Esri Leaflet

Styling polygons

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

<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@1.5.1/dist/leaflet.css"
  integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
  crossorigin=""/>
  <script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js"
  integrity="sha512-GffPMF3RvMeYyc1LWMHtK8EbPv0iNZ8/oTtHPx9/cc2ILxQ+u905qIwdpULaqDkyBKgOaB57QTMg7ztg8Jm2Og=="
  crossorigin=""></script>


  <!-- Load Esri Leaflet from CDN -->
  <script src="https://unpkg.com/esri-leaflet@2.3.1/dist/esri-leaflet.js"
  integrity="sha512-Np+ry4Dro5siJ1HZ0hTwn2jsmu/hMNrYw1EIK9EjsEVbDge4AaQhjeTGRg2ispHg7ZgDMVrSDjNrzH/kAO9Law=="
  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.basemapLayer('Gray').addTo(map);
  L.esri.basemapLayer('GrayLabels').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>