This is a migrated thread and some comments may be shown as answers.

How to set RadComboBox SelectedValue with Treeview control

7 Answers 270 Views
ComboBox
This is a migrated thread and some comments may be shown as answers.
Jayant Paliwal
Top achievements
Rank 1
Jayant Paliwal asked on 14 Oct 2009, 04:59 PM
Hii,
I have a treeview control inside a combobox. The treeview is binding with datasource and I set its DataTextField,DataFieldParentID and DataValueField property. By this user can select any node of that treeview control and during insert query I get the value of the selected item by below code.

RadTreeView treeBusiness = (RadTreeView)this.RadComboBox1.Items[0].FindControl("RadTreeView1"); 
int id =Convert.ToInt32(treeBusiness.SelectedValue); 


Now my problem is in the edit mode of data, I need to set the combobox value that comes from query string. Like

RadComboBox1.SelectedValue = Request.QueryString["ID"]; 

RadComboBox1 is populating with blank rather then expected text.
This code only works if I dont use treeview inside a combobox. Please help me what I am missing here.
Thanks,
Jayant Paliwal

7 Answers, 1 is accepted

Sort by
0
Vesko
Top achievements
Rank 2
answered on 16 Oct 2009, 07:56 AM
You can try the following:

RadComboBox1.Items[0].Value = Request.QueryString["ID"];  
RadComboBox1.Items[0].Selected = true

0
Jayant Paliwal
Top achievements
Rank 1
answered on 16 Oct 2009, 05:15 PM
Hii Sean,
Thanks for you reply. I tried your sol. but it is not working for me.

0
Vesko
Top achievements
Rank 2
answered on 20 Oct 2009, 11:57 AM
What happens?
Maybe you need to set the Text of Items[0] as well.
0
Jayant Paliwal
Top achievements
Rank 1
answered on 23 Oct 2009, 09:14 PM
Hii Sean,
Yes, by setting Text property it is showing the value on combobox, but it is not solving my problem. I want to get the value of that combobox on button click.

// Calling this function on page load event (!IsPostBack) condition
 private void LoadItemGroups()
    {
        DataSet ds = dwdb.ExecuteDataSet("sp_getItemGroupsList");       
        //find the treeview
        RadTreeView tree = (RadTreeView)this.RadComboBox1.Items[0].FindControl("RadTreeView1");

        tree.DataSource = ds;
        tree.DataBind();
        
        RadComboBox1.Items[0].Value = "2";
        RadComboBox1.Items[0].Selected = true;
        RadComboBox1.Items[0].Text = "Customer1";
    }
// Now on button click I want to get the selected value of combo.
 protected void Button1_Click(object sender, EventArgs e)
    {
        RadTreeView tree = (RadTreeView)this.RadComboBox1.Items[0].FindControl("RadTreeView1");
        string strID = tree.SelectedValue;
        // In strID i am getting blank value instead of value 2.
     
        string  strID2 = RadComboBox1.SelectedValue;
// Here combo always giving value that was set by LoadItemGroups() and if I select another value from that tree control, and after clicking the button tree.SelectedValue; is giving the correct value but RadComboBox1.SelectedValue; always giving the old value (I.E. 2), also combo showing the first text "Customer1" that was set by LoadItemGroups() function, instead of showing the newly selected text.

    }

Thanks,
Jayant Paliwal



0
Vesko
Top achievements
Rank 2
answered on 28 Oct 2009, 10:24 AM
In OnClientNodeClicked event of the treeview you should set the text and the value of the combobox's item:

combo.trackChanges(); 
var item = combo.get_items().getItem(0); 
item.set_text(node.get_text()); 
item.set_value(node.get_value()); 
combo.commitChanges(); 

Note the usage of the trackChanges and commitChanges methods.



Hope this helps.
0
Jayant Paliwal
Top achievements
Rank 1
answered on 30 Oct 2009, 04:54 PM
Hii Sean,
I tried your new solution but still it is not satisfiying me completely. Still when I click on button to get newly selected value, it gives me the new value but combox again reset with old text. I am pasting the complete code what I am using.

 <form id="form1" runat="server"
    <div> 
    <asp:ScriptManager ID="ScriptManager1" runat="server"
    </asp:ScriptManager> 
     <telerik:RadComboBox ID="RadComboBox1" runat="server" Width="200px" Height="300px" OnClientDropDownOpened="OnClientDropDownOpenedHandler" > 
                            <ItemTemplate> 
                                <div onclick="StopPropagation(event)"
                                    <telerik:RadTreeView ID="RadTreeView1" runat="server" DataFieldID="ItemGroupID" DataFieldParentID="ParentItemGroupID" 
                                        DataTextField="ItemGroup" DataValueField="ItemGroupID"  OnClientNodeClicked="nodeClicking"
                                    </telerik:RadTreeView> 
                                </div> 
                            </ItemTemplate> 
                            <Items> 
                                <telerik:RadComboBoxItem /> 
                            </Items> 
                            </telerik:RadComboBox> 
                              
    </div> 
    <script type="text/javascript"
        function nodeClicking(sender, args) { 
            var comboBox = $find("<%= RadComboBox1.ClientID %>"); 
 
            var node = args.get_node();            
 
            comboBox.trackChanges(); 
            comboBox.set_text(node.get_text()); 
           
            comboBox.get_items().getItem(0).set_value(node.get_value()); 
            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("RadTreeView1"); 
            var selectedNode = tree.get_selectedNode(); 
            if (selectedNode) { 
                selectedNode.scrollIntoView(); 
            } 
        } 
        </script> 
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" /> 
      
    </form> 
I checked it with OnClientNodeClicking event too, but not working.
Here is the C# code
 protected void Page_Load(object sender, EventArgs e) 
    { 
        if (!IsPostBack) 
        {             
            LoadItemGroups();                   
        } 
    } 
   
    private void LoadItemGroups() 
    { 
        DataSet ds = dwdb.ExecuteDataSet("sp_getItemGroupsList"); 
 
        ItemGroups iG = new ItemGroups();         
        //find the treeview 
        RadTreeView tree = (RadTreeView)this.RadComboBox1.Items[0].FindControl("RadTreeView1"); 
        
        tree.DataSource = ds; 
        tree.DataBind(); 
 
        RadComboBox1.Items[0].Value = "25"
        RadComboBox1.Items[0].Selected = true
        RadComboBox1.Items[0].Text = "CV/Met"
    } 
     
 
    protected void Button1_Click(object sender, EventArgs e) 
    { 
        RadTreeView tree = (RadTreeView)this.RadComboBox1.Items[0].FindControl("RadTreeView1"); 
         
        string strTreeID = tree.SelectedValue; 
 
        string strComboID = RadComboBox1.SelectedValue; 
    }    

Can you please check this code and let me know what I am missing ?

Thanks,
Jayant Paliwal
0
Basel Nimer
Top achievements
Rank 2
answered on 20 May 2010, 03:14 AM
even late, but this might benefit someone else.

see the end of this post

http://www.telerik.com/community/forums/aspnet-ajax/combobox/set-the-value-of-combo-box.aspx#1205727


Tags
ComboBox
Asked by
Jayant Paliwal
Top achievements
Rank 1
Answers by
Vesko
Top achievements
Rank 2
Jayant Paliwal
Top achievements
Rank 1
Basel Nimer
Top achievements
Rank 2
Share this question
or