navigation.js Example File

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 function requestNavigationRoute(rModel) {
     var xhr = new XMLHttpRequest;
     xhr.open("GET", "walk_route.json");
     xhr.onreadystatechange = function () {
         if (xhr.readyState === XMLHttpRequest.DONE) {
             var a = JSON.parse(xhr.responseText);
             var steps = a.routes[0].legs[0].steps;

             for (var step in steps) {
                 var maneuver = steps[step].maneuver;
                 var duration = steps[step].duration;
                 var distance = steps[step].distance;

                 rModel.append({
                                       navInstruction: maneuver.instruction,
                                       navImage: getNavigationImage(
                                                     maneuver.type,
                                                     maneuver.modifier,
                                                     routeView.imageList),
                                       navAuxInfo: getAuxInfo(distance,
                                                              duration)
                                   });
             }
         }
     }
     xhr.send();
 }

 function getNavigationImage(maneuverType, maneuverModifier, imageList) {
     var imageToReturn;
     if (maneuverType === "depart") {
         imageToReturn = imageList[4];
     } else if (maneuverType === "arrive") {
         imageToReturn = imageList[5];
     } else if (maneuverType === "turn") {
         if (maneuverModifier.search("left") >= 0)
             imageToReturn = imageList[1];
         else if (maneuverModifier.search("right") >= 0)
             imageToReturn = imageList[2];
         else
             imageToReturn = imageList[0];
     } else {
         if (maneuverModifier === "uturn") {
             imageToReturn = imageList[3];
         } else {
             imageToReturn = imageList[0];
         }
     }

     return imageToReturn;
 }

 function getAuxInfo(distInMeters, timeInSecs) {
     var distance = convertDistance(distInMeters);
     if (distance.length > 0)
         return "Distance: " + distance + "\nTime: " + formatSeconds(
                     timeInSecs);
     else
         return "";
 }

 function convertDistance(meter) {
     var dist = "";
     var feet = (meter * 0.3048).toPrecision(6);
     var miles = (meter * 0.000621371).toPrecision(6);

     if (Math.floor(miles) > 1) {
         dist += Math.floor(miles) + " mi";
         feet = ((miles - Math.floor(miles)) * 0.3048).toPrecision(6);
     }
     if (Math.floor(feet) > 1)
         dist += Math.floor(feet) + " ft";

     return dist
 }

 function formatSeconds(seconds) {
     var date = new Date(1970, 0, 1);
     date.setSeconds(seconds);
     return date.toTimeString().replace(/.*(\d{2}:\d{2}:\d{2}).*/, "$1");
 }