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

Steps

Get the starter app

Select a type of authentication below and follow the steps to create a new application.

Set up authentication

Create developer credentials in your portal for the type of authentication you selected.

Set developer credentials

Use the API key or OAuth developer credentials so your application can access location services.

Update the basemap

A topographic basemap layer is typically used when displaying hiking trails.

1. Update the basemap layer to use arcgis/outdoor.

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       /* Use for API key authentication */
       const accessToken = "YOUR_ACCESS_TOKEN";
   
       // or
   
       /* Use for user authentication */
       // const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
       //   clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
       //   redirectUri: "YOUR_REDIRECT_URL", // The redirect URL registered in your OAuth credentials
       //   portal: "YOUR_PORTAL_URL" // Your portal URL
       // })
   
       // const accessToken = session.token;
       const map = L.map("map", {
         minZoom: 2
       }).setView([34.02, -118.805], 13);
   
       const basemapEnum = "arcgis/outdoor";
   
       L.esri.Vector.vectorBasemapLayer(basemapEnum, {
         token: accessToken
       }).addTo(map);
   

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Load a hiker icon

To use an image as an icon for point features, you use the Icon class. To style the trailheads from the Trailheads feature layer, reference the hiker icon URL.

1. Create a new Icon that references the hiker icon URL and specify the iconSize.

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       L.esri.Vector.vectorBasemapLayer(basemapEnum, {
         token: accessToken
       }).addTo(map);
   
       const hikerIcon = L.icon({
         iconUrl: "http://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png",
         iconSize: [18, 18]
       });
   
   

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Style trailheads (points)

Use the FeatureLayer and Marker classes to style and display trailheads.

1. Add a FeatureLayer. Set the url property to the Trailheads URL.

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       const hikerIcon = 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",
   
         })
         .addTo(map);
   

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2. Create a custom Marker at each trailhead location with pointToLayer. Set the marker's icon property to the hiker icon.

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       const hikerIcon = 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: hikerIcon
             });
           }
   
         })
         .addTo(map);
   

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3. Run the application to view hiker icons at the location of each trailhead.

Style trails (lines) by elevation gain

To visualize the elevation gain of a trail in the Trails (lines) feature layer, add a style definition that defines Path options.

1. Create a new Pane in the map by calling the createPane method.

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       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: hikerIcon
             });
           }
   
         })
         .addTo(map);
   
       map.createPane("trails");
   
   

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2. Add a FeatureLayer to the trails pane. Set the url property to the Trails URL.

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       map.createPane("trails");
   
       L.esri
         .featureLayer({
           url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0",
           pane: "trails",
   
         })
         .addTo(map);
   

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3. Define a style function to render the line features in magenta.

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       map.createPane("trails");
   
       L.esri
         .featureLayer({
           url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0",
           pane: "trails",
   
           style: (feature) => {
   
             return {
               color: "#BA55D3",
   
             };
           }
   
         })
         .addTo(map);
   

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4. Set the width of each trail feature dynamically based on its ELEV_GAIN property. The weight of the feature is determined by the width of the trail.

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       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",
   
               weight: width
   
             };
           }
   
         })
         .addTo(map);
   

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5. Run the app to view trails of differing widths based on elevation gain.

Display bike-friendly trails

You can style and display certain features, such as bike-friendly trails, by constructing a SQL query and a style definition in a new pane.

1. Create a new Pane in your map by calling the createPane method.

   More info

   Panes control the order in which layers render to the map. To change the ordering of a layer, get the pane containing the layer with getPane and set the pane's style.zIndex.

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       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",
   
               weight: width
   
             };
           }
   
         })
         .addTo(map);
   
       map.createPane("bikeTrails");
   
   

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2. Create a FeatureLayer. Set the url to the to the Trails URL and the pane to bikeTrails.

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       map.createPane("bikeTrails");
   
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         .featureLayer({
           url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0",
           pane: "bikeTrails",
   
         })
         .addTo(map);
   

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3. Set the where SQL clause to return the features that are bike-friendly.

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       map.createPane("bikeTrails");
   
       L.esri
         .featureLayer({
           url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0",
           pane: "bikeTrails",
   
           where: "USE_BIKE = 'YES'",
   
         })
         .addTo(map);
   

   Expand

4. Set the style to render the trails as dashed white lines.

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

   Expand

5. Run the app to view the locations of bike-friendly trails in relation to other hiking trails.

Style park areas (polygons)

You can define different style options for each unique attribute value. Add a style definition to render the polygon features from the Parks and Open Space feature layer with different colors based on the type of land they represent.

1. Add a FeatureLayer. Set the url property to the Parks and Open Space URL.

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

   Expand

2. Add a style that renders a different fillColor for each unique value of the TYPE field.

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       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

3. Run the app to view different park areas in different colors according to their type.

Run the app

Run the app.

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: