[ASP.Net 2.0, WAP, Atlas]

I have a custom usercontrol that looks something like this:

<%@ Control Language="vb" AutoEventWireup="false" 
Codebehind="ItemPicker.ascx.vb" Inherits="myNS.ItemPicker" %>
<div runat=server id=divMain style="text-align:justify; overflow-x:hidden;">
<div id="divItemList" class="ItemPickerList" runat="server">
 <asp:Repeater ID="rprItems" runat="server">
 <ItemTemplate>
  <div class=ItemPickerItem id='<%#me.uniqueID 
%>_<%#Container.DataItem("ItemID")%>'><%#Container.DataItem("Description")%></div>
 </ItemTemplate>
 </asp:Repeater>
</div>
</div>

In the Page_Load of this control, Me.ClientID = 
"ctl00_ContentPlaceHolder1_ItemPicker1". However, when I look at the page 
that is rendered, there is no element that has 
"ctl00_ContentPlaceHolder1_ItemPicker1" as an ID. There is, of course, 
"ctl00_ContentPlaceHolder1_ItemPicker1_divMain". I kinda thought if a 
control had a client ID it would, uhhh, have that ID on the client. I tried 
wrapping it all in a DIV and setting the DIV ID like so: <div 
id='<%=me.clientID%>', but that was a no-go of course. The only reason I 
care is because in the page that hosts this control I am registering the 
control for AsyncPostBack  (like 
ScriptManager.RegisterAsyncPostBackControl(ItemPicker1)). In the 
__doPostBack event, it is looking for a control with the ID of 
"ctl00_ContentPlaceHolder1_ItemPicker1", but of course can't find it. Any 
suggestions? TIA!

(Bonus question: is there a MS newsgroup for Atlas?)

Hi Monty,

I don't think you can use RegisterAsyncPostBackControl on a UserControl 
instance. A control has ClientID property, doesn't necessary mean the id 
will always be used on the rendered page. For a UserControl, by default it 
only acts as a naming container (implements INamingContainer interface). 
Child controls inside a naming container will use parent's ClientID as 
prefix.

When a control is registered via RegisterAsyncPostBackControl, it must 
occur in the posted form data. Usually a control that will post the form 
can be used with it.

I also noticed you're using me.UniqueID to generate the client id of the 
div; I think you should use ClientID (the difference between UniqueID and 
ClientID is the separator used to compose the result from ID property).


There's no dedicated newsgroup for ASP.NET AJAX now, you can just post in 
asp.net related newsgroups. 


Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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