Style heat map gradients with the Heatmap feature layer plugin.
<html>
<head>
<meta charset="utf-8" />
<title>Style a heat map</title>
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no" />
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" crossorigin="" />
<script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" crossorigin=""></script>
<!-- Load Esri Leaflet from CDN -->
<script src="https://unpkg.com/esri-leaflet@3.0.12/dist/esri-leaflet.js"></script>
<!-- Load Esri Leaflet Vector from CDN -->
<script src="https://unpkg.com/esri-leaflet-vector@4.2.5/dist/esri-leaflet-vector.js" crossorigin=""></script>
<style>
html,
body,
#map {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
font-family: Arial, Helvetica, sans-serif;
font-size: 14px;
color: #323232;
}
</style>
</head>
<body>
<!-- Include Leaflet.heat from CDN -->
<script src="https://unpkg.com/leaflet.heat@0.2.0/dist/leaflet-heat.js"></script>
<!-- Load Heatmap Feature Layer from CDN -->
<script src="https://unpkg.com/esri-leaflet-heatmap@2.0.0"></script>
<div id="map"></div>
<script>
const accessToken = "YOUR_ACCESS_TOKEN";
const map = L.map("map", {
maxZoom: 16 // the heatmap plugin needs some help understanding the map's maxZoom
}).setView([41.759, -88.157], 12);
L.esri.Vector.vectorBasemapLayer("arcgis/light-gray", {
token: accessToken
}).addTo(map);
// new constructor syntax at 2.0.0
L.esri.Heat.featureLayer({
url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/CommunityAddressing/MapServer/0",
radius: 10,
gradient: {
0.2: "#ffffb2",
0.4: "#fd8d3c",
0.6: "#fd8d3c",
0.8: "#f03b20",
1: "#bd0026"
}
}).addTo(map);
</script>
</body>
</html>