<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?key=YOUR_KEY_GOES_HERE&v=3"></script>

<script src="_content/BlazorGoogleMaps/objectManager.js"></script>

<script src="https://unpkg.com/@@googlemaps/markerclustererplus/dist/index.min.js"></script>

@page "/map"
@using GoogleMapsComponents
@using GoogleMapsComponents.Maps

<h1>Google Map</h1>

<GoogleMap @ref="@map1" Id="map1" Options="@mapOptions"></GoogleMap>

@functions {
	private GoogleMap map1;
	private MapOptions mapOptions;	

	protected override void OnInitialized()
	{
		mapOptions = new MapOptions()
		{
			Zoom = 13,
			Center = new LatLngLiteral()
			{
				Lat = 13.505892,
				Lng = 100.8162
			},
			MapTypeId = MapTypeId.Roadmap
		};
	}		
}

@using GoogleMapsComponents
@using GoogleMapsComponents.Maps

<h1>Google Map</h1>

<GoogleMap @ref="@map1" Id="map1" Options="@mapOptions" Height="350" OnAfterInit="@(async () => await OnAfterInitAsync())"></GoogleMap>
<button @onclick="AddDirections">Add Direction</button>
<p>
    Duration: @_durationTotalString <br />
    Distance: @_distanceTotalString <br />
</p>

@code {
	private GoogleMap map1;
	private MapOptions mapOptions;	
	private DirectionsRenderer dirRend;
	private string _durationTotalString;
    	private string _distanceTotalString;
    
	protected override void OnInitialized()
	{
		mapOptions = new MapOptions()
		{
			Zoom = 13,
			Center = new LatLngLiteral()
			{
                		Lat = 40.603629,
                		Lng = -75.472518
			},
			MapTypeId = MapTypeId.Roadmap
		};
	}

	private async Task OnAfterInitAsync()
    	{
		//Create instance of DirectionRenderer
		dirRend = await DirectionsRenderer.CreateAsync(map1.JsRuntime, new DirectionsRendererOptions()
		{
			Map = map1.InteropObject
		});
	}

	private async Task AddDirections()
    	{
		//Adding a waypoint
		var waypoints = new List<DirectionsWaypoint>();
		waypoints.Add(new DirectionsWaypoint() { Location = "Bethlehem, PA", Stopover = true } );

		//Direction Request
		DirectionsRequest dr = new DirectionsRequest();
		dr.Origin = "Allentown, PA";
		dr.Destination = "Bronx, NY";
		dr.Waypoints = waypoints;
		dr.TravelMode = TravelMode.Driving;
		
		//Calculate Route
		var directionsResult = await dirRend.Route(dr);
		foreach (var route in directionsResult.Routes.SelectMany(x => x.Legs))
		{
		    _durationTotalString += route.Duration.Text;
		    _distanceTotalString += route.Distance.Text;
		}
    	}		
}

In Startup.ConfigureServices
services.AddServerSideBlazor().AddHubOptions(config => config.MaximumReceiveMessageSize = 1048576);