Merge pull request #18 from danstowell/jsrouting-durationcalc

[rails.git] / app / assets / javascripts / routing.js.erb

diff --git a/app/assets/javascripts/routing.js.erb b/app/assets/javascripts/routing.js.erb
index af9ce4fbf95dc6f9430919a305354235dd48ce5b..787d31dda7f56bac603afd9af3056bb8dddbe454 100644 (file)
--- a/app/assets/javascripts/routing.js.erb
+++ b/app/assets/javascripts/routing.js.erb
@@ -1,277 +1,309 @@
 /*
 /*

-       osm.org routing interface
-       
-       See also:
-       https://github.com/apmon/openstreetmap-website/tree/routing2
-       https://github.com/apmon/openstreetmap-website/compare/routing2
-       https://github.com/apmon/openstreetmap-website/blob/9755c3ae0a8d0684d43760f91dc864ff42d8477a/app/views/routing/start.js.erb
-
-       *** translation (including all alerts and presentation)
-       *** export GPX
-       *** URL history (or do we consciously not want to support that?)
-       *** add YOURS engine
+    osm.org routing interface

 */
 
 var TURN_INSTRUCTIONS=[]
 
 var ROUTING_POLYLINE={
 */
 
 var TURN_INSTRUCTIONS=[]
 
 var ROUTING_POLYLINE={

-       color: '#03f',
-       opacity: 0.3,
-       weight: 10
+    color: '#03f',
+    opacity: 0.3,
+    weight: 10
+};
+
+var ROUTING_POLYLINE_HIGHLIGHT={
+    color: '#ff0',
+    opacity: 0.5,
+    weight: 12

 };
 
 
 OSM.RoutingEngines={
 };
 
 
 OSM.RoutingEngines={

-       list: []
-       // common functions and constants, e.g. OSRM parser, can go here
+    list: [],
+    add: function(supportsHTTPS,engine) {
+        if (document.location.protocol=="http:" || supportsHTTPS) this.list.push(engine);
+    }

 };
 
 OSM.Routing=function(map,name,jqSearch) {
 };
 
 OSM.Routing=function(map,name,jqSearch) {

-       var r={};
+    var r={};

 
     TURN_INSTRUCTIONS=["",
 
     TURN_INSTRUCTIONS=["",

-       I18n.t('javascripts.directions.instructions.continue_on'),                              // 1
-       I18n.t('javascripts.directions.instructions.slight_right'),             // 2
-       I18n.t('javascripts.directions.instructions.turn_right'),                       // 3
-       I18n.t('javascripts.directions.instructions.sharp_right'),              // 4
-       I18n.t('javascripts.directions.instructions.uturn'),                    // 5
-       I18n.t('javascripts.directions.instructions.sharp_left'),                       // 6
-       I18n.t('javascripts.directions.instructions.turn_left'),                        // 7
-       I18n.t('javascripts.directions.instructions.slight_left'),              // 8
-       I18n.t('javascripts.directions.instructions.via_point'),                                // 9
-       I18n.t('javascripts.directions.instructions.follow'),                                   // 10
-       I18n.t('javascripts.directions.instructions.roundabout'),               // 11
-       I18n.t('javascripts.directions.instructions.leave_roundabout'),         // 12
-       I18n.t('javascripts.directions.instructions.stay_roundabout'),  // 13
-       I18n.t('javascripts.directions.instructions.start'),                    // 14
-       I18n.t('javascripts.directions.instructions.destination'),              // 15
-       I18n.t('javascripts.directions.instructions.against_oneway'),   // 16
-       I18n.t('javascripts.directions.instructions.end_oneway')]               // 17
+    I18n.t('javascripts.directions.instructions.continue_on'),      // 1
+    I18n.t('javascripts.directions.instructions.slight_right'),     // 2
+    I18n.t('javascripts.directions.instructions.turn_right'),       // 3
+    I18n.t('javascripts.directions.instructions.sharp_right'),      // 4
+    I18n.t('javascripts.directions.instructions.uturn'),            // 5
+    I18n.t('javascripts.directions.instructions.sharp_left'),       // 6
+    I18n.t('javascripts.directions.instructions.turn_left'),        // 7
+    I18n.t('javascripts.directions.instructions.slight_left'),      // 8
+    I18n.t('javascripts.directions.instructions.via_point'),        // 9
+    I18n.t('javascripts.directions.instructions.follow'),           // 10
+    I18n.t('javascripts.directions.instructions.roundabout'),       // 11
+    I18n.t('javascripts.directions.instructions.leave_roundabout'), // 12
+    I18n.t('javascripts.directions.instructions.stay_roundabout'),  // 13
+    I18n.t('javascripts.directions.instructions.start'),            // 14
+    I18n.t('javascripts.directions.instructions.destination'),      // 15
+    I18n.t('javascripts.directions.instructions.against_oneway'),   // 16
+    I18n.t('javascripts.directions.instructions.end_oneway')]       // 17

