The custom AJAX user control's JavaScript constructor is encountering an "element" that is undefined

I am attempting to develop a customized AJAX user control that includes a client-side object as well. Despite following the guidelines provided in this resource: https://msdn.microsoft.com/en-us/library/bb398906.aspx, I am encountering persistent issues.

The problem arises with "element" consistently being undefined within my constructor. Below is the entirety of my JS file:

Type.registerNamespace("UserControls");

/**
 * The stock window user control class.
 * @param {element} element - The stock window element.
 */
UserControls.StockWindow = function(element)
{
    UserControls.StockWindow.initializeBase(this, [element]);
};

UserControls.StockWindow.registerClass("UserControls.StockWindow", Sys.UI.Control);

Here is a snippet from my ASPX file for reference:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="StockWindow.ascx.cs" Inherits="StockPicker.UserControls.StockWindow"%>
<%@ Register tagprefix="custom" src="~/UserControls/ModalWindow.ascx" tagname="ModalWindow" %>

<div id="<%= ID %>">
    <%-- Initially hide the modal window. --%>
    <div id="ModalWindowContainer" style="display: none;" runat="server">
        <custom:ModalWindow ID="ModalWindowForStock" runat="server" />    
    </div>
</div>

This section contains an excerpt from my ASPX.CS file:

using System;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.Services;

namespace StockPicker.UserControls
{
    /// <summary>
    /// A class dedicated to managing pop-up windows related to stocks.
    /// </summary>
    public partial class StockWindow : UserControl, IScriptControl
    {
       // Additional logic and methods here...
    }
}

Answer №1

Through extensive debugging, I finally discovered that using "ClientID" instead of "ID" was the key to successfully creating the control in the ASPX file. Sharing this insight in the hopes that it will benefit others facing a similar issue!

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