Blank Combobox after postback

[Kris]

Hello,

I want to achieve that when a user makes a selection with the combobox (cboVolgnr) 016 in my example (see pic), the results comes up and the user wants to clean up his selection but the selection is still there. I thought that the code was complete but it still doesn't works... My code:

 

<td style="width:50px">Volgnr</td>

<td style="width:75px"><telerik:RadComboBox ID="cboVolgnr" Runat="server" Width="75px" Filter="StartsWith"><HeaderTemplate>
<ul><li class="colvolg1">Volgnr</li><li class="colvolg2">Code</li><li class="colvolg3">EI</li><li class="colvolg4">Omschr</li></ul></HeaderTemplate>

 

<ItemTemplate>

 

<ul>

 

<li class="colvolg1"><%#Eval("Volgnr")%></li >

 

<li class="colvolg2"><%#Eval("Code")%></li >

 

<li class="colvolg3"><%#Eval("EI")%></li>

 

<li class="colvolg4"><%#Eval("Omschr")%></li >

 

</ul >

 

</ItemTemplate>

 

</telerik:RadComboBox>

 

</td >

cboVolgnr.Text = ""

 

 

 

 

 

 

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me

 

.Load

 

 

 

 

 

    Dim cn As New SqlConnection(cnnBN.ToString), cmd As SqlCommand, dr As

 

SqlDataReader

 

 

 

 

 

    Dim strSQL As String = "SELECT * FROM tblBWPeriodes WHERE DJ = "

 

& strDJ

 

 

 

 

 

    Try

 

 

 

 

        cn.Open()

 

 

 

 

        cmd = New SqlCommand(strSQL, cn)

 

 

 

 

        dr = cmd.ExecuteReader

 

 

        combo.DataTextField = 

 

"volgnr"

 

 

 

 

        combo.DataValueField = "volgnr"

 

 

 

 

        combo.DataSource = dr

 

 

 

 

        combo.DataBind()

 

 

        combo.Skin = 

 

"Office2007"

 

 

 

 

    Catch ex As Exception

 

 

 

 

        Throw ex

 

 

 

 

    End

 

Try

 

 

 

    dr = Nothing

 

 

 

 

    cmd = Nothing

 

 

 

 

    cn.Dispose()

 

 

 

 

    cn = Nothing

 

 

 

 

    cboVolgnr.HighlightTemplatedItems = True

 

 

 

 

    cboVolgnr.AllowCustomText = True

 

 

 

 

    cboVolgnr.EmptyMessage = "Alles"

 

 

 

 

    cboVolgnr.DropDownWidth = 500

 

 

     cboVolgnr.Height = 375

 

 

 

End

 

Sub

 

Protected Sub btnCriteria_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles

 

btnCriteria.Click

 

 

 

...

 

 

 

 

    cboVolgnr.Text = ""

 

 

 

 

End

 

Sub

Is there something I am missing?  Can you give me a help?

Kind regards,
Kris

 

 

 

 

 

 

 

 

 

 

 

[Kris]

No one has the answer?

[Kalina]

Hello Kris,

In general when RadComboBox control is "read-only" - there is always a selected item in it.
You can overcome the issue by setting the AllowCustomText property of the RadComboBox to "true".
I created a small example for you - please find it attached.

All the best,
Kalina
the Telerik team

[Kris]

Hello Kalina,

Thank you for the answer.  I did the set=true of AllowCustomText but I saw in your code that you also used the clearselection() which I did not.  That did it!  Now it works.  That you very much;

Kind regards,
Kris