Google MarkerClusterer: decluster markers below a certain zoom level?
var markerClusterer = new MarkerClusterer(map, myMarkers, {
maxZoom: 15,
zoomOnClick: false
});
//zoom 0 corresponds to a map of the Earth fully zoomed out, 20 is closeup
//markerCluster goes away after zoom
//turn off zoom on click or spiderfy won't work
Setting the maxZoom level on this example, declusters all the markers for zoom level 8 and above.
(working version of example with valid key, original example in github is from before key was required)
To reproduce:
- set Max zoom level to 7
- click refresh map
- change the zoom level to 0 (the furthest out)
- 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/[email protected]/images/people35.png',
height: 35,
width: 35,
anchor: [16, 0],
textColor: '#ff00ff',
textSize: 10
}, {
url: 'https://cdn.jsdelivr.net/npm/[email protected]/images/people45.png',
height: 45,
width: 45,
anchor: [24, 0],
textColor: '#ff0000',
textSize: 11
}, {
url: 'https://cdn.jsdelivr.net/npm/[email protected]/images/people55.png',
height: 55,
width: 55,
anchor: [32, 0],
textColor: '#ffffff',
textSize: 12
}],
[{
url: 'https://cdn.jsdelivr.net/npm/[email protected]/images/conv30.png',
height: 27,
width: 30,
anchor: [3, 0],
textColor: '#ff00ff',
textSize: 10
}, {
url: 'https://cdn.jsdelivr.net/npm/[email protected]/images/conv40.png',
height: 36,
width: 40,
anchor: [6, 0],
textColor: '#ff0000',
textSize: 11
}, {
url: 'https://cdn.jsdelivr.net/npm/[email protected]/images/conv50.png',
width: 50,
height: 45,
anchor: [8, 0],
textSize: 12
}],
[{
url: 'https://cdn.jsdelivr.net/npm/[email protected]/images/heart30.png',
height: 26,
width: 30,
anchor: [4, 0],
textColor: '#ff00ff',
textSize: 10
}, {
url: 'https://cdn.jsdelivr.net/npm/[email protected]/images/heart40.png',
height: 35,
width: 40,
anchor: [8, 0],
textColor: '#ff0000',
textSize: 11
}, {
url: 'https://cdn.jsdelivr.net/npm/[email protected]/images/heart50.png',
width: 50,
height: 44,
anchor: [12, 0],
textSize: 12
}],
[{
url: 'https://cdn.jsdelivr.net/npm/[email protected]/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;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<!-- scr -- ipt src="https://googlemaps.github.io/js-marker-clusterer/examples/data.json"></scr -- ipt -->
<script src="https://unpkg.com/@google/[email protected]/dist/markerclustererplus.min.js"></script>
<h3>An example of MarkerClusterer v3</h3>
<div id="map-container">
<div id="map"></div>
</div>
<div id="inline-actions">
<span>Max zoom level:
<select id="zoom">
<option value="-1">Default</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
</select>
</span>
<span class="item">Cluster size:
<select id="size">
<option value="-1">Default</option>
<option value="40">40</option>
<option value="50">50</option>
<option value="70">70</option>
<option value="80">80</option>
</select>
</span>
<span class="item">Cluster style:
<select id="style">
<option value="-1">Default</option>
<option value="0">People</option>
<option value="1">Conversation</option>
<option value="2">Heart</option>
<option value="3">Pin</option>
</select>
<input id="refresh" type="button" value="Refresh Map" class="item"/>
<a href="#" id="clear">Clear</a>
</div>