]> git.openstreetmap.org Git - rails.git/blobdiff - app/assets/javascripts/routing.js.erb
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[rails.git] / app / assets / javascripts / routing.js.erb
index d1c66e2939b6d86d98983fc584e54f1f018e2f54..fc2bb8d30e4f02adc6441f254647e3c10fc9984b 100644 (file)
 /*
 /*
-       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 TURN_INSTRUCTIONS = [];
 
 
-var ROUTING_POLYLINE={
-       color: '#03f',
-       opacity: 0.3,
-       weight: 10
+var ROUTING_POLYLINE = {
+  color: '#03f',
+  opacity: 0.3,
+  weight: 10
 };
 
 };
 
+var ROUTING_POLYLINE_HIGHLIGHT = {
+  color: '#ff0',
+  opacity: 0.5,
+  weight: 12
+};
 
 
-OSM.RoutingEngines={
-       list: []
-       // common functions and constants, e.g. OSRM parser, can go here
+OSM.RoutingEngines = {
+  list: [],
+  add: function (supportsHTTPS, engine) {
+    if (document.location.protocol == "http:" || supportsHTTPS) this.list.push(engine);
+  }
 };
 
 };
 
-OSM.Routing=function(map,name,jqSearch) {
-       var r={};
-
-    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
-
-       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.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.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]
-       });
-
-       // 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(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) {
-               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;
-               }
-       };
-
-       // 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 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>');
-
-       };
-       r.clickTurn=function(num,latlng) {
-               r.popup=L.popup().setLatLng(latlng).setContent("<p>"+(num+1)+"</p>").openOn(r.map);
-       };
-
-       // 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
-
-       // 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;
-                               $(".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);
-                       }
-               }
-       };
-
-       return r;
+OSM.Routing = function (map, name, jqSearch) {
+  var r = {};
+
+  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
+  ];
+
+  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.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.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]
+  });
+
+  // Geocoding
+
+  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 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;
+    }
+  };
+
+  // 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, 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">' + I18n.t('javascripts.directions.instructions.courtesy', {link: r.chosenEngine.creditline}) + '</p>');
+  };
+
+  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;
+      }
+    }
+  };
+
+  // Routing engine handling
+
+  // 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);
+      }
+    }
+  };
+
+  return r;
 };
 };