Bagian ini menunjukkan cara menggunakan library pelacakan armada JavaScript untuk melihat armada. Prosedur ini mengasumsikan bahwa Anda telah menyiapkan library pelacakan fleet dan memuat peta. Untuk mengetahui detailnya, lihat Menyiapkan library pelacakan armada JavaScript.
Dokumen ini membahas hal-hal berikut yang dapat Anda lakukan saat melihat armada:
- Mulai melacak armada.
- Memproses peristiwa dan menangani error.
- Berhenti melacak.
- Melacak satu kendaraan saat melihat armada.
Mulai melacak armada
Untuk melacak armada, Anda perlu membuat instance penyedia lokasi armada dan menetapkan batasan lokasi untuk area tampilan peta seperti yang dijelaskan di bagian berikut.
Membuat instance penyedia lokasi armada
Library pelacakan armada JavaScript menyertakan penyedia lokasi yang mengambil beberapa kendaraan dari Fleet Engine.
Untuk membuat instance-nya, ikuti langkah-langkah berikut:
Gunakan project ID Anda serta referensi ke pengambil token Anda.
Menggunakan kueri filter kendaraan Kueri filter kendaraan mengontrol kendaraan yang ditampilkan peta. Filter diteruskan ke Fleet Engine.
- Untuk layanan on demand, gunakan
vehicleFilter
, dan tinjauListVehiclesRequest.filter
- Untuk tugas terjadwal, gunakan
deliveryVehicleFilter
, dan tinjauListDeliveryVehiclesRequest.filter
- Untuk layanan on demand, gunakan
Tetapkan area pembatas untuk tampilan kendaraan. Gunakan
locationRestriction
untuk membatasi area tempat kendaraan ditampilkan di peta. Penyedia lokasi tidak akan aktif hingga parameter ini disetel. Anda dapat menetapkan batas lokasi di konstruktor, atau setelah konstruktor.Lakukan inisialisasi tampilan peta.
Contoh berikut menunjukkan cara membuat instance penyedia lokasi armada untuk
skenario tugas terjadwal dan on-demand. Contoh ini juga menunjukkan cara menggunakan
locationRestriction
dalam konstruktor untuk membuat penyedia lokasi
aktif.
Perjalanan on-demand
JavaScript
locationProvider =
new google.maps.journeySharing
.FleetEngineFleetLocationProvider({
projectId,
authTokenFetcher,
// Optionally, specify location bounds to
// limit which vehicles are
// retrieved and immediately start tracking.
locationRestriction: {
north: 37.3,
east: -121.8,
south: 37.1,
west: -122,
},
// Optionally, specify a filter to limit
// which vehicles are retrieved.
vehicleFilter:
'attributes.foo = "bar" AND attributes.baz = "qux"',
});
TypeScript
locationProvider =
new google.maps.journeySharing
.FleetEngineFleetLocationProvider({
projectId,
authTokenFetcher,
// Optionally, specify location bounds to
// limit which vehicles are
// retrieved and immediately start tracking.
locationRestriction: {
north: 37.3,
east: -121.8,
south: 37.1,
west: -122,
},
// Optionally, specify a filter to limit
// which vehicles are retrieved.
vehicleFilter:
'attributes.foo = "bar" AND attributes.baz = "qux"',
});
Tugas terjadwal
JavaScript
locationProvider =
new google.maps.journeySharing
.FleetEngineDeliveryFleetLocationProvider({
projectId,
authTokenFetcher,
// Optionally, specify location bounds to
// limit which delivery vehicles are
// retrieved and immediately make the location provider active.
locationRestriction: {
north: 37.3,
east: -121.8,
south: 37.1,
west: -122,
},
// Optionally, specify a filter to limit
// which delivery vehicles are retrieved.
deliveryVehicleFilter:
'attributes.foo = "bar" AND attributes.baz = "qux"',
});
TypeScript
locationProvider =
new google.maps.journeySharing
.FleetEngineDeliveryFleetLocationProvider({
projectId,
authTokenFetcher,
// Optionally, specify location bounds to
// limit which delivery vehicles are
// retrieved and immediately make the location provider active.