 
 

-       r.map=map;                              // Leaflet map
-       r.name=name;                    // global variable name of this instance (needed for JSONP)
-       r.jqSearch=jqSearch;    // JQuery object for search panel
+    r.map=map;              // Leaflet map
+    r.name=name;            // global variable name of this instance (needed for JSONP)
+    r.jqSearch=jqSearch;    // JQuery object for search panel

 
 

-       r.route_from=null;              // null=unset, false=awaiting response, [lat,lon]=geocoded
-       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.viaPoints=[];                 // not yet used
+    r.route_from=null;      // null=unset, false=awaiting response, [lat,lon]=geocoded
+    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
-       r.popup=null;                   // Leaflet popup object
-       r.marker_from=null;             // Leaflet from marker
-       r.marker_to=null;               // Leaflet to marker
+    r.polyline=null;        // Leaflet polyline object
+    r.popup=null;           // Leaflet popup object
+    r.marker_from=null;     // Leaflet from marker
+    r.marker_to=null;       // Leaflet to marker

 
 

-       r.chosenEngine=null;    // currently selected routing engine
+    r.chosenEngine=null;    // currently selected routing engine

 
 

-       var icon_from = L.icon({
-               iconUrl: <%= asset_path('marker-green.png').to_json %>,
-               iconSize: [25, 41],
-               iconAnchor: [12, 41],
-               popupAnchor: [1, -34],
-               shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
-               shadowSize: [41, 41]
-       });
-       var icon_to = L.icon({
-               iconUrl: <%= asset_path('marker-red.png').to_json %>,
-               iconSize: [25, 41],
-               iconAnchor: [12, 41],
-               popupAnchor: [1, -34],
-               shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
-               shadowSize: [41, 41]
-       });
+    var icon_from = L.icon({
+        iconUrl: <%= asset_path('marker-green.png').to_json %>,
+        iconSize: [25, 41],
+        iconAnchor: [12, 41],
+        popupAnchor: [1, -34],
+        shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
+        shadowSize: [41, 41]
+    });
+    var icon_to = L.icon({
+        iconUrl: <%= asset_path('marker-red.png').to_json %>,
+        iconSize: [25, 41],
+        iconAnchor: [12, 41],
+        popupAnchor: [1, -34],
+        shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
+        shadowSize: [41, 41]
+    });

 
 

-       // Geocoding
+    // Geocoding

 
 

