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ComboBox SelectedValue Not Working

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ComboBox

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

23 Answers, 1 is accepted

answered on 23 Sep 2009, 10:31 AM

selectedvalueusercontrol.zip

Hi,

What is the exact RadComboBox setup you are using?
We tested the behavior locally, but couldn't reproduce the issue. Please find attached our test files.
Could you modify them so we can see the problem you experience?

Kind regards,
Helen
the Telerik team

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answered on 22 Oct 2009, 04:14 AM

I am getting a similar issue. In my case the RadComboBox is loaded from a user control and the very first time it is loaded into the page, it works correctly (Sets the selected value). However, on subsequent postbacks, the combo box loads with the value that it initially loaded with, even though the a new value has been selected. (I have tested this in the debugger).

The code that I am using in the usercontrol looks something like this (you can see I have tried multiple ways to set this value correctly):

    
                    Label1.Text = _PD.DisplayName 
        
                    Dim tText As New RadComboBox() 
        
                    tText.ID = _PD.Name 
        
                    tText.Width = New Unit("200px") 
        
                    tText.LoadContentFile(_ConfigFile) 
        
                    tText.EnableViewState = False 
        
                    ''tText.SelectedIndex = tText.Items.FindItemIndexByValue(_PD.GetValue(_Node)) 
        
                    tText.SelectedValue = _PD.GetValue(_Node) 
        
                    ''tText.Items.FindItemByValue(_PD.GetValue(_Node)).Selected = True 
        
                    PlaceHolder1.Controls.Add(tText)

However, oddly enough, if I do something that removes the user control after a post back, then trigger it to load again... the correct value will appear! It is only when the control being posted back is re-created that this behavior is present... which boggles my mind since I have implicitly turned off the viewstate.

Not to sound sour her, but frankly I have been a little disapointed with using Telerik controls in usercontrols. This isn't the first little annoying bug that I have run into and I suspect the issue is client side scripting (usual culprit).

answered on 22 Oct 2009, 05:04 AM

I changed my code to use the normal ASP.NET dropdown control and it works flawlessly :(

    
                    Dim _DD As New DropDownList() 
        
                    _DD.Width = New Unit("200px") 
        
                    _DD.ID = _PD.Name 
        
                    _DD.EnableViewState = False

                    Dim _Doc As XmlDocument = New XmlDocument() 
        
                    _Doc.Load(Server.MapPath(_ConfigFile)) 
        
                    Dim _ItemList As XmlNodeList = _Doc.SelectNodes("//Item") 
        
                    For Each _Item As XmlElement In _ItemList 
        
                        Dim _LI As New ListItem(_Item.GetAttribute("Text"), _Item.GetAttribute("Value")) 
        
                        _DD.Items.Add(_LI) 
        
                    Next 
        
                    _DD.SelectedValue = _PD.GetValue(_Node) 
        
                    PlaceHolder1.Controls.Add(_DD)

Which leads me to ask... what the heck is going on with the RadComboBox? I checked every single value and as far as I can tell everything appears to be set correctly, but when the text box renders client side, the selected value always resets to the value selected the first time the control loads.

answered on 18 Apr 2012, 02:33 PM

Hello all,

I got exactly the same behaviour:
http://www.telerik.com/community/forums/aspnet-ajax/combobox/combobox-selectedvalue-not-working.aspx#977218

The combo is part of a few controls being loaded dynamically, a RadNumericTextBox, a RadDatePicker and a RadComboBox
All works fine. Data is loaded like ecpercted. Then, I change the sel item of the combo. On postback controls are loaded (init) with old values(thats ok, from the init event, before viewstate is placed), then the selectedIndexChanged is triggered (fine), the controls are rebuilded, and I can see the right values being passed to the combo (and the others) but when done, the selectedvalue is trhe prev value and not the value I just selected while the other changes are still correct...

This all happens in a single page app whith dynamically loaded usercontrols.

' Text input for figure source

Dim rcb As New Telerik.Web.UI.RadComboBox

With rcb

.ID = "Input_FOID" & FOIdx & "_Source"

.Items.Clear()

.Items.Add(New Telerik.Web.UI.RadComboBoxItem("(Onbekend)", "(Onbekend)"))

.Items.Add(New Telerik.Web.UI.RadComboBoxItem("Interne cijfers", "Interne cijfers"))

.Items.Add(New Telerik.Web.UI.RadComboBoxItem("Concept cijfers accountant", "Concept cijfers accountant"))

.Items.Add(New Telerik.Web.UI.RadComboBoxItem("Gecons. concept cijfers accnt", "Gecons. concept cijfers accnt"))

.Items.Add(New Telerik.Web.UI.RadComboBoxItem("Officiële vennootsch. cijfers", "Officiële vennootsch. cijfers"))

.Items.Add(New Telerik.Web.UI.RadComboBoxItem("Officiële gecons. cijfers", "Officiële gecons. cijfers"))

.Items.Add(New Telerik.Web.UI.RadComboBoxItem("KvK/D&B cijfers", "KvK/D&B cijfers"))

.DropDownWidth = New Unit("220px")

.MarkFirstMatch = True

.Enabled = (ent_FinancialOverview.Locked Is Nothing)

.Width = New Unit("147px")

.ToolTip = "Source of figures"

End With

rcb.SelectedValue = ent_FinancialOverview.Source

'or...

rcb.SelectedIndex = rcb.FindItemByText(ent_FinancialOverview.Source).Index

Td.Controls.Add(rcb)

There is no databinding.

Erik

answered on 23 Apr 2012, 08:33 AM

sample.zip

Hi Erik,

I've made a sample page using the provided code snippet and everything is working properly on my side. The SelectedValue of the RadComboBox is the right one once a post-back occurs. I'm sending the sample page which I've been testing with so you could inspect it locally. The version of the controls which is

2012.1.411.

Greetings,
Dimitar Terziev
the Telerik team

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answered on 31 Jan 2013, 09:50 AM

I´m experience the same problem! I´m on a tight deadline and this is a real bump in the road, feels this is a standard feature that should not be a problem... I´m not using a usercontrol just a standard .aspx. It´s running in a sharepoint project thou.

ASPX:

<telerik:RadComboBox ID="rcbX" runat="server" DataValueField="Id" AllowCustomText="false"

EnableLoadOnDemand="true" OnClientSelectedIndexChanged="ClearYComboBox"

DataTextField="Namn" EmptyMessage="Choose X">

<WebServiceSettings Method="GetAllX" Path="/X.asmx" />

</telerik:RadComboBox>

Codebehind:



Page_Load:

private void LoadAllX()

{

try

{

var svc = new XService();

_X = svc.GetAllX();

rcbX.DataSource = _X;

rcbX.DataBind();

}

catch (Exception ex)

{

throw new Exception(ex.Message);

}

private void BindObject()

{

rcbX.SelectedValue = _object.X.Id.ToString();

}

answered on 05 Feb 2013, 08:47 AM

sample.zip

Hi Erik,

There had been two solution provided in the support ticket opened by PG. The first one was to create the RadComboBox in the page init event instead of the page load. The second one was to change the SelectedValue after the control is added to the controls collection of the page. The same page used in the support ticket is attached for reference.

All the best,
Dimitar Terziev
the Telerik team