controls disappear on Partial Postback

11 posts, 0 answers
  1. Lee Malo
    Lee Malo avatar
    29 posts
    Member since:
    Apr 2008

    Posted 04 May 2010 Link to this post

    I have a problem with 2 of my controls "disappearing" when I use the RadAjaxManager to update them when I click a button.

    Here is my button:
    <asp:Button runat="server" id="btnClick" OnClick="btnClick_Click" />

    Here is the btnClick_Click in my C# file:

            protected void btnClick_Click(object sender, EventArgs e)
            {
                SqlConnection myConn3 = new SqlConnection("Dataconnection");
                myConn3.Open();
               
                string getCategoryQueryString;
                getCategoryQueryString = "SELECT MasterTableCategories.MasterID, MasterTableCategories.SICCode, [Sic-Codes].[SIC Name1] AS Category FROM MasterTableCategories INNER JOIN [Sic-Codes] ON MasterTableCategories.SICCode = [Sic-Codes].[SIC Code1] WHERE (MasterTableCategories.MasterID = @MasterID)";

                SqlCommand getCategoryQuery = new SqlCommand(getCategoryQueryString, myConn3);
                getCategoryQuery.Parameters.Add("@MasterID", Master_RecordID.Value);
                SqlDataReader getCategoryReader = getCategoryQuery.ExecuteReader();

                if (getCategoryReader.HasRows)
                {
                    getCategoryReader.Read();
                    Category.Text = getCategoryReader["Category"].ToString();
                    SICCode.Value = getCategoryReader["SICCode"].ToString();
                }
                else
                {
                    //For testing purposes
                    Category.Text = "Cars";
                    SICCode.Value = "123456789";
                }
                getCategoryReader.Dispose();
                myConn3.Close();
            }

    Here is the Ajax:
        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" DefaultLoadingPanelID="RadAjaxLoadingPanel_CampaignChange">
          <AjaxSettings>
          <telerik:AjaxSetting AjaxControlID="btnClick">
              <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="Category" />
                <telerik:AjaxUpdatedControl ControlID="SICCode" />
             </UpdatedControls>
            </telerik:AjaxSetting>
          </AjaxSettings>
        </telerik:RadAjaxManager>

    Here are the controls:
    <asp:TextBox ID="Category" runat="server" Width="100%" ReadOnly="true"></asp:TextBox>
    <asp:HiddenField ID="SICCode" runat="server" Value="" />

    The user presses the button and the btnClick_Click goes to the database and retrieves the Category and SIC Code.  It's then supposed to update the controls with string data, but makes the ENTIRE textbox and hidden field disappear from the html.  All I am left with is an empty div...sort of.  It even removes the CategoryPanel div and SICCodePanel div from the html.

    If anyone has a clue why these controls vanish, I would appreciate it immensely!

  2. Dimo
    Admin
    Dimo avatar
    8332 posts

    Posted 07 May 2010 Link to this post

    Hello Lee Malo,

    Please check the following:

    1. Do you get a valid server response during the AJAX request?

    2. Are there any Javascript errors on the page?

    3. Is the page HTML markup valid?

    If all the points above seem OK, please send a simple runnable sample and we will inspect it locally. Thanks,

    Regards,
    Dimo
    the Telerik team

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  4. John
    John avatar
    3 posts
    Member since:
    Feb 2011

    Posted 21 Feb 2011 Link to this post

    Hi,
    Was there ever any outcome to this problem?  I'm having exactly the same issue.  The server side is assigning the correct value to the text box but when the page redisplays the text box has vanished.

    Thanks

    John
  5. Maria Ilieva
    Admin
    Maria Ilieva avatar
    4017 posts

    Posted 24 Feb 2011 Link to this post

    Hello John,

    Could you please elaborate a bit more on the scenario you have and provide answers of the previously posted support questions?



    Kind regards,
    Maria Ilieva
    the Telerik team
    Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat for a walk through all the exciting stuff we ship with the new release!
  6. John
    John avatar
    3 posts
    Member since:
    Feb 2011

    Posted 24 Feb 2011 Link to this post

    Certainly,

    I have an aspx page that contains a number of required text boxes.  One of the boxes can be optionally filled with a default value by pressing a button on the form.  Ajax is required to circumvent the posting of the whole form as most of the other required boxes will not be filled when the button is pressed.  So I set it up as follows...

