Home / Community & Support / Developer Productivity Tools Forums / ASP.NET AJAX > General Discussions > combobox SelectedIndexChanged event not fired intially when i ajaxify that control

• Chalam

  Posted on Feb 1, 2012 (permalink)

  combobox SelectedIndexChanged event not fired intially when i ajaxify that control for showing progressbar ,but it fired when click another combobox in same page(after progressbar stoped) so plz help me
  
  
  thanks in advance

  Reply

• Shinu MVP

  Posted on Feb 1, 2012 (permalink)

  Hello,
  
  Make sure that you have set AutoPostBack property as true. Please elaborate your scenario if it doesn't help.
  
  -Shinu.

  Reply


• Chalam

  Posted on Feb 2, 2012 (permalink)

  thanks for reply  i have already put autopostback property as true for all comboboxes but it's not working,
  
  this is my ASPX
  
  <form id="form1" runat="server">
      <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
      </telerik:RadScriptManager>
  
     <telerik:RadWindowManager ID="RadWindowManager1" runat ="server" ></telerik:RadWindowManager>
      <telerik:RadAjaxManager runat="server">
      <AjaxSettings>
       <telerik:AjaxSetting AjaxControlID ="RadComboBox1" EventName ="SelectedIndexChanged">
      <UpdatedControls >
     <%-- <telerik:AjaxUpdatedControl ControlID ="RadAjaxLoadingPanel1" />--%>
      <telerik:AjaxUpdatedControl ControlID ="RadComboBom1" LoadingPanelID ="RadAjaxLoadingPanel1" />
      <telerik:AjaxUpdatedControl ControlID ="RadComboBox2" LoadingPanelID="RadAjaxLoadingPanel1" />
      <telerik:AjaxUpdatedControl ControlID ="Button1" />
      </UpdatedControls>
      </telerik:AjaxSetting>
      <telerik:AjaxSetting AjaxControlID ="Button1">
      <UpdatedControls >
      <telerik:AjaxUpdatedControl ControlID ="Button1" LoadingPanelID ="RadAjaxLoadingPanel1" />
      <telerik:AjaxUpdatedControl ControlID ="RadGrid1" />
      </UpdatedControls>
      </telerik:AjaxSetting>
      <telerik:AjaxSetting AjaxControlID ="RadGrid1">
      <UpdatedControls>
      <telerik:AjaxUpdatedControl ControlID ="RadGrid1" LoadingPanelID ="RadAjaxLoadingPanel1" />
      <telerik:AjaxUpdatedControl ControlID ="Button1" />
      <telerik:AjaxUpdatedControl ControlID ="RadComboBox2" />
      <telerik:AjaxUpdatedControl ControlID ="RadTextBox2" />
      <telerik:AjaxUpdatedControl ControlID ="RadTextBox3" />
      </UpdatedControls>
      </telerik:AjaxSetting>
      </AjaxSettings>
      </telerik:RadAjaxManager>
  
  
      <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Vista" IsSticky ="True" CssClass ="loadingpanel">
          <%--<img src="images/loading.gif" alt="" />--%>
      </telerik:RadAjaxLoadingPanel>
           
      <table class="style1">
  
        
          <tr>
            
              <td>
                  <telerik:RadComboBox ID="RadComboBox1" Runat="server"
                      AutoPostBack="True" MarkFirstMatch="True" Width="204px" DropDownWidth="250px" Height="200px"
                      Skin="Web20" AppendDataBoundItems="True" EnableLoadOnDemand="True">
                  </telerik:RadComboBox>
              </td>
          </tr>
          <tr>
              <td class="style4">
                  &nbsp;</td>
              <td class="style2">
                  Name</td>
              <td>
                  <telerik:RadComboBox ID="RadComboBox2" Runat="server"
                      AutoPostBack="True" MarkFirstMatch="True" Width="204px" DropDownWidth="250px" Height="200px"
                      Skin="Web20" AppendDataBoundItems="True" EnableLoadOnDemand="True">
                  </telerik:RadComboBox>
              </td>
          </tr>
          <tr>
              <td class="style4">
                  &nbsp;</td>
              <td class="style2">
                  Age</td>
              <td>
                  <telerik:RadTextBox ID="RadTextBox2" Runat="server" Width="180px">
                  </telerik:RadTextBox>
              </td>
          </tr>
          <tr>
              <td class="style4">
                  &nbsp;</td>
              <td class="style2">
                  Address</td>
              <td>
                  <telerik:RadTextBox ID="RadTextBox3" Runat="server" Width="180px">
                  </telerik:RadTextBox>
              </td>
          </tr>
          <tr>
              <td class="style4">
                  &nbsp;</td>
              <td class="style2">
                  &nbsp;</td>
              <td>
                  <asp:Button ID="Button1" runat="server" Text="Search" />
                  &nbsp;&nbsp;
                  </td>
          </tr>
          <tr>
              <td class="style3" colspan="3">
                  <telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="False"
                      GridLines="None" PageSize="7"
                      Skin="Web20" Width="949px" AllowPaging="True"
                      AllowFilteringByColumn="True" AllowSorting="True" ShowGroupPanel="True">
                   
