RadTreeNode Custom Attributes in UI for ASP.NET AJAX TreeView

Vme

18 posts

Member since:
Mar 2008

Posted 24 Jul 2009 Link to this post

Hello,

I'm trying to create custom attributes on a Radtreenode that is being build with the property ServerSideCallback. For some reason, when I create this node with node.Attributes.Add("key", "Value"), it keeps the attribute at first. But once it posts back and I access the node via the RadTreeNodeEventArgs e.Node. My attributes Count=0 and I have no keys available to access the value. If I change the node to ServerSide, everything works fine, however, this isn't what I want.

Any suggestions or thoughts would be great.

--This is where i create the node.

<code>

foreach (var zone in x)

{

RadTreeNode zoneNode = new RadTreeNode();

zoneNode.Text = String.Format("Zone {0}", zone.ZoneName);

zoneNode.Value = zone.NSD_ZoneID.ToString();

zoneNode.Expanded = false;

zoneNode.ExpandMode = TreeNodeExpandMode.ServerSide;

zoneNode.Attributes.Add("type", "OnDemand");

zoneNode.PostBack = true;

zoneNode.Checkable = false;

node.Nodes.Add(zoneNode);

}

</code>

<code>

//This is where the e.Node.Attributes.Count = 0;

protected void DPTTreeView_NodeClick(object sender, Telerik.Web.UI.RadTreeNodeEventArgs e)

{

switch (e.Node.Attributes["type"])

{

...snip....

}

</code>

Yana

Admin

5043 posts

Posted 27 Jul 2009 Link to this post

Hi Kyle,

I suggest you use ExpandMode="ServerSide" and put RadTreeView inside RadAjaxPanel in order to ajaxify it.

Best wishes,
Yana
the Telerik team

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Vme

18 posts

Member since:
Mar 2008

Posted 27 Jul 2009 Link to this post

I know that will work, I mentioned it in my post. However, that isn't what I want to do. Why do custom attributes NOT WORK with ServerSideCallback? Is this a bug? Is this an intentional design? Should I upgrade/downgrade to get this to work correctly?

If it is a bug I would hope to see some official documentation so I can confirm.

Thank you!

Yana

Admin

5043 posts

Posted 29 Jul 2009 Link to this post

Hello Vme,

Actually this is expected behavior, because when you add nodes with ServerSideCallBack ExpandMode you can only set their Text and Value properties (as the new nodes are added through asynchronous callback, they're not serialized ). I've attached a simple page to show you a possible work-around, please download it and give it a try.

Kind regards,
Yana
the Telerik team

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treeviewloadondemand.zip

luc bonenfant

53 posts

Member since:
Sep 2007

Posted 01 Oct 2009 Link to this post

Hello,

I'm using custom attributes too for node expand and I tested your zip file ; it's working great.
But I tried to adapt the code for my specification and it doesn't work :
VB:

    
                    Public Sub RadTreeView1_NodeExpand(ByVal sender As Object, ByVal e As RadTreeNodeEventArgs)  
        
                        e.Node.Attributes.Add("type", "OnDemand")  
        
                    End Sub

Javascript:

    
                    function nodePopulated(sender, args) {  
        
                        sender.trackChanges();  
        
                        var node = args.get_node();  
        
                        node.get_attributes().setAttribute("type", node.get_textElement().attributes["type"].value);  
        
                        sender.commitChanges();  
        
                    }

Perhaps, the current node is not recalculate during ajax, because it already exists on the page...

It's very important that I retrieve the node attributes when I expand it, have you got a solution please ?
PS1 : I can't load the attributes for each subnode (your solution) because it's not efficient in my case ; it's better for me to get node attributes directly when node is expanded
PS2 : ExpandMode = ServerSide is not a good solution because my ajax render is big for each expand depth.

Thank you for help.

luc bonenfant

53 posts

Member since:
Sep 2007

Posted 02 Oct 2009 Link to this post

Finally, i'm using your code to arrive at my aim like this : (not great but functional...)
VB :

    
                    Public Sub RadTreeView1_NodeClick(ByVal sender As Object, ByVal e As RadTreeNodeEventArgs)  
        
                        Dim attr As String = e.Node.Attributes("type")  
        
                    End Sub 
        
                    Public Sub RadTreeView1_NodeExpand(ByVal sender As Object, ByVal e As RadTreeNodeEventArgs)  
        
                        Dim zoneNode As New RadTreeNode()  
        
                        zoneNode.Text = "Tmp" 
        
                        zoneNode.Attributes.Add("type", "OnDemand")  
        
                        e.Node.Nodes.Insert(0, zoneNode)  
        
                    End Sub

Javascript :

    
                    function nodePopulated(sender, args) {  
        
                        var parentNode = args.get_node();  
        
                        var childNode = args.get_node().get_nodes().getNode(0);  
        
                        sender.trackChanges();  
        
                        if (childNode.get_textElement().attributes["type"])  
        
                            parentNode.get_attributes().setAttribute("type", childNode.get_textElement().attributes["type"].value);  
        
                        parentNode.get_nodes().remove(childNode);  
        
                        sender.commitChanges();  
        
                    }

Yana

Admin

5043 posts

Posted 05 Oct 2009 Link to this post

Hello Luc,

I'm glad you could find a solution.

Best wishes,
Yana
the Telerik team

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