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HTML

              
                <html>

<head>
	<meta charset="utf-8" />
	<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />

	<!--
     ArcGIS API for JavaScript, https://js.arcgis.com
     For more information about the featurereduction-cluster sample,
     read the original sample description at developers.arcgis.com.
     https://developers.arcgis.com/javascript/latest/sample-code/featurereduction-cluster/index.html
     -->
	<title>
		Point clustering - basic configuration | Sample | ArcGIS API for
		JavaScript 4.16
	</title>
	<link rel="stylesheet" href="https://js.arcgis.com/4.16/esri/themes/dark-blue/main.css" />
	<script src="https://js.arcgis.com/4.16/"></script>
</head>

<body>
	<div id="viewDiv"></div>
	<div id="infoDiv" class="esri-widget">
		<button id="cluster" class="esri-button">Disable Clustering</button>
		<div id="legendDiv"></div>
		<div id="sliderDiv"></div>
	</div>
</body>

</html>
              
            
!

CSS

              
                html,
body,
#viewDiv {
	padding: 0;
	margin: 0;
	height: 100%;
	width: 100%;
	background: rgba(50, 50, 50);
}
#infoDiv {
	padding: 10px;
}

#sliderDiv {
	width: 500px;
}

              
            
!

JS

              
                require([
	"esri/Map",
	"esri/layers/FeatureLayer",
	"esri/layers/GeoJSONLayer",
	"esri/views/MapView",
	"esri/widgets/Legend",
	"esri/widgets/Expand",
	"esri/widgets/Home",
	"esri/widgets/Slider"
], function (
	Map,
	FeatureLayer,
	GeoJSONLayer,
	MapView,
	Legend,
	Expand,
	Home,
	Slider
) {
	// Configures clustering on the layer. A cluster radius
	// of 100px indicates an area comprising screen space 100px
	// in length from the center of the cluster
	const clusterConfig = {
		type: "cluster",
		clusterRadius: "100px",
		// {cluster_count} is an aggregate field containing
		// the number of features comprised by the cluster
		popupTemplate: {
			content: "This cluster represents {cluster_count} earthquakes.",
			fieldInfos: [
				{
					fieldName: "cluster_count",
					format: {
						places: 0,
						digitSeparator: true
					}
				}
			]
		},
		clusterMinSize: "24px",
		clusterMaxSize: "60px",
		labelingInfo: [
			{
				deconflictionStrategy: "none",
				labelExpressionInfo: {
					expression: "Text($feature.cluster_count, '#,###')"
				},
				symbol: {
					type: "text",
					color: "#004a5d",
					font: {
						weight: "bold",
						family: "Noto Sans",
						size: "12px"
					}
				},
				labelPlacement: "center-center"
			}
		]
	};

	const layer = new GeoJSONLayer({
		title: "Earthquakes from the last month",
		url:
			"https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson",
		copyright: "USGS Earthquakes",
		featureReduction: clusterConfig,
		// popupTemplates can still be viewed on
		// individual features
		popupTemplate: {
			title: "Earthquake Info",
			content: "Magnitude {mag} {type} hit {place} on {time}",
			fieldInfos: [
				{
					fieldName: "time",
					format: {
						dateFormat: "short-date-short-time"
					}
				}
			]
		},
		renderer: {
			type: "simple",
			field: "mag",
			symbol: {
				type: "simple-marker",
				size: 4,
				color: "#69dcff",
				outline: {
					color: "rgba(0, 139, 174, 0.5)",
					width: 5
				}
			}
		}
	});

	// background layer for geographic context
	// projected to Alaska Polar Stereographic
	const baseLayer = new FeatureLayer({
		portalItem: {
			id: "2b93b06dc0dc4e809d3c8db5cb96ba69"
		},
		legendEnabled: false,
		popupEnabled: false,
		renderer: {
			type: "simple",
			symbol: {
				type: "simple-fill",
				color: [65, 65, 65, 1],
				outline: {
					color: [50, 50, 50, 0.75],
					width: 0.5
				}
			}
		},
		spatialReference: {
			wkid: 5936
		}
	});

	const map = new Map({
		layers: [baseLayer, layer]
	});

	const view = new MapView({
		container: "viewDiv",
		extent: {
			spatialReference: {
				wkid: 5936
			},
			xmin: 1270382,
			ymin: -1729511,
			xmax: 2461436,
			ymax: -953893
		},
		spatialReference: {
			// WGS_1984_EPSG_Alaska_Polar_Stereographic
			wkid: 5936
		},
		constraints: {
			minScale: 15469455
		},
		map: map
	});

	const slider = new Slider({
		container: "sliderDiv",
		min: 100,
		max: 1000,
		values: [200],
		snapOnClickEnabled: false,
		visibleElements: {
			labels: true,
			rangeLabels: true
		}
	});

	slider.on("thumb-drag", ({ value, state }) => {
		if (state !== "stop") return;
		const fr = layer.featureReduction.clone();
		fr.clusterRadius = value;
		layer.featureReduction = fr;
	});

	view.ui.add(slider, "bottom-right");

	view.ui.add(
		new Home({
			view: view
		}),
		"top-left"
	);

	const legend = new Legend({
		view: view,
		container: "legendDiv"
	});

	const infoDiv = document.getElementById("infoDiv");
	view.ui.add(
		new Expand({
			view: view,
			content: infoDiv,
			expandIconClass: "esri-icon-layer-list",
			expanded: false
		}),
		"top-left"
	);

	const toggleButton = document.getElementById("cluster");

	// To turn off clustering on a layer, set the
	// featureReduction property to null
	toggleButton.addEventListener("click", function () {
		let fr = layer.featureReduction;
		layer.featureReduction = fr && fr.type === "cluster" ? null : clusterConfig;
		toggleButton.innerText =
			toggleButton.innerText === "Enable Clustering"
				? "Disable Clustering"
				: "Enable Clustering";
	});
});

              
            
!
999px

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