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Basic clustering

Description

This sample demonstrates how to enable featureReduction (e.g. clustering) on a FeatureLayer. This is handled via the featureReduction constructor option, or the setFeatureReduction() method.

Support for feature reduction is limited to the following scenarios:

  • The map must have a spatial reference of Web Mercator or WGS84.
  • FeatureLayer or CSVLayer with point geometries fewer than 50,000 features.
  • FeatureLayer created from a service URL must point to a service that supports pagination.
  • When editing is initiated with the Editor widget, then feature reduction is disabled until the Editor widget is destroyed.

Code

<!DOCTYPE html>
<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no"/>
<title>Basic clustering on FeatureLayer</title>

<link rel="stylesheet" href="https://js.arcgis.com/3.46/esri/css/esri.css">
<script src="https://js.arcgis.com/3.46/"></script>

<style>
  html
, body, #viewDiv {
    height
: 100%;
    width
: 100%;
    margin
: 0;
    padding
: 0;
 
}

 
#infoDiv{
    top
: 0px;
    right
: 0px;
    position
: absolute;
    z
-index: 2;
    opacity
: 0.9;
    background
-color: whitesmoke;
    padding
: 8px;
    font
-family: Verdana, Geneva, Arial, Helvetica, sans-serif;
    font
-size: 12px;
 
}
</style>

<script>
  require
([
   
"esri/map",
   
"esri/layers/FeatureLayer",
   
"esri/dijit/PopupTemplate",
   
"esri/dijit/Legend",
   
"dojo/domReady!"
 
], function(Map, FeatureLayer, PopupTemplate, Legend
 
) {

   
var map = new Map("viewDiv", {
      basemap
: "dark-gray-vector",
      center
: [ -73.92872, 40.71321 ],
      zoom
: 11
   
});

   
// Enable clustering in the layer's constructor
   
// and add the layer to the map

   
var serviceUrl = "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/nyc_parks_gardens_hist_sites/FeatureServer/0";
   
var layer = new FeatureLayer(serviceUrl, {
      outFields
: [ "facname", "proptype", "factype", "address" ],
      featureReduction
: {
        type
: "cluster"
     
},
      infoTemplate
: new PopupTemplate({
        title
: "{facname}",
        description
: "{proptype} {factype} on {address}."
     
})
   
});
    map
.addLayer(layer);

    map
.on("load", function(evt){
     
var legend = new Legend({
        map
: map,
        layerInfos
: [{
          layer
: layer,
          title
: "Parks and historic sites"
       
}]
     
}, "legendDiv");
      legend
.startup();
   
});

 
});

</script>

</head>

<body>
 
<div id="viewDiv"></div>
 
<div id="infoDiv">
   
<div id="legendDiv"></div>
 
</div>
</body>

</html>
 
         
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