Simplify complex features

You can simplify complex features for faster response times. Zoom in to watch as higher resolution vectors are loaded from the . 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@3.0.14/dist/esri-leaflet.js"></script>

    <!-- Load Esri Leaflet Vector from CDN -->
    <script src="https://unpkg.com/esri-leaflet-vector@4.2.7/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>

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