Upon the initial rendering of the page, the initializeControl function is executed successfully.
Similarly, when a full post-back occurs (e.g., via a submit button), the initializeControl function is triggered and everything functions as intended.
However, during a partial post-back within the UpdatePanel, the initializeControl function remains unexecuted, causing the control to cease functioning.
Here is the HTML structure:
<asp:ScriptManager ID="myScriptManager" runat="server" />
<asp:UpdatePanel ID="myUpdatePanel" runat="server">
<ContentTemplate>
<uc:MyControl ID="myControl" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
User Control Code:
Protected Overrides Sub Render(ByVal writer As HtmlTextWriter)
Dim initializeScript = String.Format("initializeControl('{0}');", ClientID)
Page.ClientScript.RegisterStartupScript(GetType(Page),
New Guid().ToString(), initializeScript, True)
MyBase.Render(writer)
End Sub
For testing purposes, assume that the initializeControl function simply contains a debugger; statement (the actual content of the function operates correctly - it's just not being called when required).
It should be noted that the user control lacks knowledge regarding whether it is situated within an UpdatePanel or not, and does not have access to the parent page's ScriptManager element through server-side code.
Thank you in advance for any assistance provided.
P.S. While recognizing the drawbacks of UpdatePanels and the recommendation to avoid them, the current project involves numerous consuming pages already utilizing them, making it impossible to make immediate changes.