Loading map in rails

gistfile1.txt

<script type="text/javascript">
    function initialize() {
        //var mapOptions = {
        //    zoom: 4,
        //    center: new google.maps.LatLng(-34.397, 150.644)
        //};

        //var map = new google.maps.Map(document.getElementById('geolocation'),
        //        mapOptions);
        var handler = Gmaps.build('Google');
        handler.buildMap({ provider: {zoom: 17}, internal: {id: 'geolocation'}}, function(){
            if(navigator.geolocation)
                navigator.geolocation.getCurrentPosition(displayOnMap);
        });

        function displayOnMap(position){
            var marker = handler.addMarker({
                lat: position.coords.latitude,
                lng: position.coords.longitude
            });
            handler.map.centerOn(marker);
        };
    }

    $(document).ready(function(){
        var script = document.createElement('script');
        script.type = 'text/javascript';
        script.src = 'https://maps.googleapis.com/maps/api/js?v=3.exp' +
        '&key=AIzaSyAbFH5JHChuqLwHNad_ypoJZCqd49kP6Lw&callback=initialize';
        document.body.appendChild(script);
    });
</script>