Internet Explorer Web Controls

Re: Looping through TreeView Nodes?

darkcat02 — Mon, 23 Mar 2009 07:46:32 GMT

hi there...

can you give me an example how did you execute those functions? i need it badly.. thanks a lot...

Re: Looping through TreeView Nodes?

asmvax — Sun, 25 Nov 2007 12:28:27 GMT

i've made some changes in your code:

you will call with SelectNodesRecursive(what node to select ex:"10", name of the treeview ex: treeview1);

public static void SelectNodesRecursive(string searchValue,TreeView Tv)
    {
        foreach (TreeNode tn in Tv.Nodes)
        {
            if (tn.Value == searchValue)
            {
                tn.Expand();
                tn.Select();
                break;
            }

            if (tn.ChildNodes.Count > 0)
            {
                foreach (TreeNode cTn in tn.ChildNodes)
                {
                    int a = SelectChildrenRecursive(cTn, searchValue);
                    if (a == 1)
                    {
                        tn.Expand();
                    }
                }
            }
        }
    }

    private static int SelectChildrenRecursive(TreeNode tn, string searchValue)
    {
        if (tn.Value == searchValue)
        {
            //if(tn.Parent.Parent!=null)
            //{
            // tn.Parent.Parent.Expand();
            //}
            //if (tn.Parent != null)
            //{
            //    tn.Parent.Expand();
            //}

            tn.Expand();
            tn.Select();
            return 1;
        }
        else
        {
            // tn.Parent.Collapse();
            tn.Collapse();
        }
        if (tn.ChildNodes.Count > 0)
        {
            foreach (TreeNode tnC in tn.ChildNodes)
            {
                int a = SelectChildrenRecursive(tnC, searchValue);
                if (a == 1)
                {
                    tn.Expand();
                    return 1;
                }

            }

        }
        return 0;
    }

Re: Looping through TreeView Nodes?

Rupen Shah — Mon, 12 Nov 2007 21:56:11 GMT

I found that there is a property in the treeview CheckedNodes which gives list of nodes that are checked. Is there a opposite property which gives unchecked nodes from the treeview?

Re: Looping through TreeView Nodes?

bsharp3 — Sat, 10 Nov 2007 00:42:04 GMT

Here's a couple of subs I put together to loop through all treenodes. I had to loop through the tree for a node with a specific value to select and expand it. hope this helps.

Private Sub RecurseNodes(ByVal searchValue As Integer)

For Each tn As TreeNode In TreeView1.Nodes

If tn.Value = searchValue Then

tn.Expand()

tn.Select()

Exit For

End If

If tn.ChildNodes.Count > 0 Then

For Each cTn As TreeNode In tn.ChildNodes

recurseChildren(cTn, searchValue)

End If

End Sub

Private Sub recurseChildren(ByVal tn As TreeNode, ByVal searchValue As Integer)

If tn.Value = searchValue Then

tn.Expand()

tn.Select()

Exit Sub

End If

If tn.ChildNodes.Count > 0 Then

For Each tnC As TreeNode In tn.ChildNodes

recurseChildren(tnC, searchValue)

End If

End Sub

Looping through TreeView Nodes?

andrea_johnson — Tue, 11 Sep 2007 16:35:33 GMT

Hello,

I'm using the Microsoft Web Control. I'm dynamically loading the control with data from the database where there are parent nodes and children nodes that could be up to 5 levels. I have a Javascript function that executes when a parent node is checked to automatically select all the children below it. Now I have to figure out a way to find out what nodes are selected so that I can process them properly. The only way I see this happening is if I create a hidden variable and loop through all the nodes in the TreeView and add the nodes to the variable if they are checked. However, I'm having a problem looping though the nodes. The only information I found was the SelectNodeIndex property which just gives me the node that was selected.

This is my TreeView Format:

Folder10

Folder1

Item1

Folder2

Item2

Folder 11

Folder 3

Item4
Item5

Folder 12

Folder4

Folder5

Folder6

Item6

Folder 13

Item7

I need to find out which Item was selected in the TreeView. So lets say that I checked the Folder10 and Folder12 (all the subfolders and items are selected automatically). Then I want the hidden variable to hold all the selected nodes in this format;

Variable = Folder10_1_item1 (So the each parent node selected would start of with text "Folder" then the ID of the folder, then an "_" which means there is a child. Then the ID of the subFolder and then the text "item" and then the ID)

So If I selected Folder10 and Folder12 in the TreeView, I would like the variable to hold this information

Variable = Folder10_1_item1;Folder10_2_item2;Folder12_4_5_6_Item6

Can someone please help? How can I loop through each node of the treeview to achieve this.

Thank you