RadAjaxManagerProxy: 'id' of undefined

[CARLOS]

I am probably missing something simple. I have a master page with the RadAjaxManager, I created a brand new content page and added the RadAjaxManagerProxy. I added a button and a label. When I click the button, I put the current date on the label. Simple

<telerik:RadAjaxManagerProxy ID="RadAjaxManagerProxy1" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="Button_ClearFilters">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="Label_Today" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManagerProxy>

<asp:Button ID="Button_ClearFilters" runat="server" Text="Clear filters" OnClick="Button_ClearFilters_Click"></asp:Button>
<asp:Label ID="Label_Today" runat="server" Text="Today" />

Yet for some reason, I am getting an error: 
Uncaught TypeError: Cannot read property 'id' of undefined
I would appreciate the help.

[CARLOS]

I found something odd. I made a brand new master page with RadAjaxManager and a content page with RadAjaxProxyManager1. I added the label and an asp.net button and a radbutton. Both should stamp the current date on the label. The radbutton worked. The asp button did not. Maybe someone at telerik can't tell me if this is expected. Thanks.

<telerik:RadAjaxManagerProxy ID="RadAjaxManagerProxy1" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="Button1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="Label_Today" />
            </UpdatedControls>
        </telerik:AjaxSetting>
        <telerik:AjaxSetting AjaxControlID="RadButton1">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="Label_Today" />
            </UpdatedControls>
        </telerik:AjaxSetting>
    </AjaxSettings>
</telerik:RadAjaxManagerProxy>

<telerik:RadButton ID="RadButton1" runat="server" Text="RadButton Test" OnClick="RadButton1_Click">
</telerik:RadButton>
<asp:Button ID="Button1" runat="server" Text="Button Test" OnClick="Button1_Click" >
</asp:Button>

<asp:Panel ID="Panel_Today" runat="server">
    <asp:Label ID="Label_Today" runat="server" Text="Today" />
</asp:Panel>

[msigman]

This sounds as though there is some JavaScript that is attempting to find an element which does not exist on the page after PostBack.  Do you have some custom JavaScript somewhere on your pages?

Cannot read property 'id' of undefined

[CARLOS]

No msigman. I actually created a new master page and a new content page. No javascript was added.

[Eyup]

Hi Carlos,

I have prepared a sample RadGrid web site to test the described behavior. Can you please run the attached application and instruct me the exact steps to reproduce the issue?

Regards,
Eyup
Telerik