locationRestriction: {
north: 37.3,
east: -121.8,
south: 37.1,
west: -122,
},
// Optionally, specify a filter to limit
// which delivery vehicles are retrieved.
deliveryVehicleFilter:
'attributes.foo = "bar" AND attributes.baz = "qux"',
});
Untuk menetapkan locationRestriction
setelah konstruktor, tambahkan
locationProvider.locationRestriction
nanti dalam kode Anda seperti
yang ditunjukkan dalam contoh JavaScript berikut.
// You can choose to not set locationRestriction in the constructor.
// In this case, the location provider *DOES NOT START* after this line, because
// no locationRestriction is set.
locationProvider = new google.maps.journeySharing.DeliveryFleetLocationProvider({
... // not setting locationRestriction here
});
// You can then set the locationRestriction *after* the constructor.
// After this line, the location provider is active.
locationProvider.locationRestriction = {
north: 1,
east: 2,
south: 0,
west: 1,
};
Menetapkan pembatasan lokasi menggunakan area pandang peta
Anda juga dapat menetapkan batas locationRestriction
agar cocok dengan area yang saat ini terlihat di tampilan peta.
Perjalanan on-demand
JavaScript
google.maps.event.addListenerOnce(
mapView.map, 'bounds_changed', () => {
const bounds = mapView.map.getBounds();
if (bounds) {
// If you did not specify a location restriction in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.locationRestriction = bounds;
}
});
TypeScript
google.maps.event.addListenerOnce(
mapView.map, 'bounds_changed', () => {
const bounds = mapView.map.getBounds();
if (bounds) {
// If you did not specify a location restriction in the
// location provider constructor, you may do so here.
// Location tracking will start as soon as this is set.
locationProvider.locationRestriction = bounds;
}
});
Tugas terjadwal
JavaScript
google.maps.event.addListenerOnce(
mapView.map, 'bounds_changed', () => {
const bounds = mapView.map.getBounds();
if (bounds) {
// If you did not specify a location restriction in the
// location provider constructor, you may do so here.
// Location provider will start as soon as this is set.
locationProvider.locationRestriction = bounds;
}
});
TypeScript
google.maps.event.addListenerOnce(
mapView.map, 'bounds_changed', () => {
const bounds = mapView.map.getBounds();
if (bounds) {
// If you did not specify a location restriction in the
// location provider constructor, you may do so here.
// Location provider will start as soon as this is set.
locationProvider.locationRestriction = bounds;
}
});
Melakukan inisialisasi tampilan peta
Setelah membuat penyedia lokasi, lakukan inisialisasi tampilan peta dengan cara yang sama seperti yang Anda lakukan saat mengikuti satu kendaraan.
Setelah memuat library JavaScript Journey Sharing, lakukan inisialisasi tampilan peta dan tambahkan ke halaman HTML. Halaman Anda harus berisi elemen <div> yang menyimpan tampilan peta. Elemen <div> bernama map_canvas dalam contoh berikut.=
Perjalanan on-demand
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);
Tugas terjadwal
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);
Memproses peristiwa dan menangani error
Setelah mulai mengikuti armada, Anda perlu memproses perubahan peristiwa dan menangani error yang muncul seperti yang dijelaskan di bagian berikut.
Memproses peristiwa perubahan
Anda dapat mengambil informasi meta tentang armada dari objek kendaraan menggunakan penyedia lokasi. Perubahan pada informasi meta akan memicu peristiwa update. Informasi meta mencakup properti kendaraan seperti status navigasi, jarak yang tersisa, dan atribut khusus.
Untuk mengetahui detailnya, lihat hal berikut:
Contoh berikut menunjukkan cara memproses peristiwa perubahan ini.