    In the radajax manager settings I have

    <telerik:AjaxSetting AjaxControlID="btnCompName">

    <UpdatedControls>

    <telerik:AjaxUpdatedControl ControlID="txtComponentId"

    LoadingPanelID="loading" />

    </UpdatedControls>

    </telerik:AjaxSetting>


    Following the loading pannel set up is

    <telerik:RadCodeBlock ID="cb1" runat="server">

    <script type="text/javascript">

    function AjaxRequestButton(arguments)

    {

    var ajaxManager = $find("<%= RadAjaxManager1.ClientID %>");

    ajaxManager.ajaxRequestWithTarget('<%= btnCompName.UniqueID%>', '');

    }

    </script>

    </telerik:RadCodeBlock>

    Then in a form table I have.

    <

     

     

    td class="style6">

     

     

     

    <asp:TextBox ID="txtComponentId" runat="server" MaxLength="50" Width="200px"></asp:TextBox>

     

     

     

    &nbsp;

     

     

     

    &nbsp;

     

     

     

    <input type="button" onclick="AjaxRequestButton(); return false;" style="visibility:hidden" />

     

     

     

    <asp:Button ID='btnCompName' runat='server' CssClass='library_button' Height='23' Width='55'

     

     

     

     

    OnClick='btnCompName_Click' Text='Name it' />

     

     

     

    </td>

    In the code behind the page I have

     

     

     

     

    protected void btnCompName_Click(object sender, System.EventArgs e)

     

     

    {

     

     

     

    componentBLL objcomponentBLL = new componentBLL();

     

     

     

     

    string NextCID = objcomponentBLL.GiveCompName().ToString();

     

     

    txtComponentId.Text = NextCID;

     

     

     

    //btnCompName.Enabled = false;

     

     

    }

    When I press the button, the text box vanishes.  Tracing through the code shows that the text box is being set to the correct value.
     To answer the support questions, The server is sending the correct value, there's no java errors or html markup errors.  Apart from this issue, the rest of the page works perfectly.

    Any suggestions?

    Thanks in advance.

    John.


  7. Maria Ilieva
    Admin
    Maria Ilieva avatar
    4017 posts

    Posted 25 Feb 2011 Link to this post

    Hi Lee Malo,

    Could you please try adding setting into your RadAjaxManager settings in which the AjaxManager itself updates the mentioned textbox?
    Give this suggestion a try and let me know how it goes.

    Greetings,
    Maria Ilieva
    the Telerik team
    Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat for a walk through all the exciting stuff we ship with the new release!
  8. John
    John avatar
    3 posts
    Member since:
    Feb 2011

    Posted 01 Mar 2011 Link to this post

    Hi,
    Thanks for your reply.  I tried your suggestion but sadly it didn't make a difference.  The text box still dissappeared.  DO you have any other suggestions please?

    Kind Regards

    JOhn.
  9. Maria Ilieva
    Admin
    Maria Ilieva avatar
    4017 posts

    Posted 07 Mar 2011 Link to this post

    Hi Lee,


     It will be very helpful if you could open a regular support ticket and send us sample runnable application which demonstrates the issue you are facing. Thus we will be able to debug it locally and isolate the root cause of the presented problem.


    All the best,
    Maria Ilieva
    the Telerik team
    Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat for a walk through all the exciting stuff we ship with the new release!
  10. Calvin
    Calvin avatar
    26 posts
    Member since:
    Mar 2011

    Posted 02 Jun 2011 Link to this post

    I'm having the exact same problem, did we ever find out why this happens?
  11. Mahdi
    Mahdi avatar
    1 posts
    Member since:
    Aug 2012

    Posted 15 Sep 2014 Link to this post

    I know it's an old thread but exact same problem with 2014.1.403 trial!
    I am trying to replace AjaxControlToolkit with telerik. I have webusercontrol loaded and added dynamically at pageinit. This user control has a RadWindow. In the RadWindow when I do a partial postback using AjaxManagerProxy the affected controls dissapear from the RadWindow contents. Although I found them on the main page! 
    No js errors and postback does it job well on server side. The values are also correctly set.
    Any solution?!
  12. Maria Ilieva
    Admin
    Maria Ilieva avatar
    4017 posts

    Posted 18 Sep 2014 Link to this post

    Hello,

    In most cases the described issue appear when the UserControls are not properly loaded on the page. Please make sure that the controls are added on each postback.
    I would suggest you to open separate threads for the specific cases you have and post your page markup and related code behind. Thus we will be bale to further investigate your scenarios and advise you for possible solutions.

    Regards,
    Maria Ilieva
    Telerik
     

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