Add live realtime data | Mapbox GL JS

Use realtime location data streams to move a symbol on your map with setInterval.

Referencing images in a style's sprite

This example uses the Mapbox Streets style. The icon-image used in this example comes from the Mapbox Streets style's sprite.

To view all available images in a style's sprite or add additional images, open the style in Mapbox Studio and click the Images tab. To add a new image to the style at runtime see the Add an icon to the map example.

JavaScript

React

JavaScript

React


<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Add live realtime data</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.8.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.8.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>

<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
    const map = new mapboxgl.Map({
        container: 'map',
        // Choose from Mapbox's core styles, or make your own style with Mapbox Studio
        style: 'mapbox://styles/mapbox/streets-v12',
        zoom: 1.5
    });

    map.on('load', async () => {
        // Get the initial location of the International Space Station (ISS).
        const geojson = await getLocation();
        // Add the ISS location as a source.
        map.addSource('iss', {
            type: 'geojson',
            data: geojson
        });
        // Add the rocket symbol layer to the map.
        map.addLayer({
            'id': 'iss',
            'type': 'symbol',
            'source': 'iss',
            'layout': {
                // This icon is a part of the Mapbox Streets style.
                // To view all images available in a Mapbox style, open
                // the style in Mapbox Studio and click the "Images" tab.
                // To add a new image to the style at runtime see
                // https://docs.mapbox.com/mapbox-gl-js/example/add-image/
                'icon-image': 'rocket'
            }
        });

        // Update the source from the API every 2 seconds.
        const updateSource = setInterval(async () => {
            const geojson = await getLocation(updateSource);
            map.getSource('iss').setData(geojson);
        }, 2000);

        async function getLocation(updateSource) {
            // Make a GET request to the API and return the location of the ISS.
            try {
                const response = await fetch(
                    'https://api.wheretheiss.at/v1/satellites/25544',
                    { method: 'GET' }
                );
                const { latitude, longitude } = await response.json();
                // Fly the map to the location.
                map.flyTo({
                    center: [longitude, latitude],
                    speed: 0.5
                });
                // Return the location of the ISS as GeoJSON.
                return {
                    'type': 'FeatureCollection',
                    'features': [
                        {
                            'type': 'Feature',
                            'geometry': {
                                'type': 'Point',
                                'coordinates': [longitude, latitude]
                            }
                        }
                    ]
                };
            } catch (err) {
                // If the updateSource interval is defined, clear the interval to stop updating the source.
                if (updateSource) clearInterval(updateSource);
                throw new Error(err);
            }
        }
    });
</script>

</body>
</html>

このコードスニペットは、YOUR_MAPBOX_ACCESS_TOKENをあなたのMapboxアカウントのアクセストークンに置き換えるまで、期待通りに動作しません。

JavaScript

React


import React, { useEffect, useRef, useState } from 'react';
import mapboxgl from 'mapbox-gl';

import 'mapbox-gl/dist/mapbox-gl.css';

const MapboxExample = () => {
  const mapContainerRef = useRef();
  const mapRef = useRef();

  const [data, setData] = useState();

  useEffect(() => {
    // TO MAKE THE MAP APPEAR YOU MUST
    // ADD YOUR ACCESS TOKEN FROM
    // https://account.mapbox.com
    mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';

    mapRef.current = new mapboxgl.Map({
      container: mapContainerRef.current,
      style: 'mapbox://styles/mapbox/streets-v12',
      zoom: 1.5
    });

    mapRef.current.on('load', async () => {
      const geojson = await getLocation();

      mapRef.current.addSource('iss', {
        type: 'geojson',
        data: geojson
      });

      mapRef.current.addLayer({
        id: 'iss',
        type: 'symbol',
        source: 'iss',
        layout: {
          'icon-image': 'rocket'
        }
      });

      const updateSource = setInterval(async () => {
        await getLocation(updateSource);
      }, 2000);

      async function getLocation(updateSource) {
        try {
          const response = await fetch(
            'https://api.wheretheiss.at/v1/satellites/25544',
            { method: 'GET' }
          );
          const { latitude, longitude } = await response.json();

          setData({
            type: 'FeatureCollection',
            features: [
              {
                type: 'Feature',
                geometry: {
                  type: 'Point',
                  coordinates: [longitude, latitude]
                }
              }
            ]
          });
        } catch (err) {
          if (updateSource) clearInterval(updateSource);
          throw new Error(err);
        }
      }
    });

    return () => {
      mapRef.current.remove();
    };
  }, []);

  useEffect(() => {
    if (!data) return;

    mapRef.current.getSource('iss').setData(data);

    mapRef.current.flyTo({
      center: data.features[0].geometry.coordinates,
      speed: 0.5
    });
  }, [data]);

  return <div ref={mapContainerRef} id="map" style={{ height: '100%' }} />;
};

export default MapboxExample;

このコードスニペットは、YOUR_MAPBOX_ACCESS_TOKENをあなたのMapboxアカウントのアクセストークンに置き換えるまで、期待通りに動作しません。

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