         <MasterTableView >
           <Columns >
           <telerik:GridEditCommandColumn ButtonType ="ImageButton" HeaderText ="Edit" >      
           </telerik:GridEditCommandColumn>
           <telerik:GridBoundColumn DataField ="id" HeaderText="id" UniqueName="id" >
           </telerik:GridBoundColumn>
           <telerik:GridBoundColumn HeaderText="Name" DataField ="name" UniqueName="name" >
           </telerik:GridBoundColumn>
           <telerik:GridBoundColumn HeaderText="pwd" UniqueName="pwd" DataField ="pwd" >
           </telerik:GridBoundColumn>
           <telerik:GridBoundColumn HeaderText="mobile" UniqueName="mobile" DataField ="mobile">
           </telerik:GridBoundColumn>
      </Columns>
  
  <EditFormSettings>
  <EditColumn UniqueName="EditCommandColumn"></EditColumn>
  </EditFormSettings>
  </MasterTableView>
   <ClientSettings AllowDragToGroup="True" EnableRowHoverStyle="True">
   <Selecting AllowRowSelect="true" />
                                  </ClientSettings>
                  </telerik:RadGrid>
              </td>
          </tr>
             </table>
      
   
      </form>
  
  
  without using the Ajax Settings  all are working fine but after using Ajax Settings the combo boxes are not populate values
  
  Hear My .VB is
  
  
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
          If Page.IsPostBack <> True Then
              RadComboBox1.Text = "Select"
              loadcombo()
              RadGrid1.Visible = False
  
          End If
      End Sub
      Protected Sub loadgrid()
          con.Open()
          Dim cmd As New MySqlCommand("select id,name,pwd,mobile from employee where id='" + RadComboBox1.SelectedItem.Text + "'", con)
          Dim da As New MySqlDataAdapter(cmd)
          Dim ds As New DataSet
          da.Fill(ds)
          RadGrid1.DataSource = ds
          RadGrid1.DataBind()
          RadGrid1.Visible = True
          con.Close()
      End Sub
      Protected Sub loadcombo()
  
          System.Threading.Thread.Sleep(2000)
          con.Open()
          Dim cd As New MySqlCommand("select distinct id from employee ", con)
          Dim adp As New MySqlDataAdapter(cd)
          Dim ds As New DataSet
          adp.Fill(ds)
          RadComboBox1.DataSource = ds
          RadComboBox1.DataTextField = "id"
          RadComboBox1.DataValueField = "id"
          RadComboBox1.DataBind()
          con.Close()
  
      End Sub
      Protected Sub loadcombo1()
          con.Open()
          Dim combo As New MySqlCommand("select name from employee where id='" + RadComboBox1.SelectedItem.Text + "'", con)
          Dim ad1 As New MySqlDataAdapter(combo)
          Dim ds1 As New DataSet
          ad1.Fill(ds1)
          RadComboBox2.DataSource = ds1
          RadComboBox2.Items.Clear()
          RadComboBox2.DataTextField = "name"
          RadComboBox2.DataValueField = "name"
          RadComboBox2.DataBind()
          con.Close()
      End Sub
      Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
  
          System.Threading.Thread.Sleep(2000)
  
          If RadComboBox1.SelectedIndex > 0 Then
              loadgrid()
  
