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Change a layer's color with buttons

Use setPaintProperty to change the fill color of a specific feature layer.

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <script src="https://cdn.smartmaps.cloud/packages/smartmaps/smartmaps-gl/v2/umd/smartmaps-gl.min.js"></script>
        <style>
            body {
                margin: 0;
                padding: 0;
            }

            html,
            body,
            #map {
                height: 400px;
            }

            .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>
    </head>

    <body>
        <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-ocean">Ocean</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 smartmapsgl.Map({
                apiKey: "INSERT API-KEY",
                container: "map",
                center: [13.377702, 52.51628],
                zoom: 3,
                style: smartmapsgl.MapStyle.AUTO,
            });

            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-ocean"
                            ? "fill-color"
                            : "fill-extrusion-color",
                        color
                    );
                });
                swatches.appendChild(swatch);
            });
        </script>
    </body>
</html>