Google MarkerClusterer: decluster markers below a certain zoom level?

Question

I\'m using Google MarkerClusterer. I\'d like to decluster all the markers whenever the map goes above zoom level 15.

There is a maxZoom setting in the

Answer 1

Setting the maxZoom level on this example, declusters all the markers for zoom level 8 and above.

To reproduce:

1. set Max zoom level to 7
2. click refresh map
3. change the zoom level to 0 (the furthest out)
4. click the "+" on the zoom slider 8 times.

The documentation for MarkerClustererPlus is a little clearer:

maxZoom | number | The maximum zoom level at which clustering is enabled or null if clustering is to be enabled at all zoom levels. The default value is null.

code snippet:

var styles = [
  [{
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/people35.png',
    height: 35,
    width: 35,
    anchor: [16, 0],
    textColor: '#ff00ff',
    textSize: 10
  }, {
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/people45.png',
    height: 45,
    width: 45,
    anchor: [24, 0],
    textColor: '#ff0000',
    textSize: 11
  }, {
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/people55.png',
    height: 55,
    width: 55,
    anchor: [32, 0],
    textColor: '#ffffff',
    textSize: 12
  }],
  [{
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/conv30.png',
    height: 27,
    width: 30,
    anchor: [3, 0],
    textColor: '#ff00ff',
    textSize: 10
  }, {
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/conv40.png',
    height: 36,
    width: 40,
    anchor: [6, 0],
    textColor: '#ff0000',
    textSize: 11
  }, {
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/conv50.png',
    width: 50,
    height: 45,
    anchor: [8, 0],
    textSize: 12
  }],
  [{
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/heart30.png',
    height: 26,
    width: 30,
    anchor: [4, 0],
    textColor: '#ff00ff',
    textSize: 10
  }, {
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/heart40.png',
    height: 35,
    width: 40,
    anchor: [8, 0],
    textColor: '#ff0000',
    textSize: 11
  }, {
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/heart50.png',
    width: 50,
    height: 44,
    anchor: [12, 0],
    textSize: 12
  }],
  [{
    url: 'https://cdn.jsdelivr.net/npm/marker-clusterer-plus@2.1.4/images/pin.png',
    height: 48,
    width: 30,
    anchor: [-18, 0],
    textColor: '#ffffff',
    textSize: 10,
    iconAnchor: [15, 48]
  }]
];

var markerClusterer = null;
var map = null;
var imageUrl = 'http://chart.apis.google.com/chart?cht=mm&chs=24x32&' +
  'chco=FFFFFF,008CFF,000000&ext=.png';

function refreshMap(data) {
  if (markerClusterer) {
    markerClusterer.clearMarkers();
  }

  var markers = [];

  var markerImage = new google.maps.MarkerImage(imageUrl,
    new google.maps.Size(24, 32));

  for (var i = 0; i < data.photos.length; ++i) {
    var latLng = new google.maps.LatLng(data.photos[i].latitude,
      data.photos[i].longitude)
    var marker = new google.maps.Marker({
      position: latLng,
      draggable: true,
      icon: markerImage
    });
    markers.push(marker);
  }

  var zoom = parseInt(document.getElementById('zoom').value, 10);
  var size = parseInt(document.getElementById('size').value, 10);
  var style = parseInt(document.getElementById('style').value, 10);
  zoom = zoom === -1 ? null : zoom;
  size = size === -1 ? null : size;
  style = style === -1 ? null : style;

  markerClusterer = new MarkerClusterer(map, markers, {
    maxZoom: zoom,
    gridSize: size,
    styles: styles[style],
    imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'
  });
}

function initialize() {
  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 2,
    center: new google.maps.LatLng(39.91, 116.38),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  });

  var refresh = document.getElementById('refresh');
  google.maps.event.addDomListener(refresh, 'click', refreshMap);

  var clear = document.getElementById('clear');
  google.maps.event.addDomListener(clear, 'click', clearClusters);

  $.getJSON("https://api.myjson.com/bins/6ad78", function(data, textStatus, jqXHR) {
    console.log(textStatus);
    refreshMap(data);
  });
}

function clearClusters(e) {
  e.preventDefault();
  e.stopPropagation();
  markerClusterer.clearMarkers();
}

google.maps.event.addDomListener(window, 'load', initialize);

body {
  margin: 0;
  padding: 10px 20px 20px;
  font-family: Arial;
  font-size: 16px;
}

#map-container {
  padding: 6px;
  border-width: 1px;
  border-style: solid;
  border-color: #ccc #ccc #999 #ccc;
  -webkit-box-shadow: rgba(64, 64, 64, 0.5) 0 2px 5px;
  -moz-box-shadow: rgba(64, 64, 64, 0.5) 0 2px 5px;
  box-shadow: rgba(64, 64, 64, 0.1) 0 2px 5px;
  width: 800px;
}

#map {
  width: 800px;
  height: 400px;
}

#actions {
  list-style: none;
  padding: 0;
}

#inline-actions {
  padding-top: 10px;
}

.item {
  margin-left: 20px;
}

An example of MarkerClusterer v3

  



  Max zoom level:
        
          Default
          7
          8
          9
          10
          11
          12
          13
          14
        

      
  Cluster size:
        
          Default
          40
          50
          70
          80
        
      
  Cluster style:
        
          Default
          People
          Conversation
          Heart
          Pin
       
       
       Clear