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Treeview from database

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Greg

Anyone have examples on how to pull a treeview from a database, with the
database containing the parent and child node ID's?

Thanks
Greg

Reply to this message...

James Avery

Try this out Greg:

http://www.aspalliance.com/jamesavery/webcontrols/treeviewp2.aspx

James

-----Original Message-----
From: Greg [mailto:Click here to reveal e-mail address]
Sent: Friday, June 28, 2002 12:19 PM
To: aspngwebcontrols
Subject: [aspngwebcontrols] Treeview from database

Anyone have examples on how to pull a treeview from a database, with the
database containing the parent and child node ID's?

Thanks
Greg

Reply to this message...

Michael S. Hunsicker

Hi Greg,

Here is the code behind for a treeview that loads parent and child node
information from a database. It can handle any level of nesting (for the
"category" node) specified by the retrieved data. I built this for a data
structure designed specifically to deal with child-parent relationships; if
you're interested I can send you more information on the data structure.
This probably isn't the most efficient approach, but it works well and loads
pretty fast.

Hope this helps,
Mike

------------------
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
If Not (IsPostBack) Then
GetTreeData()
BuildTree()
End If
End Sub

Private Sub GetTreeData()
'retrieve groups
sqlCmd = New SqlCommand("select group_oid [id], name [desc] from
tb_group", sqlCn)
sqlDA = New SqlDataAdapter(sqlCmd)
sqlDA.Fill(dsGroups, "Group")

'retrieve top level categories
sqlCmd = New SqlCommand("sp_tb_get_top_categories", sqlCn)
sqlCmd.CommandType = CommandType.StoredProcedure
sqlDA = New SqlDataAdapter(sqlCmd)
sqlDA.Fill(dsTCat, "Category")

'retrieve all nested parent categories
sqlCmd = New SqlCommand("sp_tb_get_categories", sqlCn)
sqlCmd.CommandType = CommandType.StoredProcedure
sqlDA = New SqlDataAdapter(sqlCmd)
sqlDA.Fill(dsCats, "Categories")

'retrieve all published models
sqlCmd = New SqlCommand("sp_tb_get_models_all", sqlCn)
sqlCmd.CommandType = CommandType.StoredProcedure
sqlDA = New SqlDataAdapter(sqlCmd)
sqlDA.Fill(dsModels, "Models")
End Sub

Private Sub BuildTree()
' set tree properties
With tv
.EnableViewState = True
.AutoPostBack = True
.SelectExpands = True
With .DefaultStyle
.Add("font-size", "12")
.Add("font-family", "Arial")
End With
End With

' build nodes
Dim sId As String
Dim drs() As DataRow = dsGroups.Tables("Group").Select()
Dim dr As DataRow
For Each dr In drs
Dim ParentNode As New TreeNode()
With ParentNode
.Type = "Group"
.Text = dr.Item("desc").ToString
.ID = dr.Item("id").ToString
With .DefaultStyle
.Add("width", "98%")
.Add("background-color", "#eeeeee")
.Add("border", "solid 1px #777777")
.Add("padding", "1px")
End With
End With

'add root level child nodes to group node
AddTopChild(ParentNode, dr.Item("id").ToString)

'add group node to treeview
tv.Nodes.Add(ParentNode)
Next
End Sub

Private Sub AddTopChild(ByRef ParentNode As TreeNode, ByVal ParentId As
String)
Dim drs As DataRow() = dsTCat.Tables("Category").Select()
Dim dr As DataRow
If drs.GetLength(0) > 0 Then
For Each dr In drs
If dr.Item("parent") = ParentId Then
Dim TopChildNode As New TreeNode()
Dim sDesc As String = dr.Item("desc").ToString
Dim sId As String = dr.Item("id").ToString
With TopChildNode
.Type = "Category"
.Text = sDesc
.ID = sId
.DefaultStyle.Add("color", "maroon")
End With

'add models to root level child nodes
AddModels(TopChildNode, sId)

'add children to root level child nodes
AddChildren(TopChildNode, sId)

'add root level child node to group node
ParentNode.Nodes.Add(TopChildNode)
End If
Next
End If
End Sub

Private Sub AddChildren(ByRef ParentNode As TreeNode, ByVal sParentId As
String)
Dim drs As DataRow() = dsCats.Tables("Categories").Select()
Dim dr As DataRow
If drs.GetLength(0) > 0 Then
For Each dr In drs
If dr.Item("parent") = sParentId Then
Dim ChildNode As New TreeNode()
Dim sDesc As String = dr.Item("desc").ToString
Dim sId As String = dr.Item("id").ToString
Dim sType As String = "Category"
With ChildNode
.Type = "Category"
.Text = sDesc
.ID = sId
.DefaultStyle.Add("color", "maroon")
End With

'add models to child node
AddModels(ChildNode, sId)

'add child to root level child node
ParentNode.Nodes.Add(ChildNode)

'call AddChildren for each child to recursively add all
children
AddChildren(ChildNode, sId)
End If
Next
End If
End Sub

