Simple Google Maps API JavaScript implementation

gistfile1.js

var google_map = {}

window.googleMapInitialize = function() {
	var $map_address = $('#map-address');

	var map_options = {
		zoom: 17,
	};

	google_map = {
		map_element: new google.maps.Map(document.getElementById('map-canvas'), map_options),
		geocoder: new google.maps.Geocoder(),
		marker: new google.maps.Marker(),
		default_location: new google.maps.LatLng(39.57983841844286, -7.9527174624999875)
	}

	google.maps.event.addListener(google_map.marker, 'position_changed', function() {
		var dragged_location = google_map.marker.getPosition();

		fieldValue('map_lat', dragged_location.lat());
		fieldValue('map_lng', dragged_location.lng());
	});

	google.maps.event.addListener(google_map.map_element, 'zoom_changed', function() {
		var new_zoom_value = google_map.map_element.getZoom();

		fieldValue('map_zoom', new_zoom_value);
	});

	if ($map_address.length && $map_address.val()) {
		googleGeocodeAddress($map_address.val());
	} else {
		googleMapSetMarker();
	}

	createMapHiddenInputs();

	fieldValue('map_zoom', map_options.zoom);
}

function createMapHiddenInputs() {
	['map_lat', 'map_lng', 'map_zoom'].forEach(function(current_input) {
		addHiddenInput(current_input, '');
	});
}

function googleMapSetMarker(options) {
	if (googleMapIsNotLoaded()) {
		return;
	}

	function googleMapBounce() {
		if (google_map.marker.getAnimation() != null) {
			google_map.marker.setAnimation(null);
		} else {
			google_map.marker.setAnimation(google.maps.Animation.BOUNCE);
		}
	}

	// clear the marker because we only want one
	if (google_map.marker.getMap()) {
		google_map.marker.setMap(null);
	}

	var default_options = {
		//icon: 'http://i.snag.gy/T9oqh.jpg',
		location: google_map.default_location
	}

	var actual_options = $.extend({}, default_options, options);

	//google_map.marker.setIcon(actual_options.icon);
	google_map.marker.setPosition(actual_options.location);
	google_map.marker.setDraggable(true);
	google_map.map_element.setCenter(actual_options.location);

	google_map.marker.setMap(google_map.map_element);

	// for the lulz
	// googleMapBounce();
}

function googleMapIsNotLoaded() {
	return (google_map.map_element === undefined && google_map.geocoder === undefined && google_map.marker === undefined)
}

function googleMapGetMap() {
	if (googleMapIsNotLoaded()) {
		$.getScript('https://maps.googleapis.com/maps/api/js?v=3.exp&key=LOLOL&sensor=false&callback=googleMapInitialize');
	}

}

function googleGeocodeAddress(address_string) {
	if (!address_string) {
		return;
	}

	if (googleMapIsNotLoaded()) {
		googleMapGetMap();
		toggleSuchMapControls();
		return;
	}

	google_map.geocoder.geocode({
		'address': address_string
	}, function(results, status) {
		if (status == google.maps.GeocoderStatus.OK) {
			googleMapSetMarker({
				location: results[0].geometry.location
			});
		} else {
			console.log("googleGeocodeAddress: unable to retrieve location.");
			googleMapSetMarker();
		}
	});
}

function toggleSuchMapControls() {
	var $map_canvas = $('#map-canvas:visible');

	if ($map_canvas.length) {
		$('.map-togglable').addClass('hidden');
	} else {
		$('.map-togglable').removeClass('hidden');
	}
}

$("#check_address").live('click', function() {
	if (googleMapIsNotLoaded()) {
		googleMapGetMap();
		toggleSuchMapControls();

		return false;
	}

	var $map_address = $('#map-address');
	if ($map_address.length && $map_address.val()) {
		googleGeocodeAddress($map_address.val());

		if ($('#map-canvas:visible').length == 0) {
			toggleSuchMapControls();
		}
	}

	return false;
});