          Else
              con.Open()
              Dim cm As New MySqlCommand("select * from employee where id='" + RadComboBox1.SelectedItem.Text + "'", con)
              Dim dap As New MySqlDataAdapter(cm)
              Dim dss As New DataSet
              dap.Fill(dss)
              RadGrid1.DataSource = dss
              RadGrid1.DataBind()
              RadGrid1.Visible = True
              con.Close()
          End If
  
      End Sub
  
      Protected Sub RadGrid1_EditCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles RadGrid1.EditCommand
  
          System.Threading.Thread.Sleep(2000)
  
          e.Item.Edit = False
          Dim index As Integer = e.Item.ItemIndex
          Session("ID") = RadGrid1.Items(index).Item("id").Text
          RadComboBox1.Text = RadGrid1.Items(index).Item("id").Text.Replace("&nbsp;", "")
          RadComboBox2.Text = RadGrid1.Items(index).Item("name").Text.Replace("&nbsp;", "")
          RadTextBox2.Text = RadGrid1.Items(index).Item("pwd").Text.Replace("&nbsp;", "")
          RadTextBox3.Text = RadGrid1.Items(index).Item("mobile").Text.Replace("&nbsp;", "")
      End Sub
  
   
      Protected Sub RadComboBox1_SelectedIndexChanged(o As Object, e As Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs) Handles RadComboBox1.SelectedIndexChanged
          System.Threading.Thread.Sleep(2000)
          RadComboBox2.Text = "Select"
          loadcombo1()
      End Sub
  
      Protected Sub RadGrid1_NeedDataSource(source As Object, e As Telerik.Web.UI.GridNeedDataSourceEventArgs) Handles RadGrid1.NeedDataSource
          System.Threading.Thread.Sleep(1000)
          If Not Session("GRDSEARCH") Is Nothing Then
              RadGrid1.DataSource = CType(Session("GRDSEARCH"), DataTable)
          End If
      End Sub
  End Class
  
  so plz help me
  
  thanks in advance

  Reply

• Ivana Ivana

  Posted on Feb 6, 2012 (permalink)

  Hi,
  
  The issues might be caused by the syntax error RadComboBom1 which should be RadComboBox1:
  

  <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">

      <AjaxSettings>

          <telerik:AjaxSetting AjaxControlID="RadComboBox1" EventName="SelectedIndexChanged">

              <UpdatedControls>

                  <%-- <telerik:AjaxUpdatedControl ControlID ="RadAjaxLoadingPanel1" />--%>

                  <telerik:AjaxUpdatedControl ControlID="RadComboBom1" LoadingPanelID="RadAjaxLoadingPanel1" />

                  <telerik:AjaxUpdatedControl ControlID="RadComboBox2" LoadingPanelID="RadAjaxLoadingPanel1" />

                  <telerik:AjaxUpdatedControl ControlID="Button1" />

              </UpdatedControls>

          </telerik:AjaxSetting>

          <telerik:AjaxSetting AjaxControlID="Button1">

              <UpdatedControls>

                  <telerik:AjaxUpdatedControl ControlID="Button1" LoadingPanelID="RadAjaxLoadingPanel1" />

                  <telerik:AjaxUpdatedControl ControlID="RadGrid1" />

              </UpdatedControls>

          </telerik:AjaxSetting>

          <telerik:AjaxSetting AjaxControlID="RadGrid1">

              <UpdatedControls>

                  <telerik:AjaxUpdatedControl ControlID="RadGrid1" LoadingPanelID="RadAjaxLoadingPanel1" />

                  <telerik:AjaxUpdatedControl ControlID="Button1" />

                  <telerik:AjaxUpdatedControl ControlID="RadComboBox2" />

                  <telerik:AjaxUpdatedControl ControlID="RadTextBox2" />

                  <telerik:AjaxUpdatedControl ControlID="RadTextBox3" />

              </UpdatedControls>

          </telerik:AjaxSetting>

      </AjaxSettings>

  </telerik:RadAjaxManager>

  <telerik:RadComboBox ID="RadComboBox1" runat="server" AutoPostBack="True" MarkFirstMatch="True"

      Width="204px" DropDownWidth="250px" Height="200px" Skin="Web20" AppendDataBoundItems="True"

      EnableLoadOnDemand="True">

  </telerik:RadComboBox>

  
  I hope this helps.
  
