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Item Type: NewsGroup Date Entered: 11/30/2005 3:14:21 AM Date Modified: Subscribers: 0 Subscribe Alert
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IthraelArlet
Asp.Net User
HOW TO: Expand Tree to SelectedNode11/30/2005 3:14:21 AM

0

I've seen this asked a couple times in various threads, so am posting a quick follow-up.  The following code allows you to automatically open a TreeView control that is being used for navigation to the current page, while closing all other nodes, similar to MSDN's behavior.  The benefits of this includes: a) For large sitemaps, keeps default navigation state small, and b) Provides users with immediate feedback as to where they are at within the site hierarchy (especially helpful for users being linked to a page remotely). 

The core function:

  void RevealDescendents(TreeNode treeNode) {
    if (treeNode == null) return;
    treeNode.Expanded = true;
    if (treeNode.Parent == null) return;
    RevealDescendents(treeNode.Parent);
    }

Then call:

  RevealDescendents(objTreeView.SelectedNode);

Important: If you are using declaritive syntax for adding nodes, you can do it in the standard Page_Load event; however, if you are using databinding then this must be done in PreRenderComplete (reference, thanks to jdixon for this tip).  If your TreeView is in a master template or user control you may need to wireup the Page.PreRenderComplete() event as follows:

  Page.PreRenderComplete += new EventHandler(Page_PreRenderComplete);

I do this in my Page_Load event.  You can then add an event handler called Page_PreRenderComplete to the master template.  Again, this is only necessary if you are using databinding (e.g., binding to the web.sitemap file or any custom sitemap provider class).

Jeremy
Lee Dumond
Asp.Net User
Re: HOW TO: Expand Tree to SelectedNode12/6/2005 8:13:31 AM

0

I need to figure out a way to do this, but I don't know C#, only VB.

Essentially, I need to be able to reveal all the "ancestors" of the selected node back to the beginning, plus expand the selected node by one level, such that all the children (but not grandchildren, etc.) of that node are also revealed.

In other words, as I drill down into the tree, it will provide feedback back to the top of the tree on that branch only, plus reveal what's underneath the currently selected node.

I am desperate to get this done at this point. Again, I do need the solution in VB.

Thanks very much,

~ Lee

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IthraelArlet
Asp.Net User
Re: HOW TO: Expand Tree to SelectedNode12/6/2005 10:34:50 PM

0

I don't know Visual Basic, but I think the code would look something like this:

  Sub RevealDescendents (treeNode As TreeNode) 
    if (treeNode Is Null) Return
    treeNode.Expanded = true
    if (treeNode.Parent Is Null) Return
    RevealDescendents(treeNode.Parent)
  End Sub

I'm not sure what the exact event wireup syntax is in VB to get around the Page_PreRenderComplete() issue, but once you wire that up this function should do the trick for you. 

Lee Dumond
Asp.Net User
Re: HOW TO: Expand Tree to SelectedNode12/11/2005 7:49:29 PM

0

Thanks for a brilliant piece of work here. That thing about the PreRenderComplete would have had me stumped for days.

This trick is very, very slick, and works perfectly. In case anyone is interested in doing it with VB:

The core function:

Protected Sub RevealDescendents(ByVal treeNode As TreeNode)
   If treeNode IsNot Nothing Then
      treeNode.Expand()
   Else
      Return
   End If
   If treeNode.Parent IsNot Nothing Then
      RevealDescendents(treeNode.Parent)
   Else
      Return
   End If
End Sub

Then, call the function as follows:

Public Sub Page_PreRenderComplete(ByVal sender As Object, ByVal e As System.EventArgs)
   RevealDescendents(TreeViewMaster1.SelectedNode)
End Sub

Like the man said, if you want to do this with databinding, you need to handle it in PreRenderComplete. If you're using the tree on a Master page, you have to reference it from the content page by exposing the PreRenderComplete event like this:

Public Event PreRenderComplete As EventHandler

and wiring it up from Page_Load in the content page, as follows:

AddHandler PreRenderComplete, AddressOf Master.Page_PreRenderComplete

and that's it, VB style. Again, thanks for the solution, IthraelArlet!

==================================================
Don't forget to click "Mark as Answer" on the post that helped you.
This credits that member, earns you a point and marks your thread as Resolved so we all know you have been helped.
4 Items, 1 Pages 1 |< << Go >> >|


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Web:
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