Treeview node not expanding on clicking on text

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Hi,

I have a tree view in which there are two child nodes with parentID 0 and a main node with no ID.

Root Node
0--> Child 1
1--> SubChilds
3--->SubChild1
1--> Subchilds
0--> Child 2
2--> SubChilds
2--> SubChilds

The tree structure is as above. The problem is that whenever I click on Child 2 the Child 1 node gets expanded, I have checked using breakpoints and found out that whenever I click on Child 2 the sleectednode.text shows Child 1. How can I clear this?

A piece of the code is given below :

------------------------------------------------

C#

Treeview1_SelectedNodeChanged()
{
Datatable dt = //Treeview binding
ds.tables.add(dt);
TreeNode selectedNode = New TreeNode();
selectedNode = this.Treeview1.SelectedNode.Text;
}

------------------------------------------------

Here selectedNode always shows the text of the first Child node even if I click on the second Child Node. I am binding the tree from the SQL table using a datatable.

Thank & Regards,
SaJ

Posted 3-Sep-15 20:35pm

SajinAboo

Updated 3-Sep-15 23:10pm

v2

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Comments

Abdul Samad KP 4-Sep-15 5:24am

Why are you binding tree view in Selected node changed event?
Because of this, the selection is resting, that is why you are always getting first node.
By the way , why are you assigning a text to a tree node?

SajinAboo 4-Sep-15 5:29am

Hi
Inside the selected node changed event i have created a method for binding a gridview, the grid view is binded based on the selected node's ID. After that only i have called the expansion code... Let me check if that was the issue.

Thanks & Regards,
SaJ

SajinAboo 4-Sep-15 5:35am

Hi,

I have checked with that solution, but still it shows the same problem. Inside the Selected node changed event I have given
TreeView1.SelectedNode.Expand(), but the selected node shows the value of first child node not the node which I clicked...

Thanks & Regards,
SaJ

Abdul Samad KP 4-Sep-15 5:42am

When are you binding the tree?
Inside page load?

SajinAboo 4-Sep-15 5:46am

Yes, the treeview binding is done on page load.
I have created a method for creating the parent node and child node, the treeview works fine when the + sign is clicked, but upon selecting a child it always returns the value of the first child node.

Abdul Samad KP 4-Sep-15 5:50am

Page load event is fired when a post back occurs, so pls check you have placed your treeview binding code inside a if(!IsPostback) checking

SajinAboo 4-Sep-15 5:58am

I checked that,
I have changed the code and given

bidnGridWithTree()

{

TreeNode selectedNode = New TreeNode();

selectedNode.Value = this.TeeView1.SelectedNode.Value;

LoadGird(Convert.toInt32(selectedNode.Value));

}

And in the

TreeView1.SelectedNodeChanged()

{

TreeView1.SelectedNode.Expand();

bidnGridWithTree();

}

But the TreeView1.SelectedNode.Expand(); selectedNode always shows the firstchild even if i click on the second child. On clicking other leaf nodes of Second Child it expands fine.

SaJ

Abdul Samad KP 4-Sep-15 6:05am

Pls post your treeview binding code and code in the page load event

SajinAboo 4-Sep-15 6:21am

PageLoad()
{
(!IsPostBack)
{
this.GetParentNodes();
}
}

public void GetParentNodes()
{
try
{
TreeNode topNode = New TreeNode();
topNode.Text = "Reference Document";
topNode.Value = "0";
topNode.SelectAction = TreeNodeSelectAction.SelectExpand();
topNode.CollapseAll();
TreeView1.Nodes.Add(topNode);
DataTable dt = obj.SelectDocument("DocumentId");
ds.Tables.Add(dt);
ds.Relations.Add("ChildRow",ds.Tables[0]Columns["Id"],ds.Tables[0]Columns["ParentId"],
false);
foreach(DataRow firstDataRows in ds.Tables[0]Rows)
{
if(Convert.toInt32(firstDataRows["ParentId"] == 0)
{
TreeNode parentTreeNode = New TreeNode();
parentTreeNode.Text = firstDataRows["FolderName"].ToString();
parentTreeNode.Value = firstDataRows["ParentId"].ToString();
parentTreeNode.SelectAction = TreeNodeSelection.SelectExpand();
parentTreeNode.CollapseAll();
parentTreeNode.Selected = True;
topNode.ChildNodes.Add(parentTreeNode);
GetChildNodes(firstDataRows,parentTreeNode);
}

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Abdul Samad KP · Accepted Answer · 2015-09-04T01:09:00

Solution 1

This happens because your treenodes have duplicate values, change the line

parentTreeNode.Value = firstDataRows["ParentId"].ToString();

to

parentTreeNode.Value = firstDataRows["Id"].ToString();

So that they will have unique values

Posted 4-Sep-15 1:09am

Abdul Samad KP

Comments

SajinAboo 4-Sep-15 7:22am

Also should i change it for the Child row method???

SajinAboo 4-Sep-15 7:36am

Thank you, That worked like a charm...