-       r.geocode=function(id,event) { var _this=this;
-               var field=event.target;
-               var v=event.target.value;
-               // *** do something if v==''
-               var querystring = '<%= NOMINATIM_URL %>search?q=' + encodeURIComponent(v) + '&format=json';
-               // *** &accept-language=<%#= request.user_preferred_languages.join(',') %>
-               // *** prefer current viewport
-               r[field.id]=false;
-               $.getJSON(querystring, function(json) { _this._gotGeocode(json,field); });
-       };
-       
-       r._gotGeocode=function(json,field) {
-               if (json.length==0) {
-                       alert("Sorry, couldn't find that place.");      // *** internationalise
-                       r[field.id]=null;
-                       return;
-               }
-               field.value=json[0].display_name;
-               var lat=Number(json[0].lat), lon=Number(json[0].lon);
-               r[field.id]=[lat,lon];
-               r.updateMarker(field.id);
-               if (r.awaitingGeocode) {
-                       r.awaitingGeocode=false;
-                       r.requestRoute(true, true);
-               }
-       };
+    r.geocode=function(id,event) { var _this=this;
+        var field=event.target;
+        var v=event.target.value;
+        var querystring = '<%= NOMINATIM_URL %>search?q=' + encodeURIComponent(v) + '&format=json';
+        // *** &accept-language=<%#= request.user_preferred_languages.join(',') %>
+        r[field.id]=false;
+        $.getJSON(querystring, function(json) { _this._gotGeocode(json,field); });
+    };
+    
+    r._gotGeocode=function(json,field) {
+        if (json.length==0) {
+            alert(I18n.t('javascripts.directions.errors.no_place'));
+            r[field.id]=null;
+            return;
+        }
+        field.value=json[0].display_name;
+        var lat=Number(json[0].lat), lon=Number(json[0].lon);
+        r[field.id]=[lat,lon];
+        r.updateMarker(field.id);
+        if (r.awaitingGeocode) {
+            r.awaitingGeocode=false;
+            r.requestRoute(true, true);
+        }
+    };

 
 

-       // Drag and drop markers
-       
-       r.handleDrop=function(e) {
-               var id=e.originalEvent.dataTransfer.getData('id');
-               var ll=r.map.mouseEventToLatLng(e.originalEvent);
-               // *** ^^^ this is slightly off - we need to work out the latLng of the tip
-               r.createMarker(ll,id);
-               r.setNumericInput(ll,id);
-               r.requestRoute(true, false);
-               // update to/from field
-       };
-       r.createMarker=function(latlng,id) {
-               if (r[id]) r.map.removeLayer(r[id]);
-               r[id]=L.marker(latlng, {
-                       icon: id=='marker_from' ? icon_from : icon_to,
-                       draggable: true,
-                       name: id
-               }).addTo(r.map);
-               r[id].on('drag',r.markerDragged);
-               r[id].on('dragend',r.markerDragged);
-       };
-       // Update marker from geocoded route input
-       r.updateMarker=function(id) {
-               var m=id.replace('route','marker');
-               if (!r[m]) { r.createMarker(r[id],m); return; }
-               var ll=r[m].getLatLng();
-               if (ll.lat!=r[id][0] || ll.lng!=r[id][1]) {
-                       r.createMarker(r[id],m);
-               }
-       };
-       // Marker has been dragged
-       r.markerDragged=function(e) {
-               if (e.type=='drag' && !r.chosenEngine.draggable) return;
-               if (e.type=='drag' && r.awaitingRoute) return;
-               r.setNumericInput(e.target.getLatLng(), e.target.options.name);
-               r.requestRoute(e.type=='dragend', false);
-       };
-       // Set a route input field to a numeric value
-       r.setNumericInput=function(ll,id) {
-               var routeid=id.replace('marker','route');
-               r[routeid]=[ll.lat,ll.lng];
-               $("[name="+routeid+"]:visible").val(Math.round(ll.lat*10000)/10000+" "+Math.round(ll.lng*10000)/10000);
-       }
-       
-       // Route-fetching UI
+    // Drag and drop markers
+    
+    r.handleDrop=function(e) {
+        var oe=e.originalEvent;
+        var id=oe.dataTransfer.getData('id');
+        var pt=L.DomEvent.getMousePosition(oe,map.getContainer());  // co-ordinates of the mouse pointer at present
+        pt.x+=Number(oe.dataTransfer.getData('offsetX'));
+        pt.y+=Number(oe.dataTransfer.getData('offsetY'));
+        var ll=map.containerPointToLatLng(pt);
+        r.createMarker(ll,id);
+        r.setNumericInput(ll,id);
+        r.requestRoute(true, false);
+        // update to/from field
+    };
+    r.createMarker=function(latlng,id) {
+        if (r[id]) r.map.removeLayer(r[id]);
+        r[id]=L.marker(latlng, {
+            icon: id=='marker_from' ? icon_from : icon_to,
+            draggable: true,
+            name: id
+        }).addTo(r.map);
+        r[id].on('drag',r.markerDragged);
+        r[id].on('dragend',r.markerDragged);
+    };
+    // Update marker from geocoded route input
+    r.updateMarker=function(id) {
+        var m=id.replace('route','marker');
+        if (!r[m]) { r.createMarker(r[id],m); return; }
+        var ll=r[m].getLatLng();
+        if (ll.lat!=r[id][0] || ll.lng!=r[id][1]) {
+            r.createMarker(r[id],m);
+        }
+    };
+    // Marker has been dragged
+    r.markerDragged=function(e) {
+        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(!r.dragging, false);
+    };
+    // Set a route input field to a numeric value
+    r.setNumericInput=function(ll,id) {
+        var routeid=id.replace('marker','route');
+        r[routeid]=[ll.lat,ll.lng];
+        $("[name="+routeid+"]:visible").val(Math.round(ll.lat*10000)/10000+" "+Math.round(ll.lng*10000)/10000);
+    }
+    
+    // Route-fetching UI

