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Value is not displaying in text box

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Manoj
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Manoj asked on 18 Dec 2008, 03:11 PM
Hi,
    I am using a tree view control . Based upon the node selection I want to display some text into the text boxes . I have pasted part of my code below.
But I am not getting any value to the text boxes .

 

 



 

 

protected void rtvDetailData_NodeExpand(object sender, RadTreeNodeEventArgs e)
    {
        SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["codingspecialsConnectionString"].ConnectionString);

        SqlCommand selectCommand = new SqlCommand(@"select Heirarchy.childid AS NodeId , Heirarchy.childdescription AS NodeText , Heirarchy.Name, Heirarchy.UPCCode , Heirarchy.CNAN , COUNT(Children.childid) AS ChildCount from Heirarchy LEFT JOIN Heirarchy As Children ON Heirarchy.childid = Children.childid WHERE Heirarchy.ParentID = @parentId GROUP BY Heirarchy.childid , Heirarchy.childdescription , Heirarchy.Name, Heirarchy.UPCCode , Heirarchy.CNAN ", connection);
       

        selectCommand.Parameters.AddWithValue("parentId", e.Node.Value);
        SqlDataAdapter adapter = new SqlDataAdapter(selectCommand);
        DataTable data = new DataTable();
        adapter.Fill(data);
       
        foreach (DataRow row in data.Rows)
        {
            RadTreeNode node = new RadTreeNode();
            node.Text = row["NodeText"].ToString();
            node.Value = row["NodeId"].ToString();

            txtName.Text = row["NodeText"].ToString();
            txtUPCCode.Text = row["UPCCode"].ToString();
            txtCNANNum.Text = row["CNAN"].ToString();
           
            if (Convert.ToInt32(row["ChildCount"]) > 0)
            {
                node.ExpandMode = TreeNodeExpandMode.ServerSideCallBack;
            }
            e.Node.Nodes.Add(node);
        }
        e.Node.Expanded = true;       
    }

Can you tell me where I am doing the mistake .

With Thanks & Regards
Manoj

 

 

 

 

 

 

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Manoj
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answered on 19 Dec 2008, 10:55 AM
Hi,
    Anybody can help me out ?

With Thanks & Regards
Manoj
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Veselin Vasilev
Telerik team
answered on 20 Dec 2008, 09:48 AM
Hello Manoj,

In NodeExpand event you cannot update any other control but the TreeView. You can only add nodes to the expanded node.

You can use the client-side event like OnClientNodePopulated to update any control on the page which fires after the nodes has been added to the expanded node.

Kind regards,
Veselin Vasilev
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Iggy
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answered on 06 Jan 2009, 04:29 PM
Is there a way to send back data from the server that could then be checked in the OnClientNodePopulated function on the client?  For instance, if I wanted to send back a custom message to be displayed in an alert on the client how could that be accomplished? 
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Atanas Korchev
Telerik team
answered on 06 Jan 2009, 05:05 PM
Hi Iggy,

Only the nodes created during the NodeExpand handler are transmitted back to the client. The only possible way is to use a dummy node to transport the data and then remove it.

Regards,
Albert
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Iggy
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answered on 07 Jan 2009, 07:23 PM
Thanks, it works great. 

Here's how I'm handling it:
In the code-behind I'm creating a dummy node and adding a custom attribute to it.  The original node (e.node) will then only have one child node.
RadTreeNode node = new RadTreeNode();  
node.Attributes["LoginExpired"] = "true";  
e.Node.Nodes.Add(node);  
 

Then in the client code, if there is only one node I check if that node has the custom attribute that I added and then am removing the node and doing any other required code:
function rtvOU_NodePopulated(sender, args) {  
  var childNodes = args.get_node().get_nodes();  
  if (childNodes.get_count() == 1) {  
     //If the user's login expired then we add a dummy node to the tree, here we check for it  
     if (childNodes.getNode(0).get_attributes().getAttribute("LoginExpired")) {  
       //The custom attribute exists so remove the dummy child node  
       childNodes.remove(childNodes.getNode(0));  
 
       //Do any other processing needed  
       alert("Your session has expired.  Please login again to continue.");  
    }  
  }  
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Manoj
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Veselin Vasilev
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Iggy
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Atanas Korchev
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