• JavaScript
  • HTML
                  
                  

function findNearestMarker(coords) {
  var minDist = 1000,
    nearest_text = '*None*',
    markerDist,
    // get all objects added to the map
    objects = map.getObjects(),
    len = map.getObjects().length,
    i;

  // iterate over objects and calculate distance between them
  for (i = 0; i < len; i += 1) {
    markerDist = objects[i].getGeometry().distance(coords);
    if (markerDist < minDist) {
      minDist = markerDist;
      nearest_text = objects[i].getData();
    }
  }

  logEvent('The nearest marker is: ' + nearest_text);
}

function addClickEventListenerToMap(map) {
  // add 'tap' listener
  map.addEventListener('tap', function (evt) {
    var coords =  map.screenToGeo(evt.currentPointer.viewportX, evt.currentPointer.viewportY);
    findNearestMarker(coords);
  }, false);
}

/**
 * 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: 60.1697, lng:24.8292},
  zoom: 16,
  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));

// Step 4: create custom logging facilities
var logContainer = document.createElement('ul');
logContainer.className ='log';
logContainer.innerHTML = '
  • Try clicking on the map
  • '; map.getElement().appendChild(logContainer); // Helper for logging events function logEvent(str) { var entry = document.createElement('li'); entry.className = 'log-entry'; entry.textContent = str; logContainer.insertBefore(entry, logContainer.firstChild); } // Set up five markers. var coords = [{ lat:60.1697, lng:24.8292}, { lat: 60.1704, lng: 24.8285 }, { lat: 60.1709, lng: 24.8277 }, { lat: 60.1700, lng: 24.8265 }, { lat:60.1700, lng: 24.8283}]; //Create the svg mark-up var svgMarkup = '' + '' + '${REPLACE}'; coords.forEach(function (value, index) { var myIcon = new H.map.Icon(svgMarkup.replace('${REPLACE}', index + 1)), marker = new H.map.Marker(value, { icon: myIcon, volatility: true }); // add custom data to the marker marker.setData(index + 1); // set draggable attribute on the marker so it can recieve drag events marker.draggable = true; map.addObject(marker); }); // simple D'n"D implementation for markers"' map.addEventListener('dragstart', function(ev) { var target = ev.target; if (target instanceof H.map.Marker) { behavior.disable(); } }, false); map.addEventListener('drag', function(ev) { var target = ev.target, pointer = ev.currentPointer; if (target instanceof H.map.Marker) { target.setGeometry(map.screenToGeo(pointer.viewportX, pointer.viewportY)); } }, false); map.addEventListener('dragend', function(ev) { var target = ev.target; if (target instanceof H.map.Marker) { behavior.enable(); } }, false); // Add the click event listener. addClickEventListenerToMap(map);
                      
                      
    <!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>Finding the Nearest Marker</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>
        <style type="text/css">
          .log {
            position: absolute;
            top: 5px;
            left: 5px;
            height: 150px;
            width: 250px;
            overflow: scroll;
            background: white;
            margin: 0;
            padding: 0;
            list-style: none;
            font-size: 12px;
          }
          .log-entry {
            padding: 5px;
            border-bottom: 1px solid #d0d9e9;
          }
          .log-entry:nth-child(odd) {
              background-color: #e1e7f1;
          }
        </style>
      <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>Finding the Nearest Marker</h1>
            <p>Find a marker nearest to the click location</p>
        </div>
        <p>Click anywhere on the Map to find out which of the five Markers is the nearest to that spot. You can also drag and drop any Marker to a new position.</p>
        <div id="map"></div>
        <h3>Code</h3>
        <p>Examples demonstrates how to calculate distance between two geo points and employs simple marker drag and drop implementation.</p>
        <script type="text/javascript" src='demo.js'></script>
      </body>
    </html>