var marker;
function initMap() {
    var styles = [{
            "featureType": "administrative",
            "elementType": "labels.text.fill",
            "stylers": [{
                "color": "#444444"
            }]
        },
        {
            "featureType": "landscape",
            "elementType": "all",
            "stylers": [{
                "color": "#f2f2f2"
            }]
        },
        {
            "featureType": "poi",
            "elementType": "all",
            "stylers": [{
                "visibility": "off"
            }]
        },
        {
            "featureType": "road",
            "elementType": "all",
            "stylers": [{
                    "saturation": -100
                },
                {
                    "lightness": 45
                }
            ]
        },
        {
            "featureType": "road.highway",
            "elementType": "all",
            "stylers": [{
                "visibility": "simplified"
            }]
        },
        {
            "featureType": "road.arterial",
            "elementType": "labels.icon",
            "stylers": [{
                "visibility": "off"
            }]
        },
        {
            "featureType": "transit",
            "elementType": "all",
            "stylers": [{
                "visibility": "off"
            }]
        },
        {
            "featureType": "water",
            "elementType": "all",
            "stylers": [{
                    "color": "#03a9f4"
                },
                {
                    "visibility": "on"
                }
            ]
        }
    ];

    if (latitude == '' || longitude == '') {
        return;
    } else if (isNaN(latitude) || isNaN(longitude)) {
        return;
    }

    latLng = new google.maps.LatLng(latitude, longitude);
    var mapSelector = document.getElementById('map');
    if(mapSelector){
        map = new google.maps.Map(mapSelector, {
            center: { lat: parseFloat(latitude), lng: parseFloat(longitude) },
            zoom: 10,
            styles: styles
        });

        var infowindow = new google.maps.InfoWindow({
            content: mapMarkerTitle
        });

        marker = new google.maps.Marker({
            position: latLng,
            title: mapMarkerTitle,
            visible: true
        });

        marker.addListener('click', function() {
            infowindow.open(map, marker);
        });

        marker.setMap(map);
    }
}
