treeview menu

Question

Hi there, I need to create a tree view menu that will be populated via a db as well as to be able to add as many childs as we want. Any Ideas on how to approch this? many thanks

Mahesh Chand · Answer

Also look at this for ASP.NET Menu. http://obout.com/em/em_whatis.aspx To determine what is parent, what is a child, your database has to support that. It has to store level of a Tree node. For example, level 0 will be the root level nodes, with an ID. First level of nodes will have level = 1 and a parent. So database table should have these columns in addition to what you already have. ID Parent ID Level Description 1 0 0 Root Node 2 1 1 First Child 3 1 1 Second Child 4 2 2 First Grand Child When you build your tree, first you will get all the nodes with Level 0 and create them as root level of children. Then you will build a recursive loop and find the first root level node, find all children with parent 0 and add them to that root node and so on.

Ifour Hiren · Answer

mkariti mkariti · Answer

Finally.......! protected void Page_Load(object sender, EventArgs e) { DropDownList1.DataSource = mydb.Recursives; DropDownList1.DataTextField = "Title"; DropDownList1.DataValueField = "id"; DropDownList1.DataBind(); if (!IsPostBack) { var parentlist = mydb.Recursives.Where(p => p.ParentID == null).First(); int? parId = 0; TreeNode firstParent = getTreeNode(parentlist, ref parId); TreeView1.Nodes.Add(firstParent); addnew(firstParent, parId); } } private void addnew(TreeNode firstParent, int? parId) { var childlist = mydb.Recursives.Where(p => p.ParentID == parId); foreach (Recursive item in childlist) { int? pId = 0; TreeNode tmp = getTreeNode(item, ref pId); firstParent.ChildNodes.Add(tmp); addnew(tmp , pId); } } private static TreeNode getTreeNode(Recursive parentlist, ref int? parid) { TreeNode firstParent = new TreeNode(); firstParent.Text = parentlist.Title; firstParent.Value = "" + parentlist.id; parid = parentlist.id; return firstParent; }

mkariti mkariti · Answer

Normal 0 false false false EN-US X-NONE HE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable{mso-style-name:"Table Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-qformat:yes;mso-style-parent:"";mso-padding-alt:0cm 5.4pt 0cm 5.4pt;mso-para-margin-top:0cm;mso-para-margin-right:0cm;mso-para-margin-bottom:10.0pt;mso-para-margin-left:0cm;line-height:115%;mso-pagination:widow-orphan;font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:"Times New Roman";mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Arial;mso-bidi-theme-font:minor-bidi;} Many thanks Mahesh Chand , But I've already looked at these post and unfortunately wasn't that helpful. I need to populate the tree view from the database using entity and I cant seems to get it right. How do you determine which will be the child and which will be the parent? The old post (i.e .net 2 ) speeks about node.ID which I cant seems to find. Cheers mk

Mahesh Chand · Answer

Here are two more articles on ASP.NET TreeView. TreeView control in asp.net 3.5 Display Directory Structure Using TreeView Control in ASP.NET

Mahesh Chand · Answer

Here is a good link on ASP.NET TreeView. ASP.NET TreeView

mkariti mkariti · Answer

ASP.NET Many thanks

Mahesh Chand · Answer

ASP.NET or Windows Forms or WPF?

treeview menu

Answers (8)