Esri Leaflet
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Styling polygons

Custom styling of polygons with the style option. More information about Feature Layers can be found in the L.esri.FeatureLayer documentation.

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <title>Styling polygons</title>
  <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />

  <!-- Load Leaflet from CDN -->
  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css"
    integrity="sha512-xodZBNTC5n17Xt2atTPuE1HxjVMSvLVW9ocqUKLsCC5CXdbqCmblAshOMAS6/keqq/sMZMZ19scR4PsZChSR7A=="
    crossorigin=""/>
  <script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"
    integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA=="
    crossorigin=""></script>

  <!-- Load Esri Leaflet from CDN -->
  <script src="https://unpkg.com/esri-leaflet@3.0.8/dist/esri-leaflet.js"
    integrity="sha512-E0DKVahIg0p1UHR2Kf9NX7x7TUewJb30mxkxEm2qOYTVJObgsAGpEol9F6iK6oefCbkJiA4/i6fnTHzM6H1kEA=="
    crossorigin=""></script>

  <!-- Load Esri Leaflet Vector from CDN -->
  <script src="https://unpkg.com/esri-leaflet-vector@3.1.3/dist/esri-leaflet-vector.js"
    integrity="sha512-2sbebld2cAnzUw4nloopGcKE7AGl7xUlCXg8amUWS47veGTKMH6tx1VsT7U9ukwXPAVzecigXK0jMtS5UcllDg=="
    crossorigin=""></script>

  <style>
    body { margin:0; padding:0; }
    #map { position: absolute; top:0; bottom:0; right:0; left:0; }
  </style>
</head>
<body>

<div id="map"></div>

<script>
  var map = L.map('map').setView([33.836, -118.22], 8);

  L.esri.Vector.vectorBasemapLayer('ArcGIS:LightGray', {
    apikey: apiKey // Replace with your API key - https://developers.arcgis.com
  }).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>