ラベル下に新しいレイヤーを追加
addLayer の 2 番目の引数を使用すると、より正確に行うことができます。
<!DOCTYPE html><html><head><meta charset="utf-8"><title>ラベル下に新しいレイヤーを追加</title><meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no"><link href="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.css" rel="stylesheet"><script src="https://api.mapbox.com/mapbox-gl-js/v2.14.1/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',style: 'mapbox://styles/mapbox/streets-v11',center: [-88.13734351262877, 35.137451890638886],zoom: 4}); map.on('load', () => {const layers = map.getStyle().layers;// Find the index of the first symbol layer in the map stylelet firstSymbolId;for (const layer of layers) {if (layer === '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 stylesheet 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>