjTreeNode.SelectAction = treeNodeSelectAction.Select;
  lObjTreeNode.Value = lObjClsGlobals.CONST_STR_MAIN_TREENODE_TYPE_REGION;
  trvRegionEnvMain.Nodes[0].ChildNodes.Add(lObjTreeNode);
  lFnFillChildNodes(lObjTreeNode);
}

public void lFnFillChildNodes(TreeNode aObjTNode)
{
  try
  {
    ArrayList lObjArrLst = null;
    string[] lArrStrEnv = null;
    string lStrRegion = "";
    string[] lArrTemp = null;
    if (aObjTNode == null)
    {
      return;
    }
    lArrTemp = null;
    lObjArrLst = Session[lObjClsGlobals.mStrViewStateAllRegionsWithEnvList] as ArrayList;

    foreach (TreeNode lObjTN in trvRegionEnvMain.Nodes[0].ChildNodes)
    {
      if (lObjTN.Text == aObjTNode.Text)
      {
        lObjTN.Selected = true;
      }
    }
    string lStrCurrentNodeRegion = "";
    lStrCurrentNodeRegion = trvRegionEnvMain.SelectedNode.Text.Trim();
    foreach (string lStrItem in lObjArrLst)
    {
      if (lStrItem.Trim() == "")
      { continue; }
      lArrTemp = lStrItem.Split(',');
      lStrRegion = lArrTemp[0];
      if (lStrRegion.Trim() == lStrCurrentNodeRegion.Trim())
      {
        //trvRegionEnvMain.Nodes[0].ChildNodes[lIntNodeCnt].Selected = true;
        lArrStrEnv = lArrTemp[1].Trim().Split(':');
        foreach (string lStrEnv in lArrStrEnv)
        {
          string[] lArrActEnvReg = lStrEnv.Trim().Split('~');
          TreeNode lObjTreeNode = null;
          lObjTreeNode = new TreeNode(lArrActEnvReg[0].Trim());
          lObjTreeNode.SelectAction = TreeNodeSelectAction.Select;
          lObjTreeNode.Value = lObjClsGlobals.CONST_STR_MAIN_TREENODE_TYPE_ENV + "~" + lArrActEnvReg[1].Trim();
          trvRegionEnvMain.SelectedNode.ChildNodes.Add(lObjTreeNode);
        }
      }
    }
  }
  catch (Exception)
  {
    throw;
  }
}

UPDATE from OP:
Here is Treenode select change code..

C#

protected void trvRegionEnvMain_SelectedNodeChanged(object sender, EventArgs e)
      {
          try
          {
              string lStrTemp = "";
              if (trvRegionEnvMain.SelectedNode == null)
              {
                  return;
              }
              if (trvRegionEnvMain.SelectedNode.Value.Trim() == lObjClsGlobals.CONST_STR_MAIN_TREENODE_TYPE_ROOT)
              {
                  return;
              }

              if (trvRegionEnvMain.SelectedNode.Value.Trim() == lObjClsGlobals.CONST_STR_MAIN_TREENODE_TYPE_REGION)
              {

                  Session[lObjClsGlobals.mStrViewStateRegion] = trvRegionEnvMain.SelectedNode.Text.Trim();
                  Session[lObjClsGlobals.mStrViewStateOfActualEnvironment] = "";
                  if (trvRegionEnvMain.SelectedNode.ChildNodes.Count > 0)
                  {
                      Session[lObjClsGlobals.mStrViewStateOfActualEnvironment] = trvRegionEnvMain.SelectedNode.ChildNodes[0].Text.Trim();
                      lStrTemp = trvRegionEnvMain.SelectedNode.ChildNodes[0].Value.Trim();
                      if (lStrTemp.Split('~') != null)
                      {
                          Session[lObjClsGlobals.mStrViewStateForEnvandRegSplitDetails] = lStrTemp.Split('~')[1].Trim();
                      }
                  }

                  return;
              }
              string lStrTempEnv = "";
              if (trvRegionEnvMain.SelectedNode.Value.ToString().Split('~') != null)
              {
                  lStrTempEnv = trvRegionEnvMain.SelectedNode.Value.ToString().Split('~')[0];
              }
              if (lStrTempEnv.Trim() == lObjClsGlobals.CONST_STR_MAIN_TREENODE_TYPE_ENV)
              {
                                      Session[lObjClsGlobals.mStrViewStateOfActualEnvironment] = trvRegionEnvMain.SelectedNode.Text.Trim();
                  lStrTemp = trvRegionEnvMain.SelectedNode.Value.Trim();
                  if (lStrTemp.Split('~') != null)
                  {
                      Session[lObjClsGlobals.mStrViewStateForEnvandRegSplitDetails] = lStrTemp.Split('~')[1].Trim();
                  }
                  if (trvRegionEnvMain.SelectedNode.Parent != null)
                  {
                      Session[lObjClsGlobals.mStrViewStateRegion] = trvRegionEnvMain.SelectedNode.Parent.Text.Trim();
                  }

                  return;
              }
          }
          catch (Exception)
          {
              throw;
          }
      }

Posted 31-Jan-11 1:36am

Sreenath Gv

Updated 31-Jan-11 4:02am

Sandeep Mewara

v3

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Comments

shreekar 31-Jan-11 7:45am

As you yourself note, this behaviour happens when you click on the nodes. Please show the code you have written for that event.

Venkatesh Mookkan 1-Feb-11 0:24am

Post your Page Loaded event. Let me see whether you have done it properly

2 solutions

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Sreenath Gv · Answer 1 · 2011-01-31T18:06:00

Solution 3

Hi Venkat,

Thanks for reply. But I am populating tree in the same way,

Posted 31-Jan-11 18:06pm

Sreenath Gv

Comments

Venkatesh Mookkan 1-Feb-11 0:23am

Just add as a comment. Please do not post your replies as Answer. I will not get notified if you post as Answer.

Venkatesh Mookkan · Answer 2 · 2011-01-31T15:23:00

Are you loading the TreeView on the Page Loaded event? If yes, check for IsPostback before calling the load.

I see like you are loading the TreeView on the Page Loaded without any condition check. So, the TreeView is regenerated with items everytime it is loaded.

Your code supposed to be,

C#

protected void Page_Loaded (object sender, EventArgs e)
{
    if (!IsPostback)
    {
        //Your loading logic should be here.
    }
}