• JavaScript
  • HTML

 * The function add the "change" event listener to the map's style
 * and modifies colors of the map features within that listener.
 * @param  {H.Map} map      A HERE Map instance within the application
function changeFeatureStyle(map){
  // get the vector provider from the base layer
  var provider = map.getBaseLayer().getProvider();

  // get the style object for the base layer
  var parkStyle = provider.getStyle();

  var changeListener = (evt) => {
    if (parkStyle.getState() === H.map.Style.State.READY) {
      parkStyle.removeEventListener('change', changeListener);

      // query the sub-section of the style configuration
      // the call removes the subsection from the original configuration
      var parkConfig = parkStyle.extractConfig(['landuse.park', 'landuse.builtup']);
      // change the color, for the description of the style section
      // see the Developer's guide
      parkConfig.layers.landuse.park.draw.polygons.color = '#2ba815'
      parkConfig.layers.landuse.builtup.draw.polygons.color = '#676d67'

      // merge the configuration back to the base layer configuration

  parkStyle.addEventListener('change', changeListener);

 * Boilerplate map initialization code starts below:

//Step 1: initialize communication with the platform
// In your own code, replace variable window.apikey with your own apikey

var platform = new H.service.Platform({
  apikey: window.apikey
var defaultLayers = platform.createDefaultLayers();

//Step 2: initialize a map
var map = new H.Map(document.getElementById('map'),
  defaultLayers.vector.normal.map, {
  center: {lat: 52.51477270923461, lng: 13.39846691425174},
  zoom: 13,
  pixelRatio: window.devicePixelRatio || 1
// 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));

// Create the default UI components
var ui = H.ui.UI.createDefault(map, defaultLayers);

// Now use the map as required...
<!DOCTYPE html>
    <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>Change map style at runtime</title>
    <link rel="stylesheet" type="text/css" href="https://js.api.here.com/v3/3.1/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/v3/3.1/mapsjs-core.js"></script>
    <script type="text/javascript" src="https://js.api.here.com/v3/3.1/mapsjs-service.js"></script>
    <script type="text/javascript" src="https://js.api.here.com/v3/3.1/mapsjs-ui.js"></script>
    <script type="text/javascript" src="https://js.api.here.com/v3/3.1/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>Change map style at runtime</h1>
        <p>Change a style of the map feature when map is instantiated</p>
    <p>This example shows how to change map feature style during the map runtime. The map is loaded with the default "normal.map" style, after that
      the color of the features "landuse.park" and "landuse.builtup" is changed to the dark green and the dark grey accordingly. 
    <div id="map"></div>
    <p>The code below adds a <codeph>change</codeph> event listener to the instence of the <code>H.map.Style</code> associated with the
      layer's provider. Within this listener the section of the map style is extracted and modified and merged back to the original style.
      That results in the changed colors for the "landuse.park" and "landuse.builtup" map features.
    <script type="text/javascript" src='demo.js'></script>