used for google maps api- rough

gistfile1.js

//Requires 
//jquery and
//<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script> 
(function() {
// Being Closure

var map = false;
geocoder = false;
currentMarker = false;
dragEndListener = false;
clickedNext = false;
intialLocation = false;

// Fields we'll be using
var fields = {
	POSTAL_CODE: "#ActivityPostalCode",
    ADDRESS_EN: "#ActivityLocationEn",
    ADDRESS_FR: "#ActivityLocationFr",
    LAT : "#ActivityLat",
    LON : "#ActivityLon"
}

// A Handy place to store current values of fields
var current_values = {
	address_en: $(fields.ADDRESS_EN).val(),
	address_fr: $(fields.ADDRESS_FR).val(),
	postal_code: $(fields.POSTAL_CODE).val(),
	lat: $(fields.LAT).val(),
	lon: $(fields.LON).val()
}


// Function used to initiate our map
var init = function() {	
	showMap();
}


// Function we use to show the map
var showMap = function(address) {
	var mapOptions = {
		"draggable": true,
	      "mapTypeControl": false,
	      "zoom": 14,
	      "mapTypeId": google.maps.MapTypeId.ROADMAP
	}
	$("#map_canvas").removeClass('util-hide');
    $('#map_instructions').removeClass('util-hide');
	map = map || initalizeMap();
	geocoder = geocoder || new google.maps.Geocoder();
	currentMarker = currentMarker || new google.maps.Marker({"map": map, "draggable":true});
	currentMarker.setVisible(false);
	// http://code.google.com/apis/maps/documentation/javascript/reference.html#MapsEventListener
    if(!dragEndListener) {
        dragEndListener = google.maps.event.addListener(currentMarker, 'dragend', dragEndHandler);        
    }
	var geoOptions = {
		region: 'CA' // we prefer Canadian results
	}
	if(address) {
		geoOptions.address = address;
		map.setZoom(14);
	}
	else if(current_values.lat && current_values.lon) {
		geoOptions.address = current_values.lat+','+current_values.lon;
		currentMarker.setVisible(true);
	}
	else if(current_values.address_en) {
		geoOptions.address = current_values.address_en;
		currentMarker.setVisible(true);
	}
	else if(current_values.address_fr) {
		geoOptions.address = current_values.address_fr;
		currentMarker.setVisible(true);
	}
	else {
		geoOptions.address = 'Canada';
		map.setZoom(3);
	}
	geocoder.geocode(geoOptions,geocodeHandler);
}


var geocodeHandler = function(results,status) {
	switch(status) {
		case(google.maps.GeocoderStatus.OK):
			map.setCenter(results[0].geometry.location);
            currentMarker.setPosition(results[0].geometry.location);
            updateLatLon(results[0].geometry.location);
			$.each(results[0].address_components, function(index,comp) {
                if(comp.types && ('postal_code' == comp.types[0]) && comp.long_name.length > 3) {
                    $(fields.POSTAL_CODE).val(comp.long_name);
                    return false; //stop when we find first
                }
            });
		break;
		case(google.maps.GeocoderStatus.ZERO_RESULTS):
			alert('There were no results for this address information. Please update your information and try again. | Il n\'y a pas de résultats pour ce adresse. S\'il vous plaît mettre à jour vos informations et essayez à nouveau.');
		break;
		default:
			alert('We could not complete your request | Nous ne pouvions pas compléter votre demande');
		break;
	}
}


var initalizeMap = function() {
	var mapOptions = {
      "draggable": true,
      "mapTypeControl": false,
      "zoom": 14,
      "mapTypeId": google.maps.MapTypeId.ROADMAP
    };
	return themap = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
}

// Function to validate a Canadian Postal Code, returns true or false
function isValidPostalCode(postal_code) {
	pattern = /^[A-Z][0-9][A-Z]( )?[0-9][A-Z][0-9]$/i;
	if(pattern.test(postal_code)) {
		return true;
	}else{
		return false;
	}		
}


/**
 * Handle the end of dragging the marker.
 * RIght now, we just cause a new geocode lookup based on the latlng
 * @param Object.latLng
 */
var dragEndHandler = function(o) {
    //updateLatLon(o);
    //Do a reverse geocode lookup based on the new lat lon to fill in the postal code.
    geocoder.geocode({"region": 'CA', "location": o.latLng},geocodeHandler);
};


/**
 * Used to handle updating the Lat and Lon fields of the activity submission form.
 * @param LatLng Object
 */
var updateLatLon = function(LatLng) {
    $(fields.LAT).val(LatLng.lat());
    $(fields.LON).val(LatLng.lng());    
};


var parseAddy = function() {
    var addy = [];
    if('' !=  $(fields.ADDRESS_EN).val()) {
        addy.push($(fields.ADDRESS_EN).val());
    }
    //IF there was no en result, AND there is a french addy value, then...
    if((0 == addy.length) && ('' !=  $(fields.ADDRESS_FR).val())) {
        addy.push($(fields.ADDRESS_FR).val());
    }
    
    if('' != $(fields.POSTAL_CODE).val()) {
        addy.push($(fields.POSTAL_CODE).val());        
    }

    return addy.join(',');
};

$(document).ready(function() {
	$(".next").click(function() {		
		if(!clickedNext) {		
			init();						
			clickedNext = true;
		}
	});
	$(fields.ADDRESS_EN).blur(function() {
		if($(this).val() == current_values.address_en) {
			return false;
		}else{			
			showMap($(this).val());
			currentMarker.setVisible(true);
			current_values.address_en = $(this).val();
		}		
	});
	$(fields.ADDRESS_FR).blur(function() {
		if($(this).val() == current_values.address_fr) {
			return false;
		}else{
			showMap($(this).val());
			currentMarker.setVisible(true);
			current_values.address_fr = $(this).val();
		}		
	});
	$(fields.POSTAL_CODE).blur(function() {
		if($(this).val() == current_values.postal_code) {
			return false;
		}else{
			showMap($(this).val());
			currentMarker.setVisible(true);
			current_values.postal_code = $(this).val();
		}
	});
	
});


// End Closure
})();