追蹤車輛

本節說明如何使用 JavaScript 機群追蹤程式庫追蹤 提供隨選行程或已排定工作的交通工具。

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
  3. 監聽事件及處理錯誤
  4. 停止追蹤

載入程式庫並初始化地圖檢視

如要在網頁的地圖上顯示機群作業，請使用 使用 API 金鑰呼叫地圖的指令碼。以下範例說明 方法是在 HTML 中操作：

  • 網址來源：呼叫 Google Maps API，以使用您的 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：載入機群追蹤程式庫。

  • defer 屬性：可讓瀏覽器繼續轉譯其餘內容的 頁面。

    <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，雙方都必須將車輛定位服務供應商例項化 並使用車輛 ID 初始化地圖檢視，如下所述 專區。

將車輛定位服務供應商例項化

JavaScript 機群追蹤程式庫內含機群的位置提供者 Compute Engine API請使用專案 ID 和權杖擷取工具的參照 將其例項化，如以下範例所示。

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',
});

已排定的工作

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

載入 JavaScript 歷程共用資料庫後，請初始化 地圖檢視並加進 HTML 網頁。網頁應包含 包含地圖檢視的 &lt;div&gt; 元素。&lt;div&gt; 元素 名稱為 map_canvas，如以下範例所示。=

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);

已排定的工作

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，你想在地圖上更新車輛進度 並在車輛沿著路線行駛時處理錯誤。

監聽車輛事件

如要追蹤隨選行程或已排定工作的車輛進度， 您需要監聽變更事件

您可以從 vehicle 或 deliveryVehicle 物件使用 位置預測供應商中繼資訊包括預計到達時間和剩餘距離 。中繼資訊變更 在位置提供者中觸發 update 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);
  }
});

已排定的工作

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 歷程共用資料庫後，請初始化 地圖檢視並加進 HTML 網頁。網頁應包含 包含地圖檢視的 &lt;div&gt; 元素。&lt;div&gt; 元素 名稱為 map_canvas，如以下範例所示。=

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);

已排定的工作

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，你必須從定位服務供應商中移除車輛，並 依照下列說明從地圖檢視中移除位置提供者 專區。這裡的例子適用於隨選行程和排定的工作 。

從地點提供者中移除車輛

如要讓地點供應商停止追蹤車輛，請移除 營業地點供應商提供的交車 ID。

隨選行程

JavaScript

locationProvider.vehicleId = '';

TypeScript

locationProvider.vehicleId = '';

已排定的工作

JavaScript

locationProvider.deliveryVehicleId = '';

TypeScript

locationProvider.deliveryVehicleId = '';

從地圖檢視中移除這個位置提供者

下例說明如何從地圖檢視中移除地點提供者。

JavaScript

mapView.removeLocationProvider(locationProvider);

TypeScript

mapView.removeLocationProvider(locationProvider);

後續步驟