This sample displays a real-time data feed from a service published using the GeoEvent extension for ArcGIS Server using a WebSocket. In addition to Esri Leaflet, it relies on Esri Leaflet Stream.
<html>
<head>
<meta charset="utf-8" />
<title>Display a stream layer</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@4.2.3/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>
<script src="https://unpkg.com/esri-leaflet-stream@1.0.0/dist/esri-leaflet-stream.min.js"></script>
<div id="map"></div>
<script type="text/javascript">
const apiKey = "YOUR_API_KEY";
const map = L.map("map").setView([33.982735, -118.333152], 12);
L.esri.Vector.vectorBasemapLayer("arcgis/dark-gray/base", {
apikey: apiKey
}).addTo(map);
function createRandomFill() {
return "#" + ((Math.random() * 0xffffff) << 0).toString(16);
}
L.esri
.streamFeatureLayer({
url: "https://geoeventsample1.esri.com:6443/arcgis/rest/services/LABus/StreamServer",
pointToLayer: function (geojson, latlng) {
return L.circleMarker(latlng, {
fillColor: createRandomFill(),
fillOpacity: 0.8,
color: "#cccccc",
weight: 2
});
}
})
.addTo(map);
</script>
</body>
</html>