Perjalanan on-demand
JavaScript
locationProvider.addListener('update', e => {
// e.vehicles contains data that may be
// useful to the rest of the UI.
for (vehicle of e.vehicles) {
console.log(vehicle.navigationStatus);
}
});
TypeScript
locationProvider.addListener('update',
(e: google.maps.journeySharing.FleetEngineFleetLocationProviderUpdateEvent) => {
// e.vehicles contains data that may be
// useful to the rest of the UI.
if (e.vehicles) {
for (vehicle of e.vehicles) {
console.log(vehicle.navigationStatus);
}
}
});
Tugas terjadwal
JavaScript
locationProvider.addListener('update', e => {
// e.deliveryVehicles contains data that may be
// useful to the rest of the UI.
if (e.deliveryVehicles) {
for (vehicle of e.deliveryVehicles) {
console.log(vehicle.remainingDistanceMeters);
}
}
});
TypeScript
locationProvider.addListener('update',
(e: google.maps.journeySharing.FleetEngineDeliveryFleetLocationProviderUpdateEvent) => {
// e.deliveryVehicles contains data that may be
// useful to the rest of the UI.
if (e.deliveryVehicles) {
for (vehicle of e.deliveryVehicles) {
console.log(vehicle.remainingDistanceMeters);
}
}
});
Memantau error
Anda juga ingin memproses dan menangani error yang terjadi saat mengikuti kendaraan. Error yang muncul secara asinkron karena permintaan informasi kendaraan akan memicu peristiwa error.
Contoh berikut menunjukkan cara memproses peristiwa ini sehingga Anda dapat menangani error.
JavaScript
locationProvider.addListener('error', e => {
// e.error is the error that triggered the event.
console.error(e.error);
});
TypeScript
locationProvider.addListener('error', (e: google.maps.ErrorEvent) => {
// e.error is the error that triggered the event.
console.error(e.error);
});
Berhenti melacak armada
Untuk berhenti melacak armada, Anda menetapkan batas penyedia lokasi ke null, lalu menghapus penyedia lokasi dari tampilan peta seperti yang dijelaskan di bagian berikut.
Menetapkan batas penyedia lokasi ke null
Untuk menghentikan penyedia lokasi melacak fleet, tetapkan batas penyedia lokasi ke null.
Perjalanan on-demand
JavaScript
locationProvider.locationRestriction = null;
TypeScript
locationProvider.locationRestriction = null;
Tugas terjadwal
JavaScript
locationProvider.locationRestriction = null;
TypeScript
locationProvider.locationRestriction = null;
Menghapus penyedia lokasi dari tampilan peta
Contoh berikut menunjukkan cara menghapus penyedia lokasi dari tampilan peta.
JavaScript
mapView.removeLocationProvider(locationProvider);
TypeScript
mapView.removeLocationProvider(locationProvider);
Melacak kendaraan pengiriman saat melihat armada pengiriman
Jika menggunakan layanan Mobility untuk tugas terjadwal, Anda dapat melihat fleet serta menampilkan rute dan tugas mendatang untuk kendaraan pengiriman tertentu dalam tampilan peta yang sama. Untuk melakukannya, buat instance Penyedia Lokasi Armada Pengiriman dan Penyedia Lokasi Kendaraan Pengiriman, lalu tambahkan keduanya ke tampilan peta. Setelah dibuat instance-nya, penyedia lokasi armada pengiriman akan mulai menampilkan kendaraan pengiriman di peta. Contoh berikut menunjukkan cara membuat instance kedua penyedia lokasi:
JavaScript
deliveryFleetLocationProvider =
new google.maps.journeySharing
.FleetEngineDeliveryFleetLocationProvider({
projectId,
authTokenFetcher,
// Optionally, specify location bounds to
// limit which delivery vehicles are
// retrieved and immediately start tracking.
locationRestriction: {
north: 37.3,
east: -121.8,
south: 37.1,
west: -122,
},
// Optionally, specify a filter to limit
// which delivery vehicles are retrieved.
