In VB.NET javascript issue in geckowebbrowser

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Initially Iam using Webbrowser in vb.net for googlemap. now google not supporting the Webbrowser.So Iam using geckoWebbrowser.

map is displaying in browser but my issue is when i click map the geolocation to pass to vb.net form function .but iam unable to call vb.net form function in javascript side.
initially we r using window.host in webbrowser.
please give me solution for that.

What I have tried:

javascript code
--------------------

function Initialize()
            {  
				var stZoom=10;
                var MapType=google.maps.MapTypeId.ROADMAP;
                var myLatlng = new google.maps.LatLng("13.12","76.12"); 
                var myOptions = {zoom: parseInt(stZoom),center: myLatlng,mapTypeId: MapType};
				map = new google.maps.Map(document.getElementById("map_canvasADD"), myOptions);  
				currentMarker = new google.maps.Marker({map: map,draggable: false,position: {lat: "13.12", lng: "76.12"},index:0});  
				currentMarker.setPosition(myLatlng);
                google.maps.event.addListener(map, 'click', MapGeo);
            }

function MapGeo(e){
                   
                    window.external.MapGeoDotnet(e.latLng.lat(),e.latLng.lng());
	
			}

----- End JavaScript----

-----vb.net Side -----

Public Sub MapGeoDotnet(ByVal lat As Double, ByVal lng As Double)
      Msgbox(lat & " " & lng)

  End Sub

Posted 9-Dec-22 1:02am

Member 11641401

Updated 13-Dec-22 23:24pm

CHill60

v2

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Richard Deeming · Answer 1 · 2022-12-13T23:24:00

Looks like you need to use a message event to trigger your VB.NET code from Javascript:
https://stackoverflow.com/questions/15710581/how-to-call-c-sharp-method-in-javascript-by-using-geckofx-as-the-wrapper-of-xulr[^]
Window.postMessage() - Web APIs | MDN[^]

JavaScript

function MapGeo(e){
    const event = new MessageEvent("MapGeo", { 
        view: window, 
        bubbles: true, 
        cancelable: false, 
        data: JSON.stringify({ lat: e.latLng.lat(), lng: e.latLng.lng() })
    });
    
    document.dispatchEvent(event);
}

VB.NET

browser.AddMessageEventListener("MapGeo", data => 
{
    Dim o As JObject = JObject.Parse(data)
    Dim lat As Double = CDbl(o.SelectToken("lat"))
    Dim lng As Double = CDbl(o.SelectToken("lng"))
    MapGeoDotnet(lat, lng)
});