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Change worldview of administrative boundaries

Additional Developer Resources

This example uses the worldview value to adjust administrative boundaries based on the map's audience. Read more about worldviews.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Change worldview of administrative boundaries</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>
    #menu {
        position: absolute;
        background: #fff;
        padding: 20px;
        margin: 20px;
        font-family: 'Open Sans', sans-serif;
        max-width: 180px;
    }
    #worldview-options {
        margin-top: 10px;
    }
</style>

<div id="map"></div>
<div id="menu">
    <div>
        Display administrative boundaries consistent with the following
        worldview:
    </div>
    <!-- The worldview options will be built dynamically using JavaScript (below). -->
    <div id="worldview-options"></div>
</div>

<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',
        // The worldview data field is only available in styles
        // that use the Mapbox Streets v8 tileset
        // https://docs.mapbox.com/vector-tiles/reference/mapbox-streets-v8/
        // or Mapbox Boundaries v3 tileset
        // https://docs.mapbox.com/vector-tiles/reference/mapbox-boundaries-v3/
        // Choose from Mapbox's core styles, or make your own style with Mapbox Studio
        style: 'mapbox://styles/mapbox/light-v11',
        center: [88, 26],
        zoom: 4
    });

    // List the worldviews options you want users to select from. For
    // available worldviews, see https://docs.mapbox.com/help/glossary/worldview/.
    const availableWorldViews = [
        {
            code: 'CN',
            name: 'China'
        },
        {
            code: 'IN',
            name: 'India'
        },
        {
            code: 'JP',
            name: 'Japan'
        },
        {
            code: 'US',
            name: 'United States'
        }
    ];

    // Choose a worldview you want to use when the map is first loaded.
    // Styles created by Mapbox default to "US" as the initial worldview.
    const worldViewOnMapLoad = 'US';

    // Build the menu.
    // Alternatively, you could hard code the menu in your HTML directly.
    const worldViewOptions = document.getElementById('worldview-options');

    for (const worldView of availableWorldViews) {
        // Create three new elements for each worldview.
        const radioItem = document.createElement('div');
        const radioInput = document.createElement('input');
        const radioLabel = document.createElement('label');

        // Assign attributes based on the worldview.
        radioInput.type = 'radio';
        radioInput.name = 'toggle-worldview';
        radioInput.id = worldView.code;
        radioInput.value = worldView.code;
        radioInput.checked = worldView.code === worldViewOnMapLoad;
        radioLabel.htmlFor = worldView.code;
        radioLabel.innerText = `${worldView.code} (${worldView.name})`;

        // Append the input and label elements to the radioItem div.
        radioItem.appendChild(radioInput);
        radioItem.appendChild(radioLabel);

        // Append the radioItem div to the worldViewOptions div that
        // will contain all the radio buttons.
        worldViewOptions.appendChild(radioItem);
    }

    // Wait for the map to finish loading.
    map.on('load', () => {
        // Filter the "admin-0-*" layers to display
        // administrative boundaries consistent with the
        // initial worldview defined above ("CN").
        filterLayers(worldViewOnMapLoad);

        // Get all the worldview option inputs and loop through them.
        const inputs = worldViewOptions.getElementsByTagName('input');

        for (const input of inputs) {
            // Specify that the switchWorldview function
            // (defined below) should run every time an input
            // is clicked.
            input.onclick = (option) => {
                // Create a function that will identify which worldview
                // is currently selected and run the filterLayers function
                // with that worldview as an argument.
                filterLayers(option.target.id);
            };
        }
    });

    // Update the filter for each "admin-0-*" layer, which contain
    // administrative boundaries at the country level.
    // These are the same filters used in the Mapbox Light
    // style except that the worldview is based on user input.
    function filterLayers(worldview) {
        // The "admin-0-boundary-disputed" layer shows boundaries
        // at this level that are known to be disputed.
        map.setFilter('admin-0-boundary-disputed', [
            'all',
            ['==', ['get', 'disputed'], 'true'],
            ['==', ['get', 'admin_level'], 0],
            ['==', ['get', 'maritime'], 'false'],
            ['match', ['get', 'worldview'], ['all', worldview], true, false]
        ]);
        // The "admin-0-boundary" layer shows all boundaries at
        // this level that are not disputed.
        map.setFilter('admin-0-boundary', [
            'all',
            ['==', ['get', 'admin_level'], 0],
            ['==', ['get', 'disputed'], 'false'],
            ['==', ['get', 'maritime'], 'false'],
            ['match', ['get', 'worldview'], ['all', worldview], true, false]
        ]);
        // The "admin-0-boundary-bg" layer helps features in both
        // "admin-0-boundary" and "admin-0-boundary-disputed" stand
        // out visually.
        map.setFilter('admin-0-boundary-bg', [
            'all',
            ['==', ['get', 'admin_level'], 0],
            ['==', ['get', 'maritime'], 'false'],
            ['match', ['get', 'worldview'], ['all', worldview], true, false]
        ]);
    }
</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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