Style polygons

Add a custom style to polgyon features using the style option from the L.esri.FeatureLayer class. For more explanation, visit the Style a feature layer tutorial.

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<html>
  <head>
    <meta charset="utf-8" />
    <title>Style polygons</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@3.1.3/dist/esri-leaflet-vector.js" crossorigin=""></script>
    <script>
    </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>
    <div id="map"></div>
    <script>
      const apiKey = "YOUR_API_KEY";

      const map = L.map("map").setView([33.836, -118.22], 8);

      L.esri.Vector.vectorBasemapLayer("ArcGIS:LightGray", {
        apikey: apiKey
      }).addTo(map);

      L.esri
        .featureLayer({
          url: "https://services.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/USA_Congressional_Districts/FeatureServer/0",
          simplifyFactor: 0.5,
          precision: 5,
          style: function (feature) {
            if (feature.properties.PARTY === "Democrat") {
              return { color: "blue", weight: 2 };
            } else if (feature.properties.PARTY === "Republican") {
              return { color: "red", weight: 2 };
            } else {
              return { color: "white", weight: 2 };
            }
          }
        })
        .addTo(map);
    </script>
  </body>
</html>

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