datamap2.js

function initMap() {
  var infoWindow = new google.maps.InfoWindow();
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 12,
    mapTypeId:google.maps.MapTypeId.HYBRID,
    scrollwheel: true,
    center: { lat: 41.876, lng: -87.624 }
   });

   var georssLayer = new google.maps.KmlLayer({
    url: 'datamap.kml'
   });
   georssLayer.setMap(map);

  function addMarker(feature, i, info) {
    var marker = new google.maps.Marker({
      position: feature.position,
      label: {text: feature.title, color: "yellow"},
      animation:google.maps.Animation.BOUNCE,
      map: map
    });

    google.maps.event.addListener(marker, 'click', (function(marker, i) {
      return function() {
        infoWindow.setPosition(feature.position);
        infoWindow.setContent(info[i]);
        infoWindow.open(map, marker);
      }
    })(marker, i));
    //console.log(info[i]);
  }

/*
  function addOption(feature, i) {
    var name = 'marker ' + i;
    var option = '<option value="'+ i +'">' + name + '</option>';
    document.getElementById('dropdown').innerHTML += option;
  }
*/
  function addOption(feature, i) {
    var option = '<option value="'+ i +'">' + feature.title + '</option>';
    document.getElementById('dropdown').innerHTML += option;
  }

  function selectOpion(selectElm) {
    var i = Number(selectElm.value);
    map.setCenter(features[i].position);
    map.setZoom(9);
  }

  google.maps.event.addDomListener(document.getElementById('dropdown'), 'change', function(e) {
    selectOpion(this);
  });

  var features = [
    {position: new google.maps.LatLng(1.5252265, 101.7205939), title: 'Place Name 0'},
    {position: new google.maps.LatLng(-0.4938175, 101.47658145000001), title: 'Place Name 1'},
    {position: new google.maps.LatLng(0.32034099999999993, 101.06136349999998), title: 'Place Name 2'},
    {position: new google.maps.LatLng(1.68450545, 101.4448306), title: 'Place Name 3'},
    {position: new google.maps.LatLng(0.5137912, 101.441176), title: 'Place Name 4'},
    {position: new google.maps.LatLng(-0.49255899999999997, 102.24846645), title: 'Place Name 5'},
    {position: new google.maps.LatLng(-0.293274, 103.18415300000001), title: 'Place Name 6'},
    {position: new google.maps.LatLng(0.16251709999999997, 102.43564895), title: 'Place Name 7'},
    {position: new google.maps.LatLng(2.0708884499999995, 100.80535549999999), title: 'Place Name 8'},
    {position: new google.maps.LatLng(0.8932599499999999, 100.49054645), title: 'Place Name 9'},
    {position: new google.maps.LatLng(0.828033, 101.90484455), title: 'Place Name 10'}
  ];

  var infoWindowContent = [];
  for (var i = 0, feature; feature = features[i]; i++) {
    infoWindowContent.push('<div class=info_content><h2>'+feature.title+'</h2><p>Di Sini Info Tentang '+feature.title+'</p></div>');
  };

  for (var i = 0, feature; feature = features[i]; i++) {
    addMarker(feature, i, infoWindowContent);
    addOption(feature, i);
  }
}