Google Maps infoWindow without marker?

Question

According to the documention a marker is optional with an infoWindow, so how is this achieved please? I have tried infowindow.open(map) and infowindow.open(map,

Answer 1

Since the api has changed, it is not possible to set position on info window any more. the solution i found is to add a marker to the map with visibility false:

this.map.addMarker({
        position: {
          'lat': sites[0].latitude,
          'lng': sites[0].longitude
        },
        // setting visible false since the icon will be the poi icon
        visible: false
      }).then((marker: Marker) => {

        this.htmInfoWindow.open(marker);
      });