ComboBox SelectedValue Not Working

[Praveen]

The SelectedValue is working in the WebPage but if you create a usercontrol and put the RadComboBox and try to set the

SelectedValue it is not working. Any idea why it is behaving like this?

[Adam]

Hi,

We are experienceing this as well.

The Selected value is being set but is not displaying in the rendered combobox.

This is quite a serious issue for us so could you advise of the fix or work around ASAP.

Thanks.

[Helen]

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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[Absolute Data Group]

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).

[Absolute Data Group]

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.

[Veselin Vasilev]

Hi John Martinez,

I believe the best way to answer your question is to reproduce the problem locally first. Please open a support ticket and attach a running project there.
Thanks

All the best,
Veselin Vasilev
the Telerik team

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[Ryan]

Hello Telerik Team,

I am having this same (almost exact) problem, was there ever a solution to this issue?? The thread just died with no resolution...

Thank you.

[Dimitar Terziev]

Hello Ryan,

Please specify what exactly is the problem you are experiencing and provide information on the particular implementation so we could help you out. 

Greetings,
Dimitar Terziev
the Telerik team

[Dave]

I am having this issue as well when the combobox is inside a user control. See my recent post about ComboBox.Text not showing the selected item text. Please fix this...

[Dave]

Is there a known problem in this area or not? Thanks...

[Dimitar Terziev]

Hello Dave,

I've already responded to your problem in this forum thread here. In case this is a different issue, please accept my apologies and provide me with more information about the implementation  of your scenario.

All the best,
Dimitar Terziev
the Telerik team

[Erik]

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

[Dimitar Terziev]

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

[King Du]

I am seeing the same exact problem, was anyone able to workaround it?

-pg

[Erik]

Hello PG,

I did not check any futher, I just replaced the combo with a MS Combobox because I did not have the time to investigate. (I still do not... )

Regards,

Erik

[King Du]

Thanks for the response Erik, I ended up creating a very simple project which reproduces my problem and opened a support ticket. Doesn't look like I can attach the project to this thread so you can see it but I will let you know once I hear back from Telerik.

-pg

[Erik]

That's great PG! And please keep me informed!

Erik

[David]

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();

        }

[Erik]

Hello David and Telerik,


I'm also curious about a solution.

PG created a sample problem project and created a support ticket. 

How did that work out?


Regards,

Erik

[Dimitar Terziev]

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

[Erik]

Thanks Dimitar.

Had the problem today again. It does seem logical to load items on init, because of the viewstate: I now had a combobox in a radgrid edit form on a usercontrol. The usercontrol is dynamically loaded. When the combobox loads elements on load, I can imagine the selectedValue property to be reset... Doing it in the init of the combobox loads the elements before the viewstate is put back.

Erik

[Wes]

I believe that I've found a solution to this exact problem, at least in my situation. 

Before you set the .SelectedValue call the .ClearSelection() method.  In my case, where the combo box is tied to an object data source on the page, this caused the selected value to actually update on EVERY attempt.

Assume you have a combo box named called radCombo1

radCombo1.ClearSelection()
radCombo1.SelectedValue = "TheOneIWant"

[Jennifer]

.

[Rob]

Perfect! That worked for me.