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Creating ComboBox Programmatically

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ComboBox

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

14 Answers, 1 is accepted

Accepted

answered on 20 Jul 2009, 08:55 PM

Hi,

good question - "Can you help me figure out what I am missing or what I am doing wrong?"
Since I don't know what you exactly do I can't tell you what you do wrong :)

Anyhow - I can provide you with a working sample:

    
            protected void Page_Load(object sender, EventArgs e) {  
        
                RadComboBox rcB = new RadComboBox();  
        
                rcB.ID = "MyCombo";  
        
                rcB.Items.Add(new RadComboBoxItem("Text1","val1"));  
        
                rcB.Items.Add(new RadComboBoxItem("Text2","val2"));  
        
                rcB.Items.Add(new RadComboBoxItem("Text3","val3"));  
        
                rcB.Items.Add(new RadComboBoxItem("Text4","val4"));  
        
                divPlaceHolder.Controls.Add(rcB);  
        
            }

And the markup looks something like this:

    
            <telerik:RadScriptManager ID="rsmMain" runat="server" ...  
        
            </telerik:RadScriptManager> 
        
            <telerik:RadAjaxManager ID="ramManager" runat="server" ...  
        
            </telerik:RadAjaxManager> 
        
            <div> 
        
              <div id="divPlaceHolder" runat="server"></div> 
        
              ...  
        
            </div>

The inner div is used to have a good place where to insert the control.
RadScriptManager and RadAjaxManager could be on a masterpage - if you have one.

Do YOU know now what you were missing? :)

Regards

Manfred
PS: if the answer solved your problem - please "Mark as answer"

answered on 21 Jul 2009, 01:26 PM

Hi,

no - no idea. For me it works.

I created a page on my test site
http://www.pp-p.net/TDynCombo.aspx
The page markup:

    
            <head runat="server">  
        
                <title></title>  
        
            </head> 
        
            <body> 
        
                <form id="form1" runat="server">  
        
                <telerik:RadScriptManager runat="server">  
        
                </telerik:RadScriptManager> 
        
                <div> 
        
                <div runat="server" id="divPlaceHolder"></div> 
        
                <p> 
        
                    <a href="TDynCombo.aspx">Refresh</a></p>  
        
                <p> 
        
                    <a href="Default.aspx">Home</a></p>  
        
                </div> 
        
                </form> 
        
            </body> 
        
            </html>

And the code (no changes to the previous sample):

    
            public partial class TDynCombo : System.Web.UI.Page {  
        
                protected void Page_Load(object sender, EventArgs e) {  
        
                    RadComboBox rcB = new RadComboBox();  
        
                    rcB.ID = "MyCombo";  
        
                    rcB.Items.Add(new RadComboBoxItem("Text1", "val1"));  
        
                    rcB.Items.Add(new RadComboBoxItem("Text2", "val2"));  
        
                    rcB.Items.Add(new RadComboBoxItem("Text3", "val3"));  
        
                    rcB.Items.Add(new RadComboBoxItem("Text4", "val4"));  
        
                    divPlaceHolder.Controls.Add(rcB);  
        
                }  
        
            }

Does this combo work for you?
Could you (just to check it out) create an empty page in your solution and add this combo and code to it?

And by the way - which version of the controls do you use?
I use 2009.2.701.35

Regards

Manfred

answered on 21 Jul 2009, 02:50 PM

Hi,

what you say tells me two things:
a.) You have autopostback on at the combo (so finishing a selection "postbacks")
b.) ASP.NET works as expected :))

The thing is "comlicated" - a bit.
Not basically - but it depends a lot on what you do.
I guess (not sure) you set the "SelectedIndex" or something on your code behind.

If you need this initially - make a condition around it
if(!IsPostBack) {
SetSelectedIndexSomeHow();
}

I just added one button to the testpage (no code behind) - and you can see the combo keeps its selection.

    
                <asp:Button runat="server" Text="PostBack" />

You can see it at http://www.pp-p.net

Regards

Manfred

answered on 21 Jul 2009, 02:58 PM

OK, Here is what i have going on. When I am creating my combo box.

RadComboBox RadComboBox1 = new RadComboBox();
RadComboBox1.ID = "RadComboBox1";
Page.Master.FindControl("DropDown").Controls.Add(RadComboBox1);
RadComboBox1.EnableTextSelection = true;
RadComboBox1.AutoPostBack = false;
RadComboBox1.DataTextField = "TABLE_NAME";
RadComboBox1.DataValueField = "TABLE_SCHEMA";
RadComboBox1.DataSource = PopulateDDL("Some Query");
RadComboBox1.DataBind();

As you can see I do not have autopostback set to true. That is what is puzzling to me. I am not even trying to get the data out of my drop down yet. I am confused why when I select the data and just click a random spot on the screen the drop down refreshes and resets my selection back to the first item of the list.

Kyle

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Creating ComboBox Programmatically

14 Answers, 1 is accepted