Change worldview of administrative boundaries
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/v3.7.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.7.0/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>
import React, { useEffect, useRef, useState } from 'react';
import mapboxgl from 'mapbox-gl';
import 'mapbox-gl/dist/mapbox-gl.css';
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
const [worldview, setWorldview] = useState('US');
const [mapLoaded, setMapLoaded] = useState(false);
useEffect(() => {
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
mapRef.current = new mapboxgl.Map({
container: mapContainerRef.current,
style: 'mapbox://styles/mapbox/light-v11',
center: [88, 26],
zoom: 4
});
mapRef.current.on('load', () => {
setMapLoaded(true);
});
}, []);
useEffect(() => {
if (!mapLoaded) return;
mapRef.current.setFilter('admin-0-boundary-disputed', [
'all',
['==', ['get', 'disputed'], 'true'],
['==', ['get', 'admin_level'], 0],
['==', ['get', 'maritime'], 'false'],
['match', ['get', 'worldview'], ['all', worldview], true, false]
]);
mapRef.current.setFilter('admin-0-boundary', [
'all',
['==', ['get', 'admin_level'], 0],
['==', ['get', 'disputed'], 'false'],
['==', ['get', 'maritime'], 'false'],
['match', ['get', 'worldview'], ['all', worldview], true, false]
]);
mapRef.current.setFilter('admin-0-boundary-bg', [
'all',
['==', ['get', 'admin_level'], 0],
['==', ['get', 'maritime'], 'false'],
['match', ['get', 'worldview'], ['all', worldview], true, false]
]);
}, [worldview]);
const handleChange = (e) => {
setWorldview(e.target.id);
};
return (
<>
<div ref={mapContainerRef} id="map" style={{ height: '100%' }}></div>
<div
id="menu"
style={{
position: 'absolute',
background: '#fff',
padding: '20px',
margin: '20px',
fontFamily: "'Open Sans', sans-serif",
maxWidth: '180px',
top: 0
}}
>
<div>
Display administrative boundaries consistent with the following
worldview:
</div>
<div id="worldview-options" style={{ marginTop: '10px' }}>
<div>
<input
type="radio"
name="toggle-worldview"
id="CN"
value="CN"
onChange={handleChange}
checked={worldview === 'CN'}
/>
<label htmlFor="CN">CN (China)</label>
</div>
<div>
<input
type="radio"
name="toggle-worldview"
id="IN"
value="IN"
onChange={handleChange}
checked={worldview === 'IN'}
/>
<label htmlFor="IN">IN (India)</label>
</div>
<div>
<input
type="radio"
name="toggle-worldview"
id="JP"
value="JP"
onChange={handleChange}
checked={worldview === 'JP'}
/>
<label htmlFor="JP">JP (Japan)</label>
</div>
<div>
<input
type="radio"
name="toggle-worldview"
id="US"
value="US"
onChange={handleChange}
checked={worldview === 'US'}
/>
<label htmlFor="US">US (United States)</label>
</div>
</div>
</div>
</>
);
};
export default MapboxExample;
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