Error: Microsoft JScript runtime error: 'get_postBackElement().id' is null or not an object

[ALBERT]

I put the code so please help me with this problem and being able to solve. thanks

<%

@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

 <%@ Register Assembly="CrystalDecisions.Web, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"

 Namespace="CrystalDecisions.Web" TagPrefix="CR" %>

 <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc2" %>

 <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">

 <telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">

    <script language="javascript" type="text/javascript">

     function onRequestStart(sender, args) {

         if (args.get_eventTarget().indexOf("ExportToExcelButton") >= 0) {

                 args.set_enableAjax(false);

                 }

       }

 </script>

</telerik:RadScriptBlock>

<table>

<tr>

 <td style="width: 100px; height: 21px">

 <asp:Label ID="LblTituloReporte" runat="server" SkinID="TituloPaginasAdm" Text="Clientes"

 Width="786px"></asp:Label><br />

 <br />

 </td>

 </tr>

 <tr>

 <td>

 <table>

 <tr>

 <td>

 <asp:Label ID="LbClientes" runat="server" CssClass="FormatLabels" SkinID="TitleLabel"

 Text="Cliente" Width="145px"></asp:Label>

 </td>

 <td style="width: 245px">

 <asp:DropDownList ID="DropDownList1Abecedario" runat="server" Font-Names="verdana"

 AutoPostBack="true" Font-Size="10pt" Width="150px" OnSelectedIndexChanged="DropDownList1Abecedario_OnSelectedIndexChanged">

 <asp:ListItem Value="0">----</asp:ListItem>

 <asp:ListItem Value="1">A-C</asp:ListItem>

 <asp:ListItem Value="2">D-F</asp:ListItem>

 <asp:ListItem Value="3">G-I</asp:ListItem>

 <asp:ListItem Value="4">J-L</asp:ListItem>

 <asp:ListItem Value="5">M-O</asp:ListItem>

 <asp:ListItem Value="6">P-R</asp:ListItem>

 <asp:ListItem Value="7">S-U</asp:ListItem>

 <asp:ListItem Value="8">V-Z</asp:ListItem>

 </asp:DropDownList>

 <asp:UpdatePanel ID="UpdatePanel1" runat="server">

 <ContentTemplate>

 <asp:DropDownList ID="DropDownList1Organizador" runat="server" Font-Names="verdana"

 Font-Size="10pt" Width="380px">

 </asp:DropDownList>

 </ContentTemplate>

 <Triggers>

 <asp:AsyncPostBackTrigger ControlID="DropDownList1Abecedario" EventName="SelectedIndexChanged" />

 </Triggers>

 </asp:UpdatePanel>

 </td>

 <td style="width: 99px;">

<telerik:RadButton ID="ImgConsultar" Text="Consultar" runat="server" Skin="Hay" OnClick="ImgConsultar_Click">

 </telerik:RadButton>

 </td>

 </tr>

 <tr>

 <td>

 &nbsp;

 </td>

 <td>

 &nbsp;

 <asp:CheckBox ID="chkVerTodos" Text="Ver todos los clientes" AutoPostBack="true"

 OnCheckedChanged="chkVerTodos_OnCheckedChanged" runat="server" />

 </td>

 <td>

 </td>

 </tr>

 </table>

 <br />

 </td>

 </tr>

 </table>

 <table>

 <tr>

 <td style="width: 121px">

 &nbsp;

 <asp:Label ID="LbTituloCliente" runat="server" CssClass="FormatLabels" SkinID="TituloPaginasAdm"

 Text="Cliente" Visible="false" Width="660px"></asp:Label>

 <asp:Label ID="LbIngresoDatos" runat="server" CssClass="FormatLabels" Enabled="false"

 SkinID="TituloPaginasAdm" Text="Ingreso de datos" Visible="false" Width="160px"></asp:Label>

 </td>

 <td>

 </td>

 <td>

 </td>

 </tr>

 <tr>

 <td>

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

 <ClientEvents OnRequestStart="onRequestStart" />

 <AjaxSettings>

 <telerik:AjaxSetting AjaxControlID="RadAjaxPanel1">

 </telerik:AjaxSetting>

 <telerik:AjaxSetting AjaxControlID="RadGridHistorico">

 </telerik:AjaxSetting>

 </AjaxSettings>

 </telerik:RadAjaxManager>

 <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" Height="200px" HorizontalAlign="NotSet"

