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/**
 * Switches the map language to simplified Chinese
 *
 * @param  {H.Map} map      A HERE Map instance within the application
 * @pama   {H.service.Platform} platform    A stub class to access HERE services
 */
function switchMapLanguage(map, platform){
  var mapTileService = platform.getMapTileService({
      type: 'base'
    }),
    // Our layer will load tiles from the HERE Map Tile API
    chineseMapLayer = mapTileService.createTileLayer(
      'maptile',
      'normal.day',
      pixelRatio === 1 ? 256 : 512,
      'png8',
      {lg: 'CHI', ppi: pixelRatio === 1 ? undefined : 320}
    );
  map.setBaseLayer(chineseMapLayer);

  // Display default UI components on the map and change default
  // language to simplified Chinese.
  // Besides supported language codes you can also specify your custom translation
  // using H.ui.i18n.Localization.
  var ui = H.ui.UI.createDefault(map, defaultLayers, 'zh-CN');

  // Remove not needed settings control
  ui.removeControl('mapsettings');
}





/**
 * Boilerplate map initialization code starts below:
 */

//Step 1: initialize communication with the platform
var platform = new H.service.Platform({
  app_id: window.app_id,
  app_code: window.app_code,
  useHTTPS: true
});
var pixelRatio = window.devicePixelRatio || 1;
var defaultLayers = platform.createDefaultLayers({
  tileSize: pixelRatio === 1 ? 256 : 512,
  ppi: pixelRatio === 1 ? undefined : 320
});

//Step 2: initialize a map - this map is centered over Hong Kong.
var map = new H.Map(document.getElementById('map'),
  defaultLayers.normal.map,{
  center: {lat:22.2783, lng:114.1588},
  zoom: 12,
  pixelRatio: pixelRatio
});
// add a resize listener to make sure that the map occupies the whole container
window.addEventListener('resize', () => map.getViewPort().resize());

//Step 3: make the map interactive
// MapEvents enables the event system
// Behavior implements default interactions for pan/zoom (also on mobile touch environments)
var behavior = new H.mapevents.Behavior(new H.mapevents.MapEvents(map));

// Now use the map as required...
switchMapLanguage(map, platform);                  
                
                  
                  
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=yes">
    <meta http-equiv="Content-type" content="text/html;charset=UTF-8">
    <title>Multi-language support</title>
    <link rel="stylesheet" type="text/css" href="https://js.api.here.com/v3/3.0/mapsjs-ui.css" />
    <link rel="stylesheet" type="text/css" href="demo.css" />
    <link rel="stylesheet" type="text/css" href="styles.css" />
    <link rel="stylesheet" type="text/css" href="../template.css" />
    <script type="text/javascript" src='../test-credentials.js'></script>

    <script type="text/javascript" src="https://js.api.here.com/v3/3.0/mapsjs-core.js"></script>
    <script type="text/javascript" src="https://js.api.here.com/v3/3.0/mapsjs-service.js"></script>
    <script type="text/javascript" src="https://js.api.here.com/v3/3.0/mapsjs-ui.js"></script>
    <script type="text/javascript" src="https://js.api.here.com/v3/3.0/mapsjs-mapevents.js"></script>
  <script type="text/javascript" src='../js-examples-rendering-helpers/iframe-height.js'></script></head>
  <body id="markers-on-the-map">
    <div class="page-header">
        <h1>Multi-language support</h1>
        <p>Display a map with labels in a foreign language</p>
    </div>
    <p>This example displays a movable map initially centered over <b>Hong Kong</b> <i>(22.2917°N, 114.1872°E)</i> with map labels in simplified Chinese.</i></p>
    <div id="map"></div>
    <h3>Code</h3>
    <p>A reference to the base map tile service is obtained using the <code>H.service.Platform</code>. 
      Alternate languages can be requested by adding the <code>lg</code> parameter to the tile requests. 
      That is done by calling createTileLayer method. 5th argument is list of key/value parameters which are 
      passed to the map tile service when requesting each tile. List of all supported map languages can be found at HERE Map Tile API Reference.</p>
    <p>It is possible to specify map language for all layers at once when using <code>H.service.Platform.createDefaultLayers</code> method.</p>
    <p>Language of the UI controls can be specified when calling <code>H.ui.UI.createDefault</code> method. 
      3rd argument is either a supported language code or a custom <code>H.ui.i18n.Localization object</code>.</p>
    <script type="text/javascript" src='demo.js'></script>
  </body>
</html>