追蹤車輛

本節說明如何使用 JavaScript 車隊追蹤程式庫，追蹤隨選行程或排定工作中的車輛。

如要追蹤車輛，請按照下列步驟操作：

  1. 載入程式庫並初始化地圖檢視畫面
  2. 提供車輛位置和地圖檢視畫面
  3. 監聽事件並處理錯誤
  4. 停止追蹤

載入程式庫並初始化地圖檢視畫面

如要在網頁的地圖上顯示車隊營運情況，請使用呼叫地圖的指令碼，並提供 API 金鑰。以下範例說明如何從 HTML 執行這項操作：

  • 網址來源：呼叫 Google 地圖 API，使用您的 API 金鑰要求地圖。

  • callback 參數：在 API 傳回呼叫後執行 initMap 函式。

  • libraries 參數：載入車隊追蹤程式庫。

  • defer 屬性：可讓瀏覽器在 API 載入時，繼續算繪網頁的其餘部分。

    <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=journeySharing" defer></script>

提供車輛位置和地圖檢視畫面

如要開始追蹤車輛，請執行車輛位置資訊供應器例項，並使用車輛 ID 初始化地圖檢視畫面，如下列章節所述。

例項化車輛位置資訊供應商

JavaScript 車隊追蹤程式庫包含 Fleet Engine API 的位置資訊供應商。使用專案 ID 和符記擷取器參照，如以下範例所示例項化。

隨選行程

JavaScript

locationProvider =
    new google.maps.journeySharing
        .FleetEngineVehicleLocationProvider({
          projectId,
          authTokenFetcher,

          // Optionally, you may specify
          // vehicleId to immediately start
          // tracking.
          vehicleId: 'your-vehicle-id',
});

TypeScript

locationProvider =
    new google.maps.journeySharing
        .FleetEngineVehicleLocationProvider({
          projectId,
          authTokenFetcher,

          // Optionally, you may specify
          // vehicleId to immediately start
          // tracking.
          vehicleId: 'your-vehicle-id',
});

排定的工作

JavaScript

locationProvider =
    new google.maps.journeySharing
        .FleetEngineDeliveryVehicleLocationProvider({
          projectId,
          authTokenFetcher,

          // Optionally, you may specify
          // deliveryVehicleId to immediately start
          // tracking.
          deliveryVehicleId: 'your-delivery-id',
});

TypeScript

locationProvider =
    new google.maps.journeySharing
        .FleetEngineDeliveryVehicleLocationProvider({
          projectId,
          authTokenFetcher,

          // Optionally, you may specify
          // deliveryVehicleId to immediately start
          // tracking.
          deliveryVehicleId: 'your-delivery-id',
});

初始化地圖檢視畫面

載入 JavaScript 旅程分享程式庫後，請初始化地圖檢視畫面，並將其新增至 HTML 網頁。網頁應包含用於保存地圖檢視區塊的 <div> 元素。在下列範例中，<div> 元素名為 map_canvas。=

隨選行程

JavaScript

const mapView = new
    google.maps.journeySharing.JourneySharingMapView({
  element: document.getElementById('map_canvas'),
  locationProviders: [locationProvider],
});

// If you did not specify a vehicle ID in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.vehicleId
                        = 'your-vehicle-id';

// Give the map an initial viewport to allow it to
// initialize; otherwise the 'ready' event above may
// not fire. The user also has access to the mapView
// object to customize as they want.
mapView.map.setCenter('Times Square, New York, NY');
mapView.map.setZoom(14);

TypeScript

const mapView = new
    google.maps.journeySharing.JourneySharingMapView({
  element: document.getElementById('map_canvas'),
  locationProviders: [locationProvider],
});

// If you did not specify a vehicle ID in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.VehicleId
                        = 'your-vehicle-id';

// Give the map an initial viewport to allow it to
// initialize; otherwise the 'ready' event above may
// not fire. The user also has access to the mapView
// object to customize as they want.
mapView.map.setCenter('Times Square, New York, NY');
mapView.map.setZoom(14);

排定的工作

JavaScript

const mapView = new
    google.maps.journeySharing.JourneySharingMapView({
  element: document.getElementById('map_canvas'),
  locationProviders: [locationProvider],
});

// If you did not specify a delivery vehicle ID in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.deliveryVehicleId
                        = 'your-delivery-vehicle-id';

// Give the map an initial viewport to allow it to
// initialize; otherwise the 'ready' event above may
// not fire. The user also has access to the mapView
// object to customize as they want.
mapView.map.setCenter('Times Square, New York, NY');
mapView.map.setZoom(14);

TypeScript

const mapView = new
    google.maps.journeySharing.JourneySharingMapView({
  element: document.getElementById('map_canvas'),
  locationProviders: [locationProvider],
});

// If you did not specify a delivery vehicle ID in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.deliveryVehicleId
                        = 'your-delivery-vehicle-id';

// Give the map an initial viewport to allow it to
// initialize; otherwise the 'ready' event above may
// not fire. The user also has access to the mapView
// object to customize as they want.
mapView.map.setCenter('Times Square, New York, NY');
mapView.map.setZoom(14);

