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.
<!DOCTYPE html> <html lang="en"> <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@3.0.19/dist/esri-leaflet.js"></script> <!-- Load Esri Leaflet Vector from CDN --> <script src="https://unpkg.com/esri-leaflet-vector@4.3.2/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> const accessToken = "YOUR_ACCESS_TOKEN"; const map = L.map("map").setView([33.982735, -118.333152], 12); L.esri.Vector.vectorBasemapLayer("arcgis/dark-gray/base", { token: accessToken }).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>