setupRoutingAPI(map) {
        ghRouting.clearPoints();

        if (typeof routingLayer.clearLayers !== "undefined") {
          console.log('wyjebie blad')
        }

        ghRouting.addPoint(new GHInput(this.from.point.lat, this.from.point.lng));

        if (Object.keys(this.via1).length > 0) ghRouting.addPoint(new GHInput(this.via1.point.lat, this.via1.point.lng));
        if (Object.keys(this.via2).length > 0) ghRouting.addPoint(new GHInput(this.via2.point.lat, this.via2.point.lng));
        if (Object.keys(this.via3).length > 0) ghRouting.addPoint(new GHInput(this.via3.point.lat, this.via3.point.lng));
        if (Object.keys(this.via4).length > 0) ghRouting.addPoint(new GHInput(this.via4.point.lat, this.via4.point.lng));

        ghRouting.addPoint(new GHInput(this.destination.point.lat, this.destination.point.lng));

        ghRouting.doRequest()
          .then(function (json) {
            var path = json.paths[0];
            routingLayer.clearLayers();

            routingLayer.addData({
              "type": "Feature",
              "geometry": path.points
            });
            var outHtml = "Distance in meter: " + path.distance;
            $("#routing-response").html(outHtml);

            // center the map after drawing route
            if (path.bbox) {
              var minLon = path.bbox[0];
              var minLat = path.bbox[1];
              var maxLon = path.bbox[2];
              var maxLat = path.bbox[3];
              var tmpB = new L.LatLngBounds(new L.LatLng(minLat, minLon), new L.LatLng(maxLat, maxLon));
              map.fitBounds(tmpB);
            }
          })
          .catch(function (err) {
            var str = "An error occured: " + err.message;
            $("#routing-response").text(str);
          });
        // end of API call using JS library

        var routingLayer = L.geoJson().addTo(this.routingMap);
        routingLayer.clearLayers();

        routingLayer.options = {
          style: { color: "#00cc33", "weight": 5, "opacity": 0.6 }
        };
      },