  Greetings,
  Ivana
  the Telerik team

  Sharpen your .NET Ninja skills! Attend Q1 webinar week and get a chance to win a license! Book your seat now >>

  Reply

• Chalam

  Posted on Feb 7, 2012 (permalink)

  Thanks for reply
  i have modify that ID but still it's not working once again i have to explain my problem is the ComboBox2 is loads with some data based on selecting ComboBox1 with showing progressbar
  
  Hear My SourceCode is
  
  <form id="form1" runat="server">
      <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
      </telerik:RadScriptManager>
  
     <telerik:RadWindowManager ID="RadWindowManager1" runat ="server" ></telerik:RadWindowManager>
      <telerik:RadAjaxManager runat="server">
          <AjaxSettings>
              <telerik:AjaxSetting AjaxControlID="RadComboBox1" EventName ="SelectedIndexChanged">
                  <UpdatedControls>
                   <telerik:AjaxUpdatedControl ControlID="RadAjaxLoadingPanel1" />
                    <telerik:AjaxUpdatedControl ControlID="RadComboBox1"
                          LoadingPanelID="RadAjaxLoadingPanel1" />
                      <telerik:AjaxUpdatedControl ControlID="RadComboBox2"
                          LoadingPanelID="RadAjaxLoadingPanel1" />
                  </UpdatedControls>
              </telerik:AjaxSetting>
          </AjaxSettings>
                 
      </telerik:RadAjaxManager>
  
  
      <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Skin="Vista" IsSticky ="True" CssClass ="loadingpanel">
        
      </telerik:RadAjaxLoadingPanel>
           
      <table class="style1">
  
        
          <tr>
              <td class="style4">
  
                  &nbsp;</td>
              <td class="style2">
                  Id</td>
              <td>
                  <telerik:RadComboBox ID="RadComboBox1" Runat="server"
                      AutoPostBack="True" MarkFirstMatch="True" Width="204px" DropDownWidth="250px" Height="200px"
                      Skin="Web20" AppendDataBoundItems="True" EnableLoadOnDemand="True">
                  </telerik:RadComboBox>
              </td>
          </tr>
          <tr>
              <td class="style4">
                  &nbsp;</td>
              <td class="style2">
                  Name</td>
              <td>
                  <telerik:RadComboBox ID="RadComboBox2" Runat="server"
                      AutoPostBack="True" MarkFirstMatch="True" Width="204px" DropDownWidth="250px" Height="200px"
                      Skin="Web20" AppendDataBoundItems="True" >
                  </telerik:RadComboBox>
              </td>
          </tr>
          <tr>
              <td class="style4">
                  &nbsp;</td>
              <td class="style2">
                  Age</td>
              <td>
                  <telerik:RadTextBox ID="RadTextBox2" Runat="server" Width="180px">
                  </telerik:RadTextBox>
              </td>
          </tr>
          <tr>
              <td class="style4">
                  &nbsp;</td>
              <td class="style2">
                  Address</td>
              <td>
                  <telerik:RadTextBox ID="RadTextBox3" Runat="server" Width="180px">
                  </telerik:RadTextBox>
              </td>
          </tr>
          <tr>
              <td class="style4">
                  &nbsp;</td>
              <td class="style2">
                  &nbsp;</td>
              <td>
                  <asp:Button ID="Button1" runat="server" Text="Search" />
                  &nbsp;&nbsp;
                  </td>
          </tr>
          <tr>
              <td class="style3" colspan="3">
                  
                  <telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="False"
                      GridLines="None" PageSize="7"
                      Skin="Web20" Width="949px" AllowPaging="True"
                      AllowFilteringByColumn="True" AllowSorting="True" ShowGroupPanel="True">
                   
         <MasterTableView >
           <Columns >
           <telerik:GridEditCommandColumn ButtonType ="ImageButton" HeaderText ="Edit" >      
           </telerik:GridEditCommandColumn>
           <telerik:GridBoundColumn DataField ="id" HeaderText="id" UniqueName="id" >
           </telerik:GridBoundColumn>
           <telerik:GridBoundColumn HeaderText="Name" DataField ="name" UniqueName="name" >
           </telerik:GridBoundColumn>
           <telerik:GridBoundColumn HeaderText="pwd" UniqueName="pwd" DataField ="pwd" >
           </telerik:GridBoundColumn>
           <telerik:GridBoundColumn HeaderText="mobile" UniqueName="mobile" DataField ="mobile">
           </telerik:GridBoundColumn>
      </Columns>
  
