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Change the case of labels

Use the upcase and downcase expressions to change the case of labels.

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Change the case of labels</title>
    <meta property="og:description" content="Use the upcase and downcase expressions to change the case of labels." />
    <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%; }
    </style>
</head>
<body>
    <div id="map"></div>
<script>
    const map = new trackasiagl.Map({
        container: 'map', // container id
        style: 'https://maps.track-asia.com/styles/v1/streets.json?key=public_key', // stylesheet location
        center: {"lat":10.762622,"lng":106.660172}, // starting position
        zoom: 12 // starting zoom
    });

    map.on('load', () => {
        // data from https://opendata.cityofboise.org/
        map.addSource('off-leash-areas', {
            'type': 'geojson',
            'data': 'https://docs.track-asia.com/assets/boise.geojson'
        });
        map.addLayer({
            'id': 'off-leash-areas',
            'type': 'symbol',
            'source': 'off-leash-areas',
            'layout': {
                'icon-image': 'dog-park-11',
                'text-field': [
                    'format',
                    ['upcase', ['get', 'FacilityName']],
                    { 'font-scale': 0.8 },
                    '\n',
                    {},
                    ['downcase', ['get', 'Comments']],
                    { 'font-scale': 0.6 }
                ],
                'text-font': ['Noto Sans Bold'],
                'text-offset': [0, 0.6],
                'text-anchor': 'top'
            }
        });
    });
</script>

</body>
</html>