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:
<!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>