RADTREEVIEW IN RADCOMBOBOX

[Sanjay]

Hello,

I am having hard time to code for RadTreeView in a RadComboBox. I am using VB.NET. I cannot see the RadTreeView instance at all
from the code behind. Even if I try the FindControl method! I have to dynamically populate the treenodes with data from SQL Server

ASPX code:
<span><telerik:RadComboBox ID="ddDocType" runat="server" Width="200px" ShowToggleImage="True" Style="vertical-align: middle;" >
    <ItemTemplate>
        <div id="div1">
    <telerik:RadTreeView ID="rtvDocType" runat="server" Width="300px" Height="250px">
        <DataBindings>
            <telerik:RadTreeNodeBinding Expanded="True" />
        </DataBindings>
    </telerik:RadTreeView>
        </div>
    </ItemTemplate>
</telerik:RadComboBox></span>

VB.NET code:

 

 

Dim tvDoc As RadTreeView = New RadTreeView()

 

tvDoc =

CType(FindControl("rtvDocType"), RadTreeView)

 

tvDoc.Nodes.Clear()

 

 

Here tvDoc gives a ERROR 'NullReferenceException'

How can I make it work. Is there any working example where the Nodes are dinamically added from code behind for the RadTreeView
in a RadComboBox?

Thanks,
Sanjay

 

[Denis]

Hello Sanjay
Try to use

Dim tvDoc As RadTreeView = New RadTreeView()

 

tvDoc = CType(FindControl("rtvDocType"), ddDocType.Items(0))

 

Denis

[Sanjay]

Hi Denis,

I tried: tvDoc = CType(FindControl("rtvDocType"), ddDocType.Items(0))
but gives error: 
Error 22 Type 'ddDocType.Items' is not defined.
For the 0 in argument it says:
Error 23 Array bounds cannot appear in type specifiers.

Since I have ItemTemplate in aspx code, I also tried CType(FindControl("rtvDocType"), ddDocType.ItemTemplate(0))
But same errors

Please help. Maybe an example in your library with vb.net code will be helpful!

Thanks,
Sanjay

[Denis]

Yes it's normal. I've forget to mention that you have to add the following section after the itemtemplate of your RadCombo :

<Items>  
<telerik:RadComboBoxItem Text="" />  
</Items>

Denis

[Sanjay]

Hi Denis,

Sorry after adding the block:
<Items>  
<telerik:RadComboBoxItem Text="" />  
</Items> 

I get the same error!

My new block below:

 

<telerik:RadComboBox ID="ddDocType" runat="server" Width="200px" ShowToggleImage="True" Style="vertical-align: middle;" >

 

 

<ItemTemplate>

 

 

<telerik:RadTreeView ID="rtvDocType" runat="server" Width="300px" Height="250px">

 

 

<DataBindings>

 

 

<telerik:RadTreeNodeBinding Expanded="True" />

 

 

</DataBindings>

 

 

</telerik:RadTreeView>

 

 

</ItemTemplate>

 

 

<Items>

 

 

<telerik:RadComboBoxItem Text="" />

 

 

</Items>

 

 

</telerik:RadComboBox>

Please help...

Thanks,
Sanjay

Sanjay

 

[Denis]

Hello Sanjay,

I'm a beginner in telerik and use to program in c#. Here is a working sample :

aspx source :
<script type="text/javascript">
        function ApplicationNodeClicking(sender, args)
        {
            var comboBox = $find("<%= RadComboBoxApplications.ClientID %>");
            var node = args.get_node()
            comboBox.set_text(node.get_text());
            comboBox.trackChanges();
            comboBox.get_items().getItem(0).set_value(node.get_text());
            comboBox.commitChanges();
            comboBox.hideDropDown();
        }

        function StopPropagation(e)
        {
            if (!e)
            {
                e = window.event;
            }
            e.cancelBubble = true;
        }

        function OnClientDropDownOpenedHandler(sender, eventArgs)
        {
//            var tree = sender.get_items().getItem(0).findControl("RadTreeViewApplications");
//            var selectedNode = tree.get_selectedNode();
//            if (selectedNode)
//            {
//                selectedNode.scrollIntoView();
//            }
        }
    </script>
<div>
        <telerik:RadComboBox ID="RadComboBoxApplications" runat="server" ShowToggleImage="True" Style="vertical-align: middle;" OnClientDropDownOpened="OnClientDropDownOpenedHandler" EmptyMessage="Choose an application" oninit="RadComboBoxApplications_OnInit">
        <ItemTemplate>            
            <div id="div1">
            <telerik:RadTreeView  ID="RadTreeViewApplications" ShowLineImages="false"  runat="server" CheckBoxes="true"  OnClientNodeClicking="ApplicationNodeClicking"  >        
            </telerik:RadTreeView>        
            </div>
        </ItemTemplate>
        <Items>  
            <telerik:RadComboBoxItem Text="" />  
        </Items>         
        </telerik:RadComboBox>        
    </div>

<script type="text/javascript">
        var divitem = document.getElementById("div1");
        if(null!=divitem)
            divitem.onclick = StopPropagation;
    </script>

.cs source:

  private void bindApplicationsTree(ref RadTreeView objtree)
        {
            SqlConnection sqlConnection =new SqlConnection("a connection string");
            SqlCommand sqlCommand = new SqlCommand("select applicationid,applicationname from TApplications",sqlConnection);
            SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(sqlCommand);
            sqlConnection.Open();
            DataSet dsApplications = new DataSet();
            sqlDataAdapter.Fill(dsApplications);
            sqlConnection.Close();
            sqlDataAdapter.Dispose();
            objtree.DataValueField = "ApplicationID";
            objtree.DataTextField = "ApplicationName";
            objtree.DataSource = dsApplications;
            objtree.DataBind();

        }

       

        protected void RadComboBoxApplications_OnInit(object sender, EventArgs e)
        {
            Response.Write("<p>combo init fired</p>");
            RadComboBox objCombo = ((RadComboBox) sender);
            RadTreeView objTree = (RadTreeView)objCombo.Items[0].FindControl("RadTreeViewApplications");
            if(null!=objTree)
                bindApplicationsTree(ref objTree);
            else
            {
                Response.Write("<p>Warning: Unable to find the tree</p>");
            }
        }

I hope this help.


Denis

[Denis]

Hello Sanjay,

Any news about your problem ? I would appreciate some feedback.

Denis

[Sanjay]

Hi Denis,

I first got converted into VB.NET. That went fine.
FOR SOME REASON  oninit="RadComboBoxApplications_OnInit"
will do a postback and the selected treenode (radcombobox text) will be left blank.
Then I removed it and let the javascript in the client side populate the value.

Your last reply helped me more than the first two replies.

Thanks,
Sanjay

[Ednilson Martins]

This code works fine. It help me a lot. Thank's

[Atul]

It shows only Child Node I want All the hierarchy