Google maps marker.AdvancedMarkerElement is Undefined Error

Question

I am trying to load this example into a C# ASP.Net server. I am getting an error message: Google maps marker.AdvancedMarkerElement is undefined

Reference Code:

1. Report.cshtml
   Note: Insert your API key

@*
    For more information on enabling MVC for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
*@
@{
}
<div id="map"></div>
@section Scripts{
    <script>
        function initMap() {
            const position = { lat: -25.344, lng: 131.031 };

            const map = new google.maps.Map(document.getElementById("map"), {
                zoom: 4,
                center: position,
                mapId: "DEMO_MAP_ID", // Map ID is required for advanced markers.
            });

            // The advanced marker, positioned at Uluru
            const marker = new google.maps.marker.AdvancedMarkerElement({
                map,
                position: position,
                title: 'Uluru',
            });
        };
        $(document).ready(function () {
            window.initMap = initMap;
        });
        
    </script>
    <script src="https://maps.googleapis.com/maps/api/js?key=xxxxxx&callback=initMap&v=weekly&loading=async"
            defer>
    </script>
}

2. Controller

using FastTestMap.Models;
using Microsoft.AspNetCore.Mvc;
using System.Diagnostics;

namespace FastTestMap.Controllers
{
    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;

        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }

        public IActionResult Index()
        {
            return View();
        }

        public IActionResult Privacy()
        {
            return View();
        }
        public IActionResult Report()
        {
            return View();
        }

        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }
}

I am trying to run the above example using the example provided on Google Advance Marker Element and I think the problem is with the way the library is getting loaded. I believe that the library is deferring its load, therefore the advance marker is undefined.

I tried the stackoverflow solution in comments to no end.

Answer 1

You need to add marker library

https://developers.google.com/maps/documentation/javascript/libraries