監聽事件並處理錯誤

開始追蹤車輛後，您會想在地圖上更新車輛的進度，並在車輛沿路線行駛時處理錯誤。

監聽車輛事件

如要追蹤隨選行程或排定工作車輛的進度，請監聽變更事件。

您可以使用位置資訊供應器，從 vehicle 或 deliveryVehicle 物件擷取中繼資料。中繼資訊包括車輛下次接送的預計抵達時間和剩餘距離。元資訊變更時，位置資訊供應商會觸發更新事件。

以下範例說明如何監聽這些變更事件。

隨選行程

JavaScript

locationProvider.addListener('update', e => {
  // e.vehicle contains data that may be
  // useful to the rest of the UI.
  if (e.vehicle) {
    console.log(e.vehicle.vehicleState);
  }
});

TypeScript

locationProvider.addListener('update',
    (e: google.maps.journeySharing.FleetEngineVehicleLocationProviderUpdateEvent) => {
  // e.vehicle contains data that may be
  // useful to the rest of the UI.
  if (e.vehicle) {
    console.log(e.vehicle.vehicleState);
  }
});

排定的工作

JavaScript

locationProvider.addListener('update', e => {
  // e.deliveryVehicle contains data that may be
  // useful to the rest of the UI.
  if (e.deliveryVehicle) {
    console.log(e.deliveryVehicle.remainingDuration);
  }
});

TypeScript

locationProvider.addListener('update',
    (e: google.maps.journeySharing.FleetEngineDeliveryVehicleLocationProviderUpdateEvent) => {
  // e.deliveryVehicle contains data that may be
  // useful to the rest of the UI.
  if (e.deliveryVehicle) {
    console.log(e.deliveryVehicle.remainingDuration);
  }
});

處理錯誤

載入 JavaScript 旅程分享程式庫後，請初始化地圖檢視畫面，並將其新增至 HTML 網頁。網頁應包含用於保存地圖檢視區塊的 <div> 元素。在下列範例中，<div> 元素名為 map_canvas。=

隨選行程

JavaScript

const mapView = new
    google.maps.journeySharing.JourneySharingMapView({
  element: document.getElementById('map_canvas'),
  locationProviders: [locationProvider],
});

// If you did not specify a vehicle ID in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.vehicleId
                        = 'your-vehicle-id';

// Give the map an initial viewport to allow it to
// initialize; otherwise the 'ready' event above may
// not fire. The user also has access to the mapView
// object to customize as they want.
mapView.map.setCenter('Times Square, New York, NY');
mapView.map.setZoom(14);

TypeScript

const mapView = new
    google.maps.journeySharing.JourneySharingMapView({
  element: document.getElementById('map_canvas'),
  locationProviders: [locationProvider],
});

// If you did not specify a vehicle ID in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.VehicleId
                        = 'your-vehicle-id';

// Give the map an initial viewport to allow it to
// initialize; otherwise the 'ready' event above may
// not fire. The user also has access to the mapView
// object to customize as they want.
mapView.map.setCenter('Times Square, New York, NY');
mapView.map.setZoom(14);

排定的工作

JavaScript

const mapView = new
    google.maps.journeySharing.JourneySharingMapView({
  element: document.getElementById('map_canvas'),
  locationProviders: [locationProvider],
});

// If you did not specify a delivery vehicle ID in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.deliveryVehicleId
                        = 'your-delivery-vehicle-id';

// Give the map an initial viewport to allow it to
// initialize; otherwise the 'ready' event above may
// not fire. The user also has access to the mapView
// object to customize as they want.
mapView.map.setCenter('Times Square, New York, NY');
mapView.map.setZoom(14);

TypeScript

const mapView = new
    google.maps.journeySharing.JourneySharingMapView({
  element: document.getElementById('map_canvas'),
  locationProviders: [locationProvider],
});

// If you did not specify a delivery vehicle ID in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.deliveryVehicleId
                        = 'your-delivery-vehicle-id';

// Give the map an initial viewport to allow it to
// initialize; otherwise the 'ready' event above may
// not fire. The user also has access to the mapView
// object to customize as they want.
mapView.map.setCenter('Times Square, New York, NY');
mapView.map.setZoom(14);

停止追蹤車輛

如要停止追蹤車輛，請從位置資訊供應商移除車輛，並從地圖檢視畫面移除位置資訊供應商，詳情請參閱下列章節。以下範例適用於按照需求行程和排定工作實作。

從位置資訊供應商移除車輛

如要停止追蹤車輛，請從位置資訊提供者移除送貨車輛 ID。

隨選行程

JavaScript

locationProvider.vehicleId = '';

TypeScript

locationProvider.vehicleId = '';

排定的工作

JavaScript

locationProvider.deliveryVehicleId = '';

TypeScript

locationProvider.deliveryVehicleId = '';

從地圖檢視畫面中移除位置資訊供應器

以下範例說明如何從地圖檢視畫面中移除位置資訊供應器。

JavaScript

mapView.removeLocationProvider(locationProvider);

TypeScript

mapView.removeLocationProvider(locationProvider);

後續步驟