Private Sub AddModels(ByRef ParentNode As TreeNode, ByVal sParentId As
String)
Dim drs As DataRow() = dsModels.Tables("Models").Select()
Dim dr As DataRow
If drs.GetLength(0) > 0 Then
For Each dr In drs
If dr.Item("parent") = sParentId Then
Dim ModelNode As New TreeNode()
Dim sDesc As String = dr.Item("desc").ToString
Dim sId As String = dr.Item("id").ToString
With ModelNode
.Type = "Model"
.Text = sDesc
.ID = sId
.DefaultStyle.Add("font-style", "italic")
.ImageUrl = sImagesPath & "\addNote.gif"
End With

'add model to child node
ParentNode.Nodes.Add(ModelNode)
End If
Next
End If
End Sub

-----Original Message-----
From: Greg [mailto:Click here to reveal e-mail address]
Sent: Friday, June 28, 2002 11:19 AM
To: aspngwebcontrols
Subject: [aspngwebcontrols] Treeview from database

Anyone have examples on how to pull a treeview from a database, with the
database containing the parent and child node ID's?

Thanks
Greg

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Reply to this message...

Murad Kayani

Hi,

i did this for my recent project.

Table Structure

Folderid Projectid FolderName ParentID
0 1          Extranet     0
1 1          Personal     0
2 1          MyDocuments 1
3 1      Images         1
4 1      Files         0
5 1      MyFiles     4
6 1      MyFiles2     4
7 1      MyImages     3
8 1      MyImages2     3

//Creating DataSet for TreeView

string Qry = "Select * from folders ";
SqlDataAdapter myCommand = new SqlDataAdapter(Qry ,myConnection);
DataSet dsFolder = new DataSet();
myCommand.Fill(dsFolder,"Folders");

//Creating Type for Nodes
// add tree node "type" for folders and files

string imgurl = "Images/";
TreeNodeType type;
type = new TreeNodeType();
type.Type = "folder";
type.ImageUrl = imgurl + "folder.gif";
type.ExpandedImageUrl = imgurl + "folderopen.gif";
TreeView1.TreeNodeTypes.Add( type );

//RootNode is hardcoded for seting intial value to NodeData Peoperty of
treeNode.


Microsoft.Web.UI.WebControls.TreeNode RootNode;
RootNode = new Microsoft.Web.UI.WebControls.TreeNode();
RootNode.NodeData="0";
RootNode.Text= ["FolderName"].ToString();
RootNode.Type="folder";
RootNode.NavigateUrl="DocumentList.aspx?Fid="+ "0".ToString();
RootNode.Target="doc"; //If you are using Frame.
TreeView1.Nodes.Add(RootNode);
RootNode.Expanded = true;

//Using Recursive Function for looping throught Each node and find the value
of Node Data. If the Value of Node Data is equal //to Folders Parent id then
it will add new Node into that.

TreeNode newNode;

                foreach(DataRow Folder in
dsFolder.Tables["Folders"].Rows)
                {
                    newNode= new
Microsoft.Web.UI.WebControls.TreeNode();

                    newNode.NodeData=
Folder["Folderid"].ToString();


newNode.Text=Folder["FolderName"].ToString();

                    newNode.Type="folder";

                    newNode.NavigateUrl =
"DocumentList.aspx?Fid=" + Folder["Folderid"];

                    newNode.Target= "doc";


AttachByData(newNode,Folder["Parentid"].ToString());
                }


            }
        }
        private void AttachByData(TreeNode node,string NodeData)
        {


            foreach(TreeNode n in TreeView1.Nodes)
            {
                FindRecursive(node,n,NodeData);
            }

        }
        private void FindRecursive(TreeNode AttachNode,TreeNode
n,string Data)
        {
            if (n.NodeData == Data)
            {
                n.Nodes.Add(AttachNode);
            }
            else
            {


                foreach
(Microsoft.Web.UI.WebControls.TreeNode aNode in n.Nodes)
                {

FindRecursive(AttachNode,aNode,Data);
                }

            }

-----Original Message-----
From: Greg [mailto:Click here to reveal e-mail address]
Sent: Friday, June 28, 2002 9:19 AM
To: aspngwebcontrols
Subject: [aspngwebcontrols] Treeview from database

Anyone have examples on how to pull a treeview from a database, with the
database containing the parent and child node ID's?

Thanks
Greg

Reply to this message...

mic

Hi Murad Kayani,

I have tried to make a treeview with the code you post above.
I am working with visual studio .net 2003, but i have some build errors.
Did you visually create the sqlconnection and sqladapter?
Maybe you could upload the files somewhere so i can download it or maybe you can mail them?

--------------------------------
From: mic

Reply to this message...

	System.Data.CommandType
	System.Data.DataRow
	System.Data.DataSet
	System.Data.SqlClient.SqlCommand
	System.Data.SqlClient.SqlDataAdapter
	System.EventArgs
	System.Object
	System.Windows.Forms.TreeNode
	System.Windows.Forms.TreeView

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