  <EditFormSettings>
  <EditColumn UniqueName="EditCommandColumn"></EditColumn>
  </EditFormSettings>
  </MasterTableView>
   <ClientSettings AllowDragToGroup="True" EnableRowHoverStyle="True">
   <Selecting AllowRowSelect="true" />
                                  </ClientSettings>
                  </telerik:RadGrid>
              </td>
          </tr>
      </table>
      
   
      </form>
  
  
  
  Hear My VB is
  
   Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
          If Page.IsPostBack <> True Then
              RadComboBox1.Text = "Select"
              loadcombo()
              RadGrid1.Visible = False
  
          End If
      End Sub
      'Protected Sub RadGrid1_PreRender(ByVal sender As Object, ByVal e As EventArgs) Handles RadGrid1.PreRender
      '    If RadGrid1.SelectedItems.Count = 0 Then
      '        RadGrid1.Items(0).Selected = True
      '    End If
      'End Sub
      'Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
      '    If RadComboBox1.SelectedIndex = 0 Then
      '        RadComboBox1.SelectedIndex.
  
      '    End If
      'End Sub
      Protected Sub loadgrid()
          con.Open()
          Dim cmd As New MySqlCommand("select id,name,pwd,mobile from employee where id='" + RadComboBox1.SelectedItem.Text + "'", con)
          Dim da As New MySqlDataAdapter(cmd)
          Dim ds As New DataSet
          da.Fill(ds)
          Session("Chalam") = ds
          RadGrid1.DataSource = ds
          RadGrid1.DataBind()
          RadGrid1.Visible = True
          con.Close()
      End Sub
      Protected Sub loadcombo()
  
          System.Threading.Thread.Sleep(2000)
          con.Open()
          Dim cd As New MySqlCommand("select distinct id from employee ", con)
          Dim adp As New MySqlDataAdapter(cd)
          Dim ds As New DataSet
          adp.Fill(ds)
          RadComboBox1.DataSource = ds
          RadComboBox1.DataTextField = "id"
          RadComboBox1.DataValueField = "id"
          RadComboBox1.DataBind()
          con.Close()
  
      End Sub
      Protected Sub loadcombo1()
          con.Open()
          Dim combo As New MySqlCommand("select name from employee where id='" + RadComboBox1.SelectedItem.Text + "'", con)
          Dim ad1 As New MySqlDataAdapter(combo)
          Dim ds1 As New DataSet
          ad1.Fill(ds1)
          RadComboBox2.DataSource = ds1
          RadComboBox2.Items.Clear()
          RadComboBox2.DataTextField = "name"
          RadComboBox2.DataValueField = "name"
          RadComboBox2.DataBind()
          con.Close()
      End Sub
      Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
  
          System.Threading.Thread.Sleep(2000)
  
          If RadComboBox1.SelectedIndex > 0 Then
              loadgrid()
  
          Else
              con.Open()
              Dim cm As New MySqlCommand("select * from employee where id='" + RadComboBox1.SelectedItem.Text + "'", con)
              Dim dap As New MySqlDataAdapter(cm)
              Dim dss As New DataSet
              dap.Fill(dss)
              RadGrid1.DataSource = dss
              RadGrid1.DataBind()
              RadGrid1.Visible = True
              con.Close()
          End If
  
      End Sub
  
      Protected Sub RadGrid1_EditCommand(ByVal source As Object, ByVal e As Telerik.Web.UI.GridCommandEventArgs) Handles RadGrid1.EditCommand
          System.Threading.Thread.Sleep(2000)
          e.Item.Edit = False
          Dim index As Integer = e.Item.ItemIndex
          RadComboBox1.Text = RadGrid1.Items(index).Item("id").Text.Replace("&nbsp;", "")
          RadComboBox2.Text = RadGrid1.Items(index).Item("name").Text.Replace("&nbsp;", "")
          RadTextBox2.Text = RadGrid1.Items(index).Item("pwd").Text.Replace("&nbsp;", "")
          RadTextBox3.Text = RadGrid1.Items(index).Item("mobile").Text.Replace("&nbsp;", "")
  
