Style a feature layer

Learn how to use data-driven styling to apply symbol colors and styles to feature layers.

A feature layer is a dataset in a feature service hosted in ArcGIS. Each feature layer contains features with a single geometry type (point, line, or polygon), and a set of attributes.

In this tutorial, you apply different styles to enhance the visualization of the Trailheads, Trails and Parks and Open Spaces feature layers.

Prerequisites

You need an ArcGIS account to access the developer dashboard and create an API key.

Steps

Create a new pen

  1. To get started, either complete the Display a map tutorial or .

Set the API key

To access location services, you need an API key or OAuth 2.0 access token. To learn how to create and scope your key, visit the Create an API key tutorial.

  1. Go to your dashboard to get an API key. The API key must be scoped to access the services used in this tutorial.

  2. In CodePen, update apiKey to use your key.

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          const apiKey = "YOUR_API_KEY";
          const basemapEnum = "ArcGIS:Streets";
    
          const map = L.map("map", {
            minZoom: 2
          }).setView([34.02, -118.805], 13);
    
          L.esri.Vector.vectorBasemapLayer(basemapEnum, {
            apiKey: apiKey
          }).addTo(map);
    

Add code to style layers

Add the following code to style the Trailheads, Trails and Parks and Open Spaces feature layers:

  • Add Trailheads with hiking icons.
  • Add Trails and style the width and color of the lines.
  • Add Trails again to show bike-only trails.
  • Add Parks and Open Spaces classified by type of park.
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      // Style trailheads (points)
      const icon = L.icon({
        iconUrl: "http://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png",
        iconSize: [18, 18]
      });

      const trailheads = L.esri
        .featureLayer({
          url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0",
          pointToLayer: (geojson, latlng) => {
            return L.marker(latlng, {
              icon: icon
            });
          }
        })
        .addTo(map);

      // Style trails (lines)
      map.createPane("trails");
      L.esri
        .featureLayer({
          url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0",
          pane: "trails",
          style: (feature) => {
            const width = 3 + (4 * feature.properties.ELEV_GAIN) / 2300;
            return {
              color: "#BA55D3",
              width: width
            };
          }
        })
        .addTo(map);

      // Style bike-only trails (lines)
      map.createPane("bikeTrails");
      L.esri
        .featureLayer({
          url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0",
          where: "USE_BIKE = 'YES'",
          pane: "bikeTrails",
          style: () => {
            return {
              color: "#FFFFFF",
              dashArray: "2, 3",
              dashOffset: "2",
              weight: "1.5"
            };
          }
        })
        .addTo(map);

      // Style open spaces (polygons)
      L.esri
        .featureLayer({
          url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0",
          style: (feature) => {
            let style = {
              color: null // no outline color
            };
            if (feature.properties.TYPE === "Natural Areas") {
              style.fillColor = "#9E559C";
            } else if (feature.properties.TYPE === "Regional Open Space") {
              style.fillColor = "#A7C636";
            } else if (feature.properties.TYPE === "Local Park") {
              style.fillColor = "#149ECE";
            } else {
              style.fillColor = "#ED5151";
            }

            return style;
          }
        })
        .addTo(map);
Expand

Run the app

In CodePen, run your code to display the map.

You should now see the styled trailheads, trails, and parks layers.

What's next?

Learn how to use additional ArcGIS location services in these tutorials:

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