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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=1.0">
    <link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/trackasia-gl.css" />
    <script src="https://unpkg.com/[email protected]/dist/trackasia-gl.js"></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
        .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="building">Buildings</option>
                <option value="water">Water</option>
            </select>
        </fieldset>
        <fieldset>
            <label>Choose a color</label>
            <div id="swatches"></div>
        </fieldset>
    </div>
</div>

<script>
    const map = new trackasiagl.Map({
        container: 'map',
        style: 'https://maps.track-asia.com/styles/v1/streets.json?key=public_key',
        center: {"lat":10.762622,"lng":106.660172},
        zoom: 16
    });

    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,
                'fill-color',
                color
            );
        });
        swatches.appendChild(swatch);
    });
</script>

</body>
</html>