Improve error-handling

app/assets/javascripts/routing.js.erb

@@ -56,6 +56,7 @@ OSM.Routing=function(map,name,jqSearch) {
 	r.route_to=null;		//  |
 	r.awaitingGeocode=false;// true if the user has requested a route, but we're waiting on a geocode result
 	r.awaitingRoute=false;	// true if we've asked the engine for a route and are waiting to hear back
+	r.dragging=false;		// true if the user is dragging a start/end point
 	r.viaPoints=[];			// not yet used
 
 	r.polyline=null;		// Leaflet polyline object
@@ -97,7 +98,7 @@ OSM.Routing=function(map,name,jqSearch) {
 	
 	r._gotGeocode=function(json,field) {
 		if (json.length==0) {
-			alert("Sorry, couldn't find that place."); 	// *** internationalise
+			alert(I18n.t('javascripts.directions.errors.no_place'));
 			r[field.id]=null;
 			return;
 		}
@@ -143,10 +144,11 @@ OSM.Routing=function(map,name,jqSearch) {
 	};
 	// Marker has been dragged
 	r.markerDragged=function(e) {
-		if (e.type=='drag' && !r.chosenEngine.draggable) return;
-		if (e.type=='drag' && r.awaitingRoute) return;
+		r.dragging=(e.type=='drag');	// true for drag, false for dragend
+		if (r.dragging && !r.chosenEngine.draggable) return;
+		if (r.dragging && r.awaitingRoute) return;
 		r.setNumericInput(e.target.getLatLng(), e.target.options.name);
-		r.requestRoute(e.type=='dragend', false);
+		r.requestRoute(!r.dragging, false);
 	};
 	// Set a route input field to a numeric value
 	r.setNumericInput=function(ll,id) {
@@ -247,8 +249,16 @@ OSM.Routing=function(map,name,jqSearch) {
 				document.body.appendChild(script); 
 			};
 			r['gotRoute'+num]=function(data) { 
-				r.awaitingRoute=false; list[num].gotRoute(r,data);
+				r.awaitingRoute=false;
 				$(".query_wrapper.routing .spinner").hide();
+				if (!list[num].gotRoute(r,data)) {
+					// No route found
+					if (r.polyline) {
+						map.removeLayer(r.polyline);
+						r.polyline=null;
+					}
+					if (!r.dragging) { alert(I18n.t('javascripts.directions.errors.no_route')); }
+				}
 			};
 		}
 		select.append("<option value='"+i+"'>"+I18n.t(list[i].name)+"</option>");

app/assets/javascripts/routing_engines/cloudmade_foot.js

@@ -28,6 +28,7 @@ OSM.RoutingEngines.list.push({
 		url+="/foot.js";
         url+="?lang=" + I18n.currentLocale();
 		this.requestJSONP(url+"&callback=");
+		return true;
 	},
 	gotRoute: function(router,data) {
 		router.setPolyline(data.route_geometry);

app/assets/javascripts/routing_engines/graphhopper_bicycle.js

@@ -17,7 +17,6 @@ OSM.RoutingEngines.list.push({
     },
     gotRoute: function(router, data) {
         if (!data.info.routeFound) {
-            alert("Couldn't find route between those two places");
             return false;
         }
         // Draw polyline
@@ -36,6 +35,7 @@ OSM.RoutingEngines.list.push({
             steps.push([{lat: latlng[0], lng: latlng[1]}, instrCode, instrText, distInMeter]);
         }
         router.setItinerary({steps: steps});
+        return true;
     },
     GH_INSTR_MAP: {
         "-3": 6, // sharp left

app/assets/javascripts/routing_engines/mapquest_bicycle.js

@@ -60,5 +60,6 @@ OSM.RoutingEngines.list.push({
 			steps.push([L.latLng(s.startPoint.lat, s.startPoint.lng), d, s.narrative, s.distance*1000]);
 		}
 		router.setItinerary( { steps: steps });
+		return true;
 	}
 });

app/assets/javascripts/routing_engines/osrm_car.js

@@ -19,7 +19,6 @@ OSM.RoutingEngines.list.push({
 	},
 	gotRoute: function(router,data) {
 		if (data.status==207) {
-			alert("Couldn't find route between those two places");
 			return false;
 		}
 		// Draw polyline
@@ -39,5 +38,6 @@ OSM.RoutingEngines.list.push({
 			steps.push([line[s[3]], s[0].split('-')[0], instText, s[2]]);
 		}
 		if (steps.length) router.setItinerary({ steps: steps });
+		return true;
 	}
 });

config/locales/en.yml

@@ -2125,6 +2125,9 @@ en:
         osrm_car: "Car (OSRM)"
         cloudmade_foot: "Foot (Cloudmade)"
       directions: "Directions"
+      errors:
+        no_route: "Couldn't find a route between those two places."
+        no_place: "Sorry - couldn't find that place."
       instructions:
         continue_on: "Continue on "
         slight_right: "Slight right onto "