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TreeView in ComboBox bind with XML

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TreeView
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bo
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bo asked on 29 Sep 2008, 03:38 AM
I have a problem when i following sample TreeView in ComboBox, I do a bit modify. I load node from XML file(same thing happen binf with datatable).

when select a node from treeview, the combobox item showing all Text values in the treeview at first time.  But it's fine if i select again.

For example:
Page init: blank
select node "Books": shows "booksArtsBiographies..." (suppose showing "Books")
select node "Music":  shows "Music"



please try following sample:
Aspx page:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default9.aspx.cs" Inherits="Default9" %> 
 
<%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %> 
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
 
<html xmlns="http://www.w3.org/1999/xhtml">  
<head runat="server">  
    <title></title>  
</head> 
<body> 
    <form id="form1" runat="server">  
    <script type="text/javascript">          
        function nodeClicking(sender, args)  
        {  
            var comboBox = $find("<%=RadComboBox1.ClientID%>");  
            var node = args.get_node()  
 
            comboBox.set_text(node.get_text());  
            comboBox.set_value(node.get_value());  
              
            comboBox.hideDropDown();  
        }          
</script> 
    <div> 
      
        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">  
        </telerik:RadAjaxManager> 
      
        <telerik:RadScriptManager ID="RadScriptManager1" Runat="server">  
        </telerik:RadScriptManager> 
      
        <telerik:RadComboBox ID="RadComboBox1" ShowToggleImage="True" OnItemsRequested="ItemsRequested" Runat="server">  
<CollapseAnimation Type="OutQuint" Duration="200"></CollapseAnimation> 
            <ItemTemplate> 
                <telerik:RadTreeView ID="RadTreeView1"   
                                OnClientNodeClicking="nodeClicking" Runat="server">  
                </telerik:RadTreeView> 
            </ItemTemplate> 
            <Items> 
                <telerik:RadComboBoxItem Selected="True"></telerik:RadComboBoxItem> 
            </Items> 
        </telerik:RadComboBox> 
      
    </div> 
    </form> 
</body> 
</html> 
 

Code:
using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Web;  
using System.Web.UI;  
using System.Web.UI.WebControls;  
using Telerik.Web.UI;  
using System.Xml.Linq;  
 
public partial class Default9 : System.Web.UI.Page  
{  
    protected void Page_Load(object sender, EventArgs e)  
    {  
        if (!IsPostBack && !RadAjaxManager1.IsAjaxRequest)  
        {  
            Populate();  
        }  
    }  
 
    private void Populate()  
    {  
        if (RadComboBox1.Items.Count == 0)  
        {  
            RadComboBox1.Items.Add(new RadComboBoxItem());  
        }  
 
        RadTreeView ParenTreeView = (RadTreeView)RadComboBox1.Items[0].FindControl("RadTreeView1");  
 
        ParenTreeView.LoadContentFile("TreeView.xml");  
    }  
 
 
 
    protected void ItemsRequested(object o, RadComboBoxItemsRequestedEventArgs e)  
    {  
        Populate();  
    }  
}  
 

XML:
<?xml version="1.0" encoding="utf-8" ?> 
<Tree> 
  <Node Text="Books" Expanded="True">  
    <Node Text="Arts" /> 
    <Node Text="Biographies" /> 
    <Node Text="Children's Books" /> 
    <Node Text="Computers &amp;amp; Internet" /> 
    <Node Text="Cooking" /> 
    <Node Text="History" /> 
    <Node Text="Fiction" /> 
    <Node Text="Mystery" /> 
    <Node Text="Nonfiction" /> 
    <Node Text="Romance" /> 
    <Node Text="Science Fiction " /> 
    <Node Text="Travel" /> 
  </Node> 
  <Node Text="Music">  
    <Node Text="Alternative" /> 
    <Node Text="Blues" /> 
    <Node Text="Children's Music" /> 
    <Node Text="Classical" /> 
    <Node Text="Country" /> 
    <Node Text="Dance" /> 
    <Node Text="Folk " /> 
    <Node Text="Hard Rock" /> 
    <Node Text="Jazz" /> 
    <Node Text="R&amp;amp;B" /> 
    <Node Text="Soundtracks" /> 
  </Node> 
  <Node Text="Movies">  
    <Node Text="Action" /> 
    <Node Text="Animation" /> 
    <Node Text="Classics" /> 
    <Node Text="Comedy" /> 
    <Node Text="Documentary" /> 
    <Node Text="Drama" /> 
    <Node Text="Horror" /> 
    <Node Text="Musicals" /> 
    <Node Text="Mystery" /> 
    <Node Text="Westerns" /> 
  </Node> 
  <Node Text="Software">  
    <Node Text="Business &amp;amp; Office" /> 
    <Node Text="Database" /> 
    <Node Text="Networking" /> 
    <Node Text="Presentation" /> 
    <Node Text="Project Management" /> 
    <Node Text="Reports" /> 
    <Node Text="Spreadsheet" /> 
    <Node Text="Word Processing" /> 
  </Node> 
</Tree> 

3 Answers, 1 is accepted

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Rosi
Telerik team
answered on 29 Sep 2008, 12:58 PM
Hello bo,

I suggest you wrap the treeview with a div and execute the following javascript when the div is clicked.

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

You can see our online example for more details

Regards,
Rosi
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.
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bo
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answered on 29 Sep 2008, 10:03 PM
Dear Rosi :

Thanks for you quick response. YOu suggestion is works.
But i have another problem.
I need retrive text field and value field form treeview control.

at moment, only comboBox.set_text works. i can get from code behind using comboBox.Text.

If i want to save value as well, how can i get the value from code behind? like comboBox.set_value
0
Rosi
Telerik team
answered on 30 Sep 2008, 03:19 PM
Hi Bo,

To set the value client side I suggest you use the following javascript code:

comboBox.findItemByText("sometext").select();


Then you can get the SelectedValue of RadComboBox at code-behind like this:
 
RadComboBox1.SelectedValue;

Kind regards,
Rosi
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.
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