Add a custom style to polgyon features using the style option from the L.esri.Feature class. For more explanation, visit the Style a feature layer tutorial.
<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@1.9.4/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@3.0.10/dist/esri-leaflet.js"></script>
<!-- Load Esri Leaflet Vector from CDN -->
<script src="https://unpkg.com/esri-leaflet-vector@4.2.3/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/light-gray", {
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>