 
 

-       r.requestRoute=function(isFinal, updateZoom) {
-               if (r.route_from && r.route_to) {
-                       $(".query_wrapper.routing .spinner").show();
-                       r.awaitingRoute=true;
-                       r.chosenEngine.getRoute(isFinal,[r.route_from,r.route_to]);
-                       if(updateZoom){
-                               r.map.fitBounds(L.latLngBounds([r.route_from, r.route_to]).pad(0.05));
-                       }
-                       // then, when the route has been fetched, it'll call the engine's gotRoute function
-               } else if (r.route_from==false || r.route_to==false) {
-                       // we're waiting for a Nominatim response before we can request a route
-                       r.awaitingGeocode=true;
-               }
-       };
+    r.requestRoute=function(isFinal, updateZoom) {
+        if (r.route_from && r.route_to) {
+            $(".query_wrapper.routing .spinner").show();
+            r.awaitingRoute=true;
+            r.chosenEngine.getRoute(isFinal,[r.route_from,r.route_to]);
+            if(updateZoom){
+                r.map.fitBounds(L.latLngBounds([r.route_from, r.route_to]).pad(0.05));
+            }
+            // then, when the route has been fetched, it'll call the engine's gotRoute function
+        } else if (r.route_from==false || r.route_to==false) {
+            // we're waiting for a Nominatim response before we can request a route
+            r.awaitingGeocode=true;
+        }
+    };

 
 

-       // Take an array of Leaflet LatLngs and draw it as a polyline
-       r.setPolyline=function(line) {
-               if (r.polyline) map.removeLayer(r.polyline);
-               r.polyline=L.polyline(line, ROUTING_POLYLINE).addTo(r.map);
-               // r.map.fitBounds(r.polyline.getBounds());
-               // *** ^^^ we only want to do this for geocode-originated routes
-       };
+    // Take an array of Leaflet LatLngs and draw it as a polyline
+    r.setPolyline=function(line) {
+        if (r.polyline) map.removeLayer(r.polyline);
+        r.polyline=L.polyline(line, ROUTING_POLYLINE).addTo(r.map);
+    };

 
 

