<script src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=3.2compact"></script>
<script src="../quickstart-js/src/esriquickstart.js"></script>

<script type="text/javascript">
  var map;
  function init() {
      map = new esri.Map("map");
      map.setBasemap(esri.arcgisonline.basemaps.STREETS);
      map.centerAtLatLon(45.512, -122.643, 8);
  }
</script>

    var searchOptions = { 
      place: "Cafe",  // e.g. Redlands, 380 New York St, Starbucks...
            placeType: "Coffee Shop",  // e.g. Coffee Shop, Gas Station, Shopping...
            searchExtent: map.extend  // if null, it will search the global database
        };
        
    geocodeService.findPlaces(searchOptions, geocodeResults, geocodeErrorHandler);

    function geocodeResults(places) {
        if (places.length > 0) {
            for (var i = 0; i < places.length; i++) {
                var place = places[i];
                var lat = place.point.getLatitude(5);
                var lon = place.point.getLongitude(5);
                map.graphics.addPoint(place.point, { 
                  title: "<b>Geocode Result</b>",
                    content: place.address + "<br/>Lat/Lon: " + lat + "," + lon,
                    symbol: map.defaultSymbols.Geolocation,
                    attributes: { "ID": "PlacesGraphicID"}
                });
            }
    
            zoomToPlaces(places);
    
        } else {
            alert("Sorry, address or place not found.");
        }
    }        

    function geocodeErrorHandler(errorInfo) {
        alert("Sorry, address not found!");
    }        

Sample Request:

http://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer/reverseGeocode?location=13.421,+52.487&outSR=4326&f=json

Sample Response:

      if(navigator.geolocation) {
      navigator.geolocation.getCurrentPosition(function(position){
        var zoom = 13;
        var pt = new esri.geometry.Point(position.coords.longitude, 
          position.coords.latitude);

        var options = {
          title: "<b>Current Location</b>",
                  content: "Latitude: " + pt.getLatitude(3) 
                    + "</br>Longitude: " + pt.getLongitude(3),
                  symbol: map.defaultSymbols.Geolocation
                };
                          
        map.graphics.addPoint(pt, options);     
        map.centerAtPoint(pt, zoom);
      });
    }

    navigator.geolocation.watchPosition(function(position){
      var pt = new esri.geometry.Point(position.coords.longitude, 
        position.coords.latitude);

      var options = {
        title: "Current Location",
              content: "Latitude: " + pt.getLatitude(3) 
                + "</br>Longitude: " + pt.getLongitude(3),
              symbol: map.defaultSymbols.Geolocation
            };
                      
      map.graphics.addPoint(pt, options);     
      map.centerAtPoint(pt, 15);
    });

[locationManager startMonitoringSignificantLocationChanges];

locationManager.requestLocationUpdate(
  LocationManager.PASSIVE_PROVIDER, 0, 0, listener);

POST /trigger/create

{
  "app_id": "XXXXX",
  "app_secret": "XXXXX",
  "condition": {
    "direction": "enter",
    "geo": {
      "point": {
        "latitude": 52.5107,
        "longitude": 13.3757,
        "distance": 500
      }
    }
  },
  "action": {
    "message": "About 500 meters from the hotel."
  }
}

POST /trigger/create

{
  "app_id": "XXXXX",
  "app_secret": "XXXXX",
  "condition": {
    "direction": "enter",
    "geo": {
      "point": {
        "geocode": "Axel-Springer-Straße 55, Berlin",
        "drive_time": 600
      }
    }
  },
  "action": {
    "message": "About 5 minutes away from the hotel."
  }
}