      End Sub
  
  
      Protected Sub RadComboBox1_SelectedIndexChanged(o As Object, e As Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs) Handles RadComboBox1.SelectedIndexChanged
          System.Threading.Thread.Sleep(2000)
          RadComboBox2.Text = "Select"
          RadTextBox2.Text = ""
          RadTextBox3.Text = ""
          loadcombo1()
      End Sub
  
      Protected Sub RadGrid1_NeedDataSource(source As Object, e As Telerik.Web.UI.GridNeedDataSourceEventArgs) Handles RadGrid1.NeedDataSource
          System.Threading.Thread.Sleep(1000)
          If Not Session("Chalam") Is Nothing Then
              RadGrid1.DataSource = CType(Session("Chalam"), DataSet)
          End If
      End Sub
  End Class
  
  Plz help me
  Thanks in advance

  Reply

• Ivana Ivana

  Posted on Feb 9, 2012 (permalink)

  Hi,
  
  I have closed your second thread concerning this matter. To avoid duplications and misunderstanding I would suggest to continue our conversation here.
  
  As for the issue you experience, take a look at the attached sample showing that SelectedIndexChanged event  is fired as it should when the  index is changed.
  If you also want to update the RadDataGrid when a button is clicked, you should add the following settings to the RadAjaxManager:
  
  

  <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" EnableAJAX="false">

      <AjaxSettings>

          <%--<telerik:AjaxSetting AjaxControlID="RadComboBox1" EventName="OnSelectedIndexChanged">

              <UpdatedControls>

                  <telerik:AjaxUpdatedControl ControlID="RadComboBox1" LoadingPanelID="RadAjaxLoadingPanel1" />

                  <telerik:AjaxUpdatedControl ControlID="RadComboBox2" LoadingPanelID="RadAjaxLoadingPanel1" />

              </UpdatedControls>

          </telerik:AjaxSetting>--%>

          <telerik:AjaxSetting AjaxControlID="Button1" EventName="OnSelectedIndexChanged">

              <UpdatedControls>

                  <telerik:AjaxUpdatedControl ControlID="RadGrid1" LoadingPanelID="RadAjaxLoadingPanel1" />

              </UpdatedControls>

          </telerik:AjaxSetting>

      </AjaxSettings>

  </telerik:RadAjaxManager>

  
  Also, what is the version of our controls that you are using?
  
  Greetings,
  Ivana
  the Telerik team

  Sharpen your .NET Ninja skills! Attend Q1 webinar week and get a chance to win a license! Book your seat now >>

  Attached files

  • SelectedIndex-Changed-VB.zip

  Reply

• Chalam

  Posted on Feb 14, 2012 (permalink)

  Thanks for reply
   I want to show progressbar when selecting first combobox  and load second combobox after progressbar stoped
  and my Rad controls Version is     Version 2009.2.701.20 from Telerik .NET component
  and i am using MVS 2010
  
  Thanks in advance

  Reply

• Ivana Ivana

  Posted on Feb 16, 2012 (permalink)

  Hello,
  
  Try to use the technique used in the following online demo: Related RadComboBoxes. It shows related RadComboBoxes scenario were the items are requested on demand.
  
  The Country RadComboBox makes a request for its items when the selected index of the Continent RadComboBox is changed. It uses the client event OnClientSelectedIndexChanged of Continent RadComboBox where the requestItems() method  for Country RadComboBox is called and the request is handled in the server-side ItemsRequested event.
  
  You could refer to the implementation of the aforementioned online demo for more information and the online documentation.
  
  Kind regards,
  Ivana
  the Telerik team

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  Reply

• Chalam

  Posted on Feb 20, 2012 (permalink)

  Thanks for replay
  
  my requirement is to show progressbar through Ajaxsettings in RadAjaxmanager when i select first combobox
  
  plz help me
  
  thanks in advance
  

  Reply

• Ivana Ivana

  Posted on Feb 23, 2012 (permalink)

  Hello,
  
  Attached is an example which demonstrates how to show the AjaxLoadingPanel when the selected index of the first RadComboBox is changed.
  To learn more about RadAjax you can refer to its online documentation:
  [http://www.telerik.com/help/aspnet-ajax/ajx-how-it-works.html].
  
  I hope this helps.
  
  Kind regards,
  Ivana
  the Telerik team

  If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed now.

  Attached files

  • Ajaxified-LoadOnDemand-RadComboBox.zip

  Reply

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