Encore\Admin\Form\Field\Map::useGoogleMap PHP Method

    public function useGoogleMap()
    {
        $this->script = <<<EOT
        function initGoogleMap(name) {
            var lat = \$('#{$this->id['lat']}');
            var lng = \$('#{$this->id['lng']}');

            var LatLng = new google.maps.LatLng(lat.val(), lng.val());

            var options = {
                zoom: 13,
                center: LatLng,
                panControl: false,
                zoomControl: true,
                scaleControl: true,
                mapTypeId: google.maps.MapTypeId.ROADMAP
            }

            var container = document.getElementById("map_"+name);
            var map = new google.maps.Map(container, options);

            var marker = new google.maps.Marker({
                position: LatLng,
                map: map,
                title: 'Drag Me!',
                draggable: true
            });

            google.maps.event.addListener(marker, 'dragend', function (event) {
                lat.val(event.latLng.lat());
                lng.val(event.latLng.lng());
            });
        }

        initGoogleMap('{$this->id['lat']}{$this->id['lng']}');
EOT;
    }