JSFiddle - React, Tailwind, and code Playground

by Jason Bellis

HTML

<link rel="stylesheet" href="https://api.tiles.mapbox.com/mapbox-gl-js/v0.38.0/mapbox-gl.css">
<script src="https://api.tiles.mapbox.com/mapbox-gl-js/v0.38.0/mapbox-gl.js"></script>
<div id='map'></div>

CSS

body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }

JavaScript

mapboxgl.accessToken = 'pk.eyJ1Ijoic3Rvb2t5IiwiYSI6ImNpZWxncnU5MDAwYTNzZWt1N2VoNHBiajYifQ.PPBpAP3rWcAAnMiAu1iJLg';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/streets-v9',
    center: [-100.486052, 37.830348],
    zoom: 2
});

map.showTileBoundaries = true;

map.on('load', function () {
    map.addSource("states", {
        "type": "geojson",
        "data": "https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_110m_admin_1_states_provinces.geojson"
    });

    map.addLayer({
        "id": "state-fills",
        "type": "fill",
        "source": "states",
        "layout": {},
        "paint": {
            "fill-color": "#627BC1",
            "fill-opacity": 0.5
        }
    });

    map.addLayer({
        "id": "state-borders",
        "type": "line",
        "source": "states",
        "layout": {},
        "paint": {
            "line-color": "#627BC1",
            "line-width": 2
        }
    });

    map.addLayer({
        "id": "state-fills-hover",
        "type": "fill",
        "source": "states",
        "layout": {},
        "paint": {
            "fill-color": "#627BC1",
            "fill-opacity": 1
        },
        "filter": ["==", "name", ""]
    });

    // When the user moves their mouse over the states-fill layer, we'll update the filter in
    // the state-fills-hover layer to only show the matching state, thus making a hover effect.
    map.on("mousemove", "state-fills", function(e) {
        map.setFilter("state-fills-hover", ["==", "name", e.features[0].properties.name]);
    });

    // Reset the state-fills-hover layer's filter when the mouse leaves the layer.
    map.on("mouseleave", "state-fills", function() {
        map.setFilter("state-fills-hover", ["==", "name", ""]);
    });
});