Add a new layer below labels | Mapbox GL JS

This example uses the second argument of addLayer to add a new layer in a precise place in the stack, below the symbol layer that contains labels.

The new fill layer uses an external geojson source to add polygon features that are styled with a pink (#f08) fill-color.

JavaScript

React

JavaScript

React


<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Add a new layer below labels</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',
        center: [-88.137343, 35.137451],
        zoom: 3,
        maxZoom: 6
    });

    map.on('load', () => {
        const layers = map.getStyle().layers;
        // Find the index of the first symbol layer in the map style.
        let firstSymbolId;
        for (const layer of layers) {
            if (layer.type === 'symbol') {
                firstSymbolId = layer.id;
                break;
            }
        }

        map.addSource('urban-areas', {
            'type': 'geojson',
            'data': 'https://docs.mapbox.com/mapbox-gl-js/assets/ne_50m_urban_areas.geojson'
        });
        map.addLayer(
            {
                'id': 'urban-areas-fill',
                'type': 'fill',
                'source': 'urban-areas',
                'layout': {},
                'paint': {
                    'fill-color': '#f08',
                    'fill-opacity': 0.4
                }
                // This is the important part of this example: the addLayer
                // method takes 2 arguments: the layer as an object, and a string
                // representing another layer's name. If the other layer
                // exists in the style already, the new layer will be positioned
                // right before that layer in the stack, making it possible to put
                // 'overlays' anywhere in the layer stack.
                // Insert the layer beneath the first symbol layer.
            },
            firstSymbolId
        );
    });
</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 } from 'react';
import mapboxgl from 'mapbox-gl';

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

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

  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',
      center: [-88.137343, 35.137451],
      zoom: 3,
      maxZoom: 6
    });

    mapRef.current.on('load', () => {
      const layers = mapRef.current.getStyle().layers;
      let firstSymbolId;
      for (const layer of layers) {
        if (layer.type === 'symbol') {
          firstSymbolId = layer.id;
          break;
        }
      }

      mapRef.current.addSource('urban-areas', {
        type: 'geojson',
        data: 'https://docs.mapbox.com/mapbox-gl-js/assets/ne_50m_urban_areas.geojson'
      });
      mapRef.current.addLayer(
        {
          id: 'urban-areas-fill',
          type: 'fill',
          source: 'urban-areas',
          layout: {},
          paint: {
            'fill-color': '#f08',
            'fill-opacity': 0.4
          }
        },
        firstSymbolId
      );
    });
  }, []);

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

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。

追加の開発者リソース

このexampleは役に立ちましたか？