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Change a map's language

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Use setLayoutProperty to switch languages dynamically. For a more complete solution see the mapbox-gl-language plugin.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Change a map's language</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.9.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.9.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
    #buttons {
        width: 90%;
        margin: 0 auto;
    }
    .button {
        display: inline-block;
        position: relative;
        cursor: pointer;
        width: 20%;
        padding: 8px;
        border-radius: 3px;
        margin-top: 10px;
        font-size: 12px;
        text-align: center;
        color: #fff;
        background: #ee8a65;
        font-family: sans-serif;
        font-weight: bold;
    }
</style>
<div id="map"></div>
<ul id="buttons">
    <li id="button-fr" class="button">French</li>
    <li id="button-ru" class="button">Russian</li>
    <li id="button-de" class="button">German</li>
    <li id="button-es" class="button">Spanish</li>
</ul>
<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',
        center: [16.05, 48],
        zoom: 2.9
    });

    document.getElementById('buttons').addEventListener('click', (event) => {
        const language = event.target.id.substr('button-'.length);
        // Use setLayoutProperty to set the value of a layout property in a style layer.
        // The three arguments are the id of the layer, the name of the layout property,
        // and the new property value.
        map.setLayoutProperty('country-label', 'text-field', [
            'get',
            `name_${language}`
        ]);
    });
</script>

</body>
</html>
This code snippet will not work as expected until you replace YOUR_MAPBOX_ACCESS_TOKEN with an access token from your Mapbox account.
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