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Basic clustering
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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/3.29/esri/css/esri.css">
<script src="https://js.arcgis.com/3.29/"></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>