Simplify complex features

You can simplify complex features for faster response times. Zoom in to watch as higher resolution vectors are loaded from the service. Hover over features to display the zipcode and city name. To learn more about L.esri.FeatureLayer, visit the API reference.

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<html>
  <head>
    <meta charset="utf-8" />
    <title>Simplify complex features</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>
    <style>
      #info-pane {
        position: absolute;
        top: 10px;
        right: 10px;
        z-index: 400;
        padding: 1em;
        background: white;
      }
    </style>
    <div id="map"></div>
    <div id="info-pane" class="leaflet-bar">Hover to Inspect</div>
    <script>
      const accessToken = "YOUR_ACCESS_TOKEN";

      const map = L.map("map").setView([37.75, -122.23], 9);

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

      const zipcodes = L.esri
        .featureLayer({
          url: "https://services.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/USA_ZIP_Codes/FeatureServer/0",
          simplifyFactor: 0.35,
          precision: 5,
          fields: ["FID", "ZIP", "PO_NAME"],
          style: {
            color: "#A9A9A9",
            weight: 1
          }
        })
        .addTo(map);

      let oldId;

      zipcodes.on("mouseout", function (e) {
        document.getElementById("info-pane").innerHTML = "Hover to Inspect";
        zipcodes.resetFeatureStyle(oldId);
      });

      zipcodes.on("mouseover", function (e) {
        oldId = e.layer.feature.id;
        document.getElementById("info-pane").innerHTML = e.layer.feature.properties.ZIP + " " + e.layer.feature.properties.PO_NAME;
        zipcodes.setFeatureStyle(e.layer.feature.id, {
          color: "#9D78D2",
          weight: 3,
          opacity: 1
        });
      });
    </script>
  </body>
</html>