mapbox / mapbox-gl-accessibility

Mapbox GL Accessibility Plugin

An accessibility control for mapbox-gl-js.

Note: This is a work in progress and we welcome contributions. See issues to learn what needs to be worked on!

Demo

1. Go to https://labs.mapbox.com/mapbox-gl-accessibility
2. Enable voice-over in your browser
3. Press tab to hear the result

Usage

// Should be run after the map has been initialized

map.on('load', () => {
  map.addControl(new MapboxAccessibility({

    // A string value representing a property key in the data. This
    // will be used as the text in voiceover.
    accessibleLabelProperty: 'name',

    // The layers within the style that
    // 1. Contain the `accessibleLabelProperty` value as a key
    // 2. Should be used for voiceover.
    layers: [
      'poi-label',
      'transit-label'
    ]
  }));
});

MapboxAccessibility will locate features that belong to layers cooresponding to the layers option array and add button elements to the map. To hide these visually but still allow them to be picked up by a screen reader, add the following CSS to your page:

.mapboxgl-accessibility-marker {
  background: transparent;
  margin: 0;
  padding: 0;
  appearance: none;
  border-radius: 0;
  border: none;
  position: fixed;
}

.mapboxgl-accessibility-marker:focus {
  border: 2px solid black;
}

Developing

npm install & npm start

Visit http://localhost:5000/examples/ to load the demo. You also need to store an access token in localstorage. Open developer tools, locate the console tab and insert:

localStorage.setItem('accessToken', {your token});

Tests

MAPBOX_ACCESS_TOKEN={your token} npm run test