-       // Take directions and write them out
-       // data = { steps: array of [latlng, sprite number, instruction text, distance in metres] }
-       // sprite numbers equate to OSRM's route_instructions turn values
-       r.setItinerary=function(data) {
-               // Create base table
-               $("#content").removeClass("overlay-sidebar");
-               $('#sidebar_content').empty();
-               var html=('<h2><a class="geolink" href="#" onclick="$(~.close_directions~).click();return false;">' +
-                         '<span class="icon close"></span></a>' + I18n.t('javascripts.directions.directions') + 
-                         '</h2><table id="turnbyturn" />').replace(/~/g,"'");
-               $('#sidebar_content').html(html);
-               // Add each row
-               var cumulative=0;
-               for (var i=0; i<data.steps.length; i++) {
-                       var step=data.steps[i];
-                       // Distance
-                       var dist=step[3];
-                       if (dist<5) { dist=""; }
-                       else if (dist<200) { dist=Math.round(dist/10)*10+"m"; }
-                       else if (dist<1500) { dist=Math.round(dist/100)*100+"m"; }
-                       else if (dist<5000) { dist=Math.round(dist/100)/10+"km"; }
-                       else { dist=Math.round(dist/1000)+"km"; }
-                       // Add to table
-                       var row=$("<tr class='turn'/>");
-                       row.append("<td class='direction i"+step[1]+"'> ");
-                       row.append("<td class='instruction'>"+step[2]);
-                       row.append("<td class='distance'>"+dist);
-                       with ({ num: i, ll: step[0] }) {
-                               row.on('click',function(e) { r.clickTurn(num, ll); });
-                       };
-                       $('#turnbyturn').append(row);
-                       cumulative+=step[3];
-               }
-               $('#sidebar_content').append('<p id="routing_credit">' + r.chosenEngine.creditline + '</p>');
+    // Take directions and write them out
+    // data = { steps: array of [latlng, sprite number, instruction text, distance in metres, highlightPolyline] }
+    // sprite numbers equate to OSRM's route_instructions turn values
+    r.setItinerary=function(data) {
+        // Create base table
+        $("#content").removeClass("overlay-sidebar");
+        $('#sidebar_content').empty();
+        var html=('<h2><a class="geolink" href="#" onclick="$(~.close_directions~).click();return false;">' +
+                  '<span class="icon close"></span></a>' + I18n.t('javascripts.directions.directions') + 
+                  '</h2><p id="routing_summary">' + 
+                  I18n.t('javascripts.directions.distance') + ': ' + r.formatDistance(data.distance)+ '. ' +
+                  I18n.t('javascripts.directions.time'    ) + ': ' + r.formatTime(data.time) + '.</p>' +
+                  '<table id="turnbyturn" />').replace(/~/g,"'");
+        $('#sidebar_content').html(html);
+        // Add each row
+        var cumulative=0;
+        for (var i=0; i<data.steps.length; i++) {
+            var step=data.steps[i];
+            // Distance
+            var dist=step[3];
+            if (dist<5) { dist=""; }
+            else if (dist<200) { dist=Math.round(dist/10)*10+"m"; }
+            else if (dist<1500) { dist=Math.round(dist/100)*100+"m"; }
+            else if (dist<5000) { dist=Math.round(dist/100)/10+"km"; }
+            else { dist=Math.round(dist/1000)+"km"; }
+            // Add to table
+            var row=$("<tr class='turn'/>");
+            row.append("<td class='direction i"+step[1]+"'> ");
+            row.append("<td class='instruction'>"+step[2]);
+            row.append("<td class='distance'>"+dist);
+            with ({ instruction: step[2], ll: step[0], lineseg: step[4] }) {
+                row.on('click',function(e) { r.clickTurn(instruction, ll); });
+                row.hover(function(e){r.highlightSegment(lineseg);}, function(e){r.unhighlightSegment();});
+            };
+            $('#turnbyturn').append(row);
+            cumulative+=step[3];
+        }
+        $('#sidebar_content').append('<p id="routing_credit">' + r.chosenEngine.creditline + '</p>');

 
 

-       };
-       r.clickTurn=function(num,latlng) {
-               r.popup=L.popup().setLatLng(latlng).setContent("<p>"+(num+1)+"</p>").openOn(r.map);
-       };
+    };
+    r.clickTurn=function(instruction,latlng) {
+        r.popup=L.popup().setLatLng(latlng).setContent("<p>"+instruction+"</p>").openOn(r.map);
+    };
+    r.highlightSegment=function(lineseg){
+        if (r.highlighted) map.removeLayer(r.highlighted);
+        r.highlighted=L.polyline(lineseg, ROUTING_POLYLINE_HIGHLIGHT).addTo(r.map);
+    }
+    r.unhighlightSegment=function(){
+        if (r.highlighted) map.removeLayer(r.highlighted);
+    }
+    r.formatDistance=function(m) {
+        if      (m < 1000 ) { return Math.round(m) + "m"; }
+        else if (m < 10000) { return (m/1000.0).toFixed(1) + "km"; }
+        else                { return Math.round(m / 1000)  + "km"; }
+    };
+    r.formatTime=function(s) {
+        var m=Math.round(s/60);
+        var h=Math.floor(m/60);
+        m -= h*60;
+        return h+":"+(m<10 ? '0' : '')+m;
+    };

