Demo of loading Google Maps, fetching Markers with AJAX, Geocoding new location and POSTing new location with AJAX. http://dwd-nodejs-remoteapis.herokuapp.com/

index.html

<style>
	/* IMPORTANT - must give map div height */
	#map-canvas { 
		height:400px;
	}

	/* IMPORTANT - fixes webkit infoWindow rendering */
	#map-canvas img {
		max-width: none;
	}
</style>

<div class="row">
	<div class="span12">
		<h1>{{pageTitle}}</h1>
	</div>
</div>

<div class="row">

	<div class="span6">
		<div id="map-canvas"></div>
		<br>
		<p>
			<a href="/data/places" target="_blank">View Places JSON</a>
		</p>

	</div>
	
	<!-- right column -->
	<div class="span6">

		<form class="form-horizontal">
			<fieldset>

			<!-- Form Name -->
			<legend>Add Your Place</legend>

			<!-- Text input-->
			<div class="control-group">
			  <label class="control-label">Your name</label>
			  <div class="controls">
			    <input id="place_name" name="name" type="text" placeholder="" class="input-xlarge" required="">
			    
			  </div>
			</div>

			<!-- Text input-->
			<div class="control-group">
			  <label class="control-label">Location</label>
			  <div class="controls">
			    <input id="location" name="location" type="text" placeholder="Enter a city, state or zipcode" class="input-xlarge" required="">
			    <p class="help-block">This field will be geocoded with Google Maps API</p>
			  </div>
			</div>

			<!-- Button -->
			<div class="control-group">
			  <label class="control-label"></label>
			  <div class="controls">
			    <input type="submit" id="locationBtn" name="locationBtn" class="btn btn-primary" value="Add Location">
			  </div>
			</div>

			</fieldset>
		</form>


	</div>

</div>

<div class="row">
	<div class="offset1 span10">
		
		<hr>

		<h2>Here's the source...</h2>
		<!-- display code sample Github Gist -->
		<script src="https://gist.github.com/johnschimmel/5319511.js"></script>
	</div>
</div>

<!-- START OF THE GOOD STUFF -->

<!-- Load the Google Maps JS API. Your Google maps key will be rendered. -->
<script type="text/javascript"
  src="//maps.googleapis.com/maps/api/js?sensor=false&key={{google_maps_key}}">
</script>
<script type="text/javascript">
  var geocoder;
  var map;
  var places;
  var markers = [];

  function initialize() {

  	// create the geocoder
  	geocoder = new google.maps.Geocoder();
    
    // set some default map details, initial center point, zoom and style
    var mapOptions = {
      center: new google.maps.LatLng(40.74649,-74.0094),
      zoom: 7,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    
    // create the map and reference the div#map-canvas container
    map = new google.maps.Map(document.getElementById("map-canvas"), mapOptions);

    // fetch the existing places (ajax) 
    // and put them on the map
    fetchPlaces();
  }

  // when page is ready, initialize the map!
  google.maps.event.addDomListener(window, 'load', initialize);


  // add location button event
  jQuery("form").submit(function(e){

  	// the name form field value
  	var name = jQuery("#place_name").val();
  	
  	// get the location text field value
  	var loc = jQuery("#location").val();
  	console.log("user entered location = " + loc);

  	geocoder.geocode( { 'address': loc }, function(results, status) {
      if (status == google.maps.GeocoderStatus.OK) {

      	// log out results from geocoding
      	console.log("geocoding results");
        console.log(results);
        
        // reposition map to the first returned location
        map.setCenter(results[0].geometry.location);
        
        // put marker on map
        var marker = new google.maps.Marker({
            map: map,
            position: results[0].geometry.location
        });

        bindInfoWindow(marker, map, infowindow, places[p].name + "<br>" + places[p].geo_name);

		// not currently used but good to keep track of markers
		markers.push(marker);
        
        // preparing data for form posting
        var lat = results[0].geometry.location.lat();
        var lng = results[0].geometry.location.lng();
        var loc_name = results[0].formatted_address;

        // send first location from results to server as new location
        jQuery.ajax({
        	url : '/add_place',
        	dataType : 'json',
        	type : 'POST',
        	data : {
        		name : name,
        		latlng : lat + "," + lng,
        		geo_name : loc_name
        	},
        	success : function(response){
        		// success - for now just log it
        		console.log(response);

        	},
        	error : function(err){

        		// do error checking
        		alert("something went wrong");
        		console.error(err);
        	}
        });


      } else {
        alert("Try again. Geocode was not successful for the following reason: " + status);
      }
  	});
	

    e.preventDefault();
    return false;

  });


	// fetch Places JSON from /data/places
	// loop through and populate the map with markers
	var fetchPlaces = function() {

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

		jQuery.ajax({
			url : '/data/places',
			dataType : 'json',
			success : function(response) {
				
				if (response.status == 'OK') {

					places = response.places;

					// loop through places and add markers
					for (p in places) {

						//create gmap latlng obj
						tmpLatLng = new google.maps.LatLng( places[p].geo[0], places[p].geo[1]);

						// make and place map maker.
						var marker = new google.maps.Marker({
						    map: map,
						    position: tmpLatLng,
						    title : places[p].name + "<br>" + places[p].geo_name
						});

						bindInfoWindow(marker, map, infowindow, '<b>'+places[p].name + "</b><br>" + places[p].geo_name);

						// not currently used but good to keep track of markers
						markers.push(marker);

					}

				}
			}
		})


	};

	// binds a map marker and infoWindow together on click
	var bindInfoWindow = function(marker, map, infowindow, html) {
	    google.maps.event.addListener(marker, 'click', function() {
	        infowindow.setContent(html);
	        infowindow.open(map, marker);
	    });
	} 

  
</script>

Is the heroku app supposed to be still running?

Thanks brow!