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AutoCompleteSeparator prevents update of Text in a databound RadComboBox

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Kit West
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Kit West asked on 07 Jun 2010, 07:56 PM
It appears that the AutoCompleteSeparator property prevents the Text property from being updated in a databound RadComboBox when the SelectedIndex is changed during an AJAX postback. (So I click the Reset button, and the SelectedIndex gets set programmatically to 0, as intended, but users still see the previously selected text in the control.)

 

<telerik:RadComboBox ID="MyComboBox" runat="server" Width="250" CausesValidation="false" AutoPostBack="false" MarkFirstMatch="true" AllowCustomText="false" AutoCompleteSeparator=";" ExpandAnimation-Duration="250" AccessKey="O" /> 

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Kalina
Telerik team
answered on 10 Jun 2010, 04:03 PM
Hi Kit West,

The issue that you describe is very interesting, I tried to reproduce it on our side but unfortunately without success.
What is the exact scenario that you are trying to implement?
Could you please paste here some sample code that illustrates the issue using the "Format Code Block" tool?
Thank you in advance.

Regards,
Kalina
the Telerik team

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Kit West
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answered on 10 Jun 2010, 05:35 PM
Here is the markup (simplified) to reproduce the problem:
<%@ Page Language="vb" EnableEventValidation="false" ValidateRequest="false" AutoEventWireup="false" 
  Inherits="MyNamespace.MyPage" CodeFile="MyPage.aspx.vb" Title="Demo" ViewStateEncryptionMode="Never" %> 
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> 
<html> 
<head id="Head1" runat="server">  
  <title>demo</title> 
</head> 
<body> 
  <form id="Form1" method="post" runat="server">  
  <ajax:ScriptManager ID="asm" runat="server" EnablePartialRendering="true" /> 
  <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" EnableAJAX="true">  
    <AjaxSettings> 
      <telerik:AjaxSetting AjaxControlID="btnReset">  
        <UpdatedControls> 
          <telerik:AjaxUpdatedControl ControlID="ErrorsDiv" /> 
          <telerik:AjaxUpdatedControl ControlID="LookupDiv" /> 
        </UpdatedControls> 
      </telerik:AjaxSetting> 
    </AjaxSettings> 
  </telerik:RadAjaxManager> 
  <div id="LookupDiv" runat="server">  
    <telerik:RadComboBox ID="RadComboBox1" runat="server" CausesValidation="false" AutoPostBack="false" 
      AutoCompleteSeparator=";" /> 
    <asp:Button ID="btnReset" runat="server" Text="Reset" CausesValidation="false" /> 
  </div> 
  <div id="ErrorsDiv" runat="server">  
  </div> 
  </form> 
</body> 
</html> 

And here is the code-behind:
Option Strict On  
 
Imports System  
Imports System.Diagnostics  
Imports Telerik.Web.UI  
 
Namespace MyNamespace
 
  Partial Class MyPage : Inherits Page  
 
    Protected Sub MyPage_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load  
      ErrorsDiv.InnerText = "" 
      If Not Page.IsPostBack Then  
        RadComboBox1.Items.Insert(0, New RadComboBoxItem("0", "0"))  
        RadComboBox1.Items.Insert(1, New RadComboBoxItem("1", "1"))  
      End If  
    End Sub  
 
    Protected Sub btnReset_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnReset.Click  
      RadComboBox1.SelectedIndex = 0 
      ErrorsDiv.InnerText = "SelectedValue: " & RadComboBox1.SelectedValue _  
                & ", SelectedIndex: " & RadComboBox1.SelectedIndex.ToString _  
                & ", Text: " & RadComboBox1.Text  
    End Sub  
  End Class  
End Namespace 

Select a value from the drop-down, then click Reset. Although the Reset button changes the SelectedIndex, the Text of the RadComboBox is not changed. When I remove the AutoCompleteSeparator tag, it works as I would expect.
(It may be related to the AjaxSettings.)
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Kalina
Telerik team
answered on 16 Jun 2010, 12:31 PM
Hello Kit West,

Thank you for the sample code provided.
You are right - the Text property is not changed after setting the SelectedIndex of the RadComboBox.

Let me suggest you handle OnClientClick event of the button and clear the RadComboBox selection like this:

<body>
    <form id="form1" runat="server">
    <div>
        <telerik:RadScriptManager runat="server" ID="RadScriptManager1" />
        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" EnableAJAX="true">
            <AjaxSettings>
                <telerik:AjaxSetting AjaxControlID="btnReset">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="ErrorsDiv" />
                        <telerik:AjaxUpdatedControl ControlID="LookupDiv" />
                    </UpdatedControls>
                </telerik:AjaxSetting>
            </AjaxSettings>
        </telerik:RadAjaxManager>
        <div id="LookupDiv" runat="server">
            <telerik:RadComboBox ID="RadComboBox1" runat="server"
                CausesValidation="false" AutoPostBack="false" AutoCompleteSeparator=";"/>
            <asp:Button ID="btnReset" runat="server" Text="Reset"
                CausesValidation="false" OnClick="btnReset_Click"
                OnClientClick="OnClientClickHandler()" />
 
            <script type="text/javascript">
                function OnClientClickHandler() {
                    var combo = $find("<%=RadComboBox1.ClientID %>");
                    combo.clearSelection();
                }
            </script>
 
        </div>
        <div id="ErrorsDiv" runat="server">
        </div>
    </form>
</body>

I hope this helps.

Best wishes,
Kalina
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Kit West
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answered on 18 Jun 2010, 04:13 PM
Kalina,
Thank you for your response. Actually, I don't need a work-around, since I can just omit the AutoCompleteSeparator property altogether. (Also, I'm not sure the combo.clearSelection() call would display the first item, as my server logic on the click event does.)

What I would prefer is an acknowledgement of a "bug" from Telerik. This issue cost significant time to isolate, and I am posting in the hope that others will be able to troubleshoot this more efficiently.

Best regards,
Kit
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Kalina
Telerik team
answered on 25 Jun 2010, 12:34 PM
Hi Kit West,

Thank you for taking the time to isolate this issue and providing a sample code to illustrate it.
Please excuse us for any inconvenience this may have caused.

We have already started investigating this issue and will continue our efforts to find a solution.

Kind regards,
Kalina
the Telerik team
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Kit West
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Kalina
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Kit West
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