Change a layer's color with buttons | Mapbox GL JS

This example uses setPaintProperty to change the colors of different fill layers on a map:

The water and building layers use the Mapbox Streets v8 vector tileset from the Mapbox Light style (light-v10) as a vector source.
The triangles custom layer, added with addLayer, uses a custom tileset (examples.ckv9z0wgf5v7c27p7me2mf0l9-9wrve) as a vector source.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Change a layer's color with buttons</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.3.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.3.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
    .map-overlay {
        font:
            12px/20px 'Helvetica Neue',
            Arial,
            Helvetica,
            sans-serif;
        position: absolute;
        width: 200px;
        top: 0;
        left: 0;
        padding: 10px;
    }

    .map-overlay .map-overlay-inner {
        background-color: #fff;
        box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
        border-radius: 3px;
        padding: 10px;
        margin-bottom: 10px;
    }

    .map-overlay-inner fieldset {
        border: none;
        padding: 0;
        margin: 0 0 10px;
    }

    .map-overlay-inner fieldset:last-child {
        margin: 0;
    }

    .map-overlay-inner select {
        width: 100%;
    }

    .map-overlay-inner label {
        display: block;
        font-weight: bold;
        margin: 0 0 5px;
    }

    .map-overlay-inner button {
        display: inline-block;
        width: 36px;
        height: 20px;
        border: none;
        cursor: pointer;
    }

    .map-overlay-inner button:focus {
        outline: none;
    }

    .map-overlay-inner button:hover {
        box-shadow: inset 0 0 0 3px rgba(0, 0, 0, 0.1);
    }
</style>

<div id="map"></div>
<div class="map-overlay top">
    <div class="map-overlay-inner">
        <fieldset>
            <label>Select layer</label>
            <select id="layer" name="layer">
                <!-- Each value matches a layer ID. -->
                <option value="water">Water</option>
                <option value="building">Buildings</option>
                <option value="triangles">Triangles</option>
            </select>
        </fieldset>
        <fieldset>
            <label>Choose a color</label>
            <div id="swatches"></div>
        </fieldset>
    </div>
</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/light-v11', // style URL for Mapbox Light
        center: [12.338, 45.4385],
        zoom: 18
    });

    map.on('load', () => {
        // Add a custom layer that uses
        // a vector tileset source.
        map.addLayer({
            id: 'triangles',
            source: {
                type: 'vector',
                url: 'mapbox://examples.ckv9z0wgf5v7c27p7me2mf0l9-9wrve' // custom tileset
            },
            'source-layer': 'triangles',
            type: 'fill'
        });
    });

    const swatches = document.getElementById('swatches');
    const layer = document.getElementById('layer');
    const colors = [
        '#ffffcc',
        '#a1dab4',
        '#41b6c4',
        '#2c7fb8',
        '#253494',
        '#fed976',
        '#feb24c',
        '#fd8d3c',
        '#f03b20',
        '#bd0026'
    ];

    for (const color of colors) {
        const swatch = document.createElement('button');
        swatch.style.backgroundColor = color;
        swatch.addEventListener('click', () => {
            map.setPaintProperty(layer.value, 'fill-color', color);
        });
        swatches.appendChild(swatch);
    }
</script>

</body>
</html>

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