Error Uncaught TypeError: Cannot read property 'ajaxRequest' of null

[Support]

Hi, I have an ascx file that contains a RadNotification and a timer.

<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
            <script type="text/javascript">
                function OnClientUpdated(sender, args) {
                    sender.show()
                    $find("<%= RadAjaxManager.GetCurrent(Page).ClientID %>").ajaxRequest("content");
                }
                function UpdateWithoutPopup() {
                    var ajaxManager = $find("<%= RadAjaxManager.GetCurrent(Page).ClientID %>");
                    ajaxManager.ajaxRequest(arguments);
                }
            </script>
</telerik:RadCodeBlock>


<telerik:RadAjaxManagerProxy ID="AjaxManagerProxy1" runat="server">
    <AjaxSettings>
                <telerik:AjaxSetting AjaxControlID="Timer1">
                    <UpdatedControls>
                        <telerik:AjaxUpdatedControl ControlID="RadNotification1" />
                    </UpdatedControls>
                </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManagerProxy>


<asp:Timer ID="Timer1" runat="server" Interval="6000" OnTick="Timer1_Tick" />


 <telerik:RadNotification RenderMode="Lightweight" id="RadNotification1" runat="server" loadcontenton="EveryShow"
        width="300" height="150" animation="Fade" enableroundedcorners="true" enableshadow="true"
        title="Received messages" offsetx="-20" offsety="-20" onclientupdated="OnClientUpdated"
        titleicon="none" autoclosedelay="5000" Skin="Bootstrap">
        <ContentTemplate>
            <asp:Image ID="Image1" runat="server" CssClass="Max75" />
            <asp:Literal ID="lbl" runat="server"></asp:Literal>
        </ContentTemplate>
    </telerik:RadNotification>

the timer makes the checks and if necessary displays a popup, another calls a function

public void Timer1_Tick(object sender, EventArgs e)
{
        if (Check())
        {
            RadNotification1.Show();
        }
        else
        {
            string script = "UpdateWithoutPopup()";
            ScriptManager.RegisterStartupScript(Page, typeof(Page), "myscript", script, true);
        }
    }

When I show the popup everything works fine when if I call the error function I get the error:

default.aspx:502 Uncaught TypeError: Cannot read property 'ajaxRequest' of null

how do I fix?

thanks in advance

[Eyup]

Hello,

The issue is most probably caused by the following line:

ScriptManager.RegisterStartupScript(Page, typeof(Page), "myscript", script, true);

It is not supported to call scripts in the fashion above when using AJAX. You can check the following live sample:
http://demos.telerik.com/aspnet-ajax/ajaxpanel/application-scenarios/recreate-scripts/defaultcs.aspx

Regards,
Eyup
Telerik by Progress