Style a feature layer

Learn how to use renderers to apply data-driven styling to feature layers.

A feature layer is a dataset in a hosted feature service. Each feature layer contains features with a single geometry type (point, line, or polygon), and a set of attributes. Feature layers can be styled on the client-side with a renderer. Renderers are responsible for using attribute values to apply the appropriate symbol to each feature when the layer is drawn. Renderers can be used with visual variables and expressions to create more complex, data-driven visualizations.

In this tutorial, you will use three different renderers to style three hosted feature layers.

Prerequisites

Steps

Create a new pen

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

Get an access token

You need an access token with the correct privileges to access the location services used in this tutorial.

1. Go to the Create an API key tutorial and create an API key with the following privilege(s):
   
   • Privileges
     • Location services > Basemaps
   • Item access
     • Note: If you are using your own custom data layer for this tutorial, you need to grant the API key credentials access to the layer item. Learn more in Item access privileges.
2. In CodePen, set esriConfig.apiKey to your access token.
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     var esriConfig = {
       apiKey: "YOUR_ACCESS_TOKEN"
     };
   

To learn about other ways to get an access token, go to Types of authentication.

Add modules

1. In the require statement, add the FeatureLayer module.

   More info

   The ArcGIS Maps SDK for JavaScript is available as AMD modules and ES modules, but this tutorial is based on AMD. The AMD require function uses references to determine which modules will be loaded – for example, you can specify "esri/layers/FeatureLayer" for loading the FeatureLayer module. After the modules are loaded, they are passed as parameters (e.g. FeatureLayer) to the callback function where they can be used in your application. It is important to keep the module references and callback parameters in the same order. To learn more about the API's different modules visit the Overview Guide page.

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       require([
         "esri/config",
         "esri/Map",
         "esri/views/MapView",
   
         "esri/layers/FeatureLayer"
   
       ], function(esriConfig, Map, MapView, FeatureLayer ) {
   

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Style trailheads (points)

Use the SimpleRenderer, PictureMarkerSymbol, and LabelClass classes to style the points with an image, and then define label attributes to display for the Trailheads feature layer.

1. Create a trailheadsRenderer and define it as a simple renderer. Set the symbol property to draw a hiker image accessed from its url.

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         const view = new MapView({
           container: "viewDiv",
           map: map,
           center: [-118.80543,34.02700], //Longitude, latitude
           zoom: 13
         });
   
         const trailheadsRenderer = {
           "type": "simple",
           "symbol": {
             "type": "picture-marker",
             "url": "http://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png",
             "width": "18px",
             "height": "18px"
           