Style clusters

Style clusters and markers with L.DivIcon and L.MarkerClusterGroup options. More information about Feature Layers can be found in the L.esri.FeatureLayer documentation.

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<html>
  <head>
    <meta charset="utf-8" />
    <title>Styling clusters</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>
    <!-- Load Leaflet MarkerCluster and Esri Leaflet Cluster from CDN -->
    <link
      rel="stylesheet"
      type="text/css"
      href="https://unpkg.com/leaflet.markercluster@1.5.3/dist/MarkerCluster.Default.css"
      crossorigin=""
    />
    <link
      rel="stylesheet"
      type="text/css"
      href="https://unpkg.com/leaflet.markercluster@1.5.3/dist/MarkerCluster.css""
      crossorigin=""
    />
    <script
      src="https://unpkg.com/leaflet.markercluster@1.5.3/dist/leaflet.markercluster.js"
      crossorigin=""
    ></script>
    <script src="https://unpkg.com/esri-leaflet-cluster@3.0.1/dist/esri-leaflet-cluster.js"></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>
    <style>
      .cluster {
        background: #2d84c8;
        border-radius: 50%;
        text-align: center;
        color: white;
        font-weight: 700;
        border: 1px solid #2d84c8;
        font-family: monospace;
      }

      .cluster:before {
        content: " ";
        position: absolute;
        border-radius: 50%;
        z-index: -1;
        top: 1px;
        left: 1px;
        right: 1px;
        bottom: 1px;
        border: 1px solid white;
      }

      .digits-1 {
        font-size: 14px;
        height: 28px;
        width: 28px;
        line-height: 28px;
        margin-top: -14px;
        margin-left: -14px;
      }

      .digits-2 {
        font-size: 16px;
        height: 34px;
        width: 34px;
        line-height: 35px;
        margin-top: -17px;
        margin-left: -17px;
      }

      .digits-2:before {
        border-width: 2px;
      }

      .digits-3 {
        font-size: 18px;
        height: 48px;
        width: 47px;
        line-height: 47px;
        border-width: 3px;
        margin-top: -24px;
        margin-left: -24px;
      }

      .digits-3:before {
        border-width: 3px;
      }

      .digits-4 {
        font-size: 18px;
        height: 58px;
        width: 58px;
        line-height: 57px;
        border-width: 4px;
        margin-top: -29px;
        margin-left: -29px;
      }

      .digits-4:before {
        border-width: 4px;
      }
    </style>
    <div id="map"></div>
    <script>
      const accessToken = "YOUR_ACCESS_TOKEN";

      const map = L.map("map", {
        maxZoom: 18 // The clustering plugin needs to understand the map's maxZoom
      }).setView([0, 0], 2);

      L.esri.Vector.vectorBasemapLayer("arcgis/navigation-night", {
        token: accessToken
      }).addTo(map);

      // create a new cluster layer (new syntax at 2.0.0)
      const earthquakes = L.esri.Cluster.featureLayer({
        url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Earthquakes_Since1970/MapServer/0",
        spiderfyOnMaxZoom: false,
        removeOutsideVisibleBounds: true,
        disableClusteringAtZoom: 8,

        iconCreateFunction: function (cluster) {
          // this function defines how the icons
          // representing clusters are created
          // get the number of items in the cluster
          const count = cluster.getChildCount();

          // figure out how many digits long the number is
          const digits = (count + "").length;

          return L.divIcon({
            // Return a new L.DivIcon with our classes so we can
            // style them with CSS. Take a look at the CSS in
            // the head to see these styles. You have to set
            // iconSize to null if you want to use CSS to set the
            // width and height.
            html: count,
            className: "cluster digits-" + digits,
            iconSize: null
          });
        },
        pointToLayer: function (geojson, latlng) {
          // This function defines how individual markers
          // are created. You can see we are using the
          // value of the "magnitude" field to set the symbol
          const magnitude = geojson.properties.magnitude;
          let earthquakeSymbol = "";

          if (!magnitude) {
            earthquakeSymbol = "https://esri.github.io/esri-leaflet/img/earthquake-icon.png";
          } else if (magnitude <= 4.999) {
            earthquakeSymbol = "https://esri.github.io/esri-leaflet/img/yellow-triangle.png";
          } else if (magnitude >= 5 && magnitude <= 6.999) {
            earthquakeSymbol = "https://esri.github.io/esri-leaflet/img/orange-triangle.png";
          } else if (magnitude >= 7) {
            earthquakeSymbol = "https://esri.github.io/esri-leaflet/img/red-triangle.png";
          }

          const mapIcon = L.icon({
            iconUrl: earthquakeSymbol,
            iconSize: [20, 20]
          });

          return L.marker(latlng, {
            icon: mapIcon
          });
        }
      }).addTo(map);

      earthquakes.bindPopup(function (layer) {
        return L.Util.template("Magnitude <strong>{magnitude}</strong> earthquake", layer.feature.properties);
      });
    </script>
  </body>
</html>

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