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");
  }