 Width="1195px">

 <telerik:RadGrid ID="RadGridHistorico" runat="server" Skin="Hay" AllowPaging="True"

 AutoGenerateColumns="False" GridLines="None" AllowFilteringByColumn="True" AllowSorting="True"

 ShowGroupPanel="True" ViewStateMode="Enabled" OnPreRender="RadGridHistorico_OnPreRender">

 <ExportSettings ExportOnlyData="true" FileName="Log clientes" HideStructureColumns="true"

 IgnorePaging="true" OpenInNewWindow="true" />

 <ClientSettings AllowDragToGroup="True">

 </ClientSettings>

 <MasterTableView CommandItemDisplay="Top">

 <CommandItemSettings ShowExportToExcelButton="true" />

 <RowIndicatorColumn FilterControlAltText="Filter RowIndicator column">

 </RowIndicatorColumn>

 <ExpandCollapseColumn FilterControlAltText="Filter ExpandColumn column">

 </ExpandCollapseColumn>

 <Columns>

 <telerik:GridBoundColumn AndCurrentFilterFunction="Contains" DataField="NitCliete"

 FilterControlAltText="Filter column column" HeaderText="NitCliete" UniqueName="column">

 </telerik:GridBoundColumn>

 <telerik:GridBoundColumn AndCurrentFilterFunction="Contains" DataField="NombreCliente"

 FilterControlAltText="Filter column1 column" HeaderText="NombreCliente" UniqueName="column1">

 </telerik:GridBoundColumn>

 <telerik:GridBoundColumn AndCurrentFilterFunction="Contains" DataField="ModificadoEliminado"

 FilterControlAltText="Filter column2 column" HeaderText="ModificadoEliminado"

 UniqueName="column2">

 </telerik:GridBoundColumn>

 </Columns>

 <EditFormSettings>

 <EditColumn FilterControlAltText="Filter EditCommandColumn column">

 </EditColumn>

 </EditFormSettings>

 </MasterTableView>

 <ClientSettings AllowColumnsReorder="True" AllowDragToGroup="True" ReorderColumnsOnClient="True">

 </ClientSettings>

 <GroupPanel Text="Arrastre la cabecera de la columna y sueltela sobre esta &#225;rea para agrupar los registros por esa columna.">

 </GroupPanel>

 <FilterMenu EnableImageSprites="False">

 </FilterMenu>

 <HeaderContextMenu CssClass="GridContextMenu GridContextMenu_Hay">

 </HeaderContextMenu>

 </telerik:RadGrid>

 </telerik:RadAjaxPanel>

 </td>

 </td>

 </tr>

  </table>

 <table>

  <tr>

 <td style="width: 100px">

 </td>

 </tr>

 </table>

 </asp:Content>

 

[Maria Ilieva]

Hi Albert,

Note that addin RadAjaxPanel into RadAjaxManager settings or using the both controls for updating the same part of the page is not supported scenario.
Please replace the RadAjaxPanel with regular asp Panel and add a setting in the RadAjaxManager in which the asp Panel updates itself.
Give this a try and let me know if it makes any difference.

Greetings,
Maria Ilieva
the Telerik team

[ALBERT]

hi,

not served, still generates the same errors, this is what you make.  Thanks for your help

 

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

     <ClientEvents OnRequestStart="onRequestStart" />

         <AjaxSettings>

             <telerik:AjaxSetting AjaxControlID="Panel1">

                 <UpdatedControls>

                     <telerik:AjaxUpdatedControl ControlID="Panel1" />

                 </UpdatedControls>

             </telerik:AjaxSetting>

             <telerik:AjaxSetting AjaxControlID="RadGridHistorico">

             </telerik:AjaxSetting>

        </AjaxSettings>

 </telerik:RadAjaxManager>

 

[Maria Ilieva]

Hi Albert,

Could you please try to set  ClientIdMode = AutoID  to the mentioned page and verify if this makes any difference.

Kind regards,
Maria Ilieva
the Telerik team

[ALBERT]

perfect, thank you very much for the answer.