AJAX ScriptManager in UserControl

Question

I have a UserControl that contains an UpdatePanel which wraps some other controls. The UserControl will be used on some pages that already have a ScriptManager and other pages that do not have a ScriptManager. I'd like the UserControl to automatically bring its own ScriptManager if one does not exist.

I have tried ScriptManager.GetCurrent and if it returns null i create my own ScriptManager and insert it into the Form but I can't find a place early enough in the UserControl's lifecycle to run this code. I keep getting the error "The control with ID 'uPnlContentList' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it." every time i try loading the page. The places i've tried running my code are OnInit, CreateChildControls and PageLoad and they never get called because it dies before reaching them.

Where should I put this check?

Answer 1

I hate to come at this in another direction, but are you using a master page? And if so, have you considered placing a single ScriptManager on it and being done with it?

Answer 2

It will not accept it inside the usercontrol as it should be in the first before any control being rendered so you have to put it inside page itself (parent page) or inside master page if your page inherits a master page. hope it will work insha allah

Answer 3

put a ScriptManager in your MasterPage that all your ASPX files reference. Then anywhere else in the site that you need to work with the ScriptManager use a ScriptManagerProxy that will get the ScriptManager from the master page and let you work with it in the user control and in the code behind.

Now calling ScriptManager.GetCurrent(Page) will give you a reference to a script manager.

<asp:ScriptManagerProxy>
  <Scripts>
    <asp:ScriptReference Path="~/Scripts/myscript.js" />
  <Scripts>
</asp:ScriptManagerProxy>

Here's a link:

MSDN Info

Answer 4

I think the Init event should work. Use the technique you described (i.e. checking that ScriptManager.GetCurrent returns null before adding) but when you add the ScriptManager, make sure you add it as the first control inside the form.

I haven't tested this but I think it will work.

Answer 5

The solution to put it into the MasterPage isn't bulletproof, since some pages might not use the Master Page (for example, I am using a Thickbox script for popups, and the pages loaded in that one doesn't use the Master Page). And the most obvious case - if someone isn't using Master Pages at all...

So a solution where the Web User Control brings it's own Script Manager (if the parent page hasn't any) is appreciated...