Display a stream layer

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.

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<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@1.8.0/dist/leaflet.css" crossorigin="" />
    <script src="https://unpkg.com/leaflet@1.8.0/dist/leaflet.js" crossorigin=""></script>
    <!-- Load Esri Leaflet from CDN -->
    <script src="https://unpkg.com/esri-leaflet@^3.0.8/dist/esri-leaflet.js"></script>
    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@4.0.0/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:DarkGray: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>

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