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Change a layer's color with buttons

Use setPaintProperty to change a layer's fill color.

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Change a layer's color with buttons</title>
    <meta property="og:description" content="Use setPaintProperty to change a layer's fill color." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel='stylesheet' href='https://unpkg.com/maplibre-gl@4.4.0/dist/maplibre-gl.css' />
    <script src='https://unpkg.com/maplibre-gl@4.4.0/dist/maplibre-gl.js'></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 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 for="layer">Select layer</label>
            <select id="layer" name="layer">
                <option value="water">Water</option>
                <option value="building-3d">Buildings</option>
            </select>
        </fieldset>
        <fieldset>
            <label>Choose a color</label>
            <div id="swatches"></div>
        </fieldset>
    </div>
</div>

<script>
    const map = new maplibregl.Map({
        container: 'map',
        style: 'https://api.maptiler.com/maps/streets/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL',
        center: [12.338, 45.4385],
        zoom: 17.4
    });

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

    colors.forEach((color) => {
        const swatch = document.createElement('button');
        swatch.style.backgroundColor = color;
        swatch.addEventListener('click', () => {
            map.setPaintProperty(
                layer.value,
                layer.value === 'water' ? 'fill-color' : 'fill-extrusion-color',
                color
            );
        });
        swatches.appendChild(swatch);
    });
</script>
</body>
</html>