 
 

-       // Close all routing UI
-       
-       r.close=function() {
-               $("#content").addClass("overlay-sidebar");
-               r.route_from=r.route_to=null;
-               $(".query_wrapper.routing input").val("");
-               var remove=['polyline','popup','marker_from','marker_to'];
-               for (var i=0; i<remove.length; i++) {
-                       if (r[remove[i]]) { map.removeLayer(r[remove[i]]); r[remove[i]]=null; }
-               }
-       };
+    // Close all routing UI
+    
+    r.close=function() {
+        $("#content").addClass("overlay-sidebar");
+        r.route_from=r.route_to=null;
+        $(".query_wrapper.routing input").val("");
+        var remove=['polyline','popup','marker_from','marker_to'];
+        for (var i=0; i<remove.length; i++) {
+            if (r[remove[i]]) { map.removeLayer(r[remove[i]]); r[remove[i]]=null; }
+        }
+    };

 
 

-       // Routing engine handling
+    // Routing engine handling

 
 

-       // Add all engines
-       var list=OSM.RoutingEngines.list;
-       list.sort(function(a,b) { return a.name>b.name; });
-       var select=r.jqSearch.find('select.routing_engines');
-       for (var i=0; i<list.length; i++) {
-               // Set up JSONP callback
-               with ({num: i}) {
-                       list[num].requestJSONP=function(url) {
-                               var script = document.createElement('script');
-                               script.src = url+r.name+".gotRoute"+num;
-                               document.body.appendChild(script); 
-                       };
-                       r['gotRoute'+num]=function(data) { 
-                               r.awaitingRoute=false; list[num].gotRoute(r,data);
-                               $(".query_wrapper.routing .spinner").hide();
-                       };
-               }
-               select.append("<option value='"+i+"'>"+I18n.t(list[i].name)+"</option>");
-       }
-       r.engines=list;
-       r.chosenEngine=list[0]; // default to first engine
+    // Add all engines
+    var list=OSM.RoutingEngines.list;
+    list.sort(function(a,b) { return I18n.t(a.name)>I18n.t(b.name); });
+    var select=r.jqSearch.find('select.routing_engines');
+    for (var i=0; i<list.length; i++) {
+        // Set up JSONP callback
+        with ({num: i}) {
+            list[num].requestJSONP=function(url) {
+                var script = document.createElement('script');
+                script.src = url+r.name+".gotRoute"+num;
+                document.body.appendChild(script); 
+            };
+            list[num].requestCORS=function(url) {
+                $.ajax({ url: url, method: "GET", data: {}, dataType: 'json', success: r['gotRoute'+num] });
+            };
+            r['gotRoute'+num]=function(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>");
+    }
+    r.engines=list;
+    r.chosenEngine=list[0]; // default to first engine

 
 

-       // Choose an engine on dropdown change
-       r.selectEngine=function(e) {
-               r.chosenEngine=r.engines[e.target.selectedIndex];
-               if (r.polyline){ // and if a route is currently showing, must also refresh, else confusion
-                       r.requestRoute(true, false);
-               }
-       };
-       // Choose an engine by name
-       r.chooseEngine=function(name) {
-               for (var i=0; i<r.engines.length; i++) {
-                       if (r.engines[i].name==name) {
-                               r.chosenEngine=r.engines[i];
-                               r.jqSearch.find('select.routing_engines').val(i);
-                       }
-               }
-       };
+    // Choose an engine on dropdown change
+    r.selectEngine=function(e) {
+        r.chosenEngine=r.engines[e.target.selectedIndex];
+        if (r.polyline){ // and if a route is currently showing, must also refresh, else confusion
+            r.requestRoute(true, false);
+        }
+    };
+    // Choose an engine by name
+    r.chooseEngine=function(name) {
+        for (var i=0; i<r.engines.length; i++) {
+            if (r.engines[i].name==name) {
+                r.chosenEngine=r.engines[i];
+                r.jqSearch.find('select.routing_engines').val(i);
+            }
+        }
+    };

 
 

-       return r;
+    return r;

 };
 };