deliveryVehicleFilter:
'attributes.foo = "bar" AND attributes.baz = "qux"',
});
deliveryVehicleLocationProvider =
new google.maps.journeySharing
.FleetEngineDeliveryVehicleLocationProvider({
projectId,
authTokenFetcher
});
const mapView = new
google.maps.journeySharing.JourneySharingMapView({
element: document.getElementById('map_canvas'),
locationProviders: [
deliveryFleetLocationProvider,
deliveryVehicleLocationProvider,
],
// Any other options
});
TypeScript
deliveryFleetLocationProvider =
new google.maps.journeySharing
.FleetEngineDeliveryFleetLocationProvider({
projectId,
authTokenFetcher,
// Optionally, specify location bounds to
// limit which delivery vehicles are
// retrieved and immediately start tracking.
locationRestriction: {
north: 37.3,
east: -121.8,
south: 37.1,
west: -122,
},
// Optionally, specify a filter to limit
// which delivery vehicles are retrieved.
deliveryVehicleFilter:
'attributes.foo = "bar" AND attributes.baz = "qux"',
});
deliveryVehicleLocationProvider =
new google.maps.journeySharing
.FleetEngineDeliveryVehicleLocationProvider({
projectId,
authTokenFetcher
});
const mapView = new
google.maps.journeySharing.JourneySharingMapView({
element: document.getElementById('map_canvas'),
locationProviders: [
deliveryFleetLocationProvider,
deliveryVehicleLocationProvider,
],
// Any other options
});
Menggunakan penyesuaian penanda untuk melacak kendaraan pengiriman
Agar penyedia lokasi kendaraan pengiriman dapat melacak kendaraan pengiriman saat Anda mengklik penanda armadanya, ikuti langkah-langkah berikut:
Menyesuaikan penanda dan menambahkan tindakan klik.
Sembunyikan penanda untuk mencegah penanda duplikat.
Contoh untuk langkah-langkah ini ada di bagian berikut.
Menyesuaikan penanda dan menambahkan tindakan klik
JavaScript
// Specify the customization function either separately, or as a field in
// the options for the delivery fleet location provider constructor.
deliveryFleetLocationProvider.deliveryVehicleMarkerCustomization =
(params) => {
if (params.isNew) {
params.marker.addListener('click', () => {
// params.vehicle.name follows the format
// "providers/{provider}/deliveryVehicles/{vehicleId}".
// Only the vehicleId portion is used for the delivery vehicle
// location provider.
deliveryVehicleLocationProvider.deliveryVehicleId =
params.vehicle.name.split('/').pop();
});
}
};
TypeScript
// Specify the customization function either separately, or as a field in
// the options for the delivery fleet location provider constructor.
deliveryFleetLocationProvider.deliveryVehicleMarkerCustomization =
(params: google.maps.journeySharing.DeliveryVehicleMarkerCustomizationFunctionParams) => {
if (params.isNew) {
params.marker.addListener('click', () => {
// params.vehicle.name follows the format
// "providers/{provider}/deliveryVehicles/{vehicleId}".
// Only the vehicleId portion is used for the delivery vehicle
// location provider.
deliveryVehicleLocationProvider.deliveryVehicleId =
params.vehicle.name.split('/').pop();
});
}
};
Menyembunyikan penanda untuk mencegah penanda duplikat
Sembunyikan penanda dari penyedia lokasi kendaraan pengiriman untuk mencegah rendering dua penanda untuk kendaraan yang sama:
JavaScript
// Specify the customization function either separately, or as a field in
// the options for the delivery vehicle location provider constructor.
deliveryVehicleLocationProvider.deliveryVehicleMarkerCustomization =
(params) => {
if (params.isNew) {
params.marker.setVisible(false);
}
};
TypeScript
// Specify the customization function either separately, or as a field in
// the options for the delivery vehicle location provider constructor.
deliveryVehicleLocationProvider.deliveryVehicleMarkerCustomization =
(params: deliveryVehicleMarkerCustomizationFunctionParams) => {
if (params.isNew) {
params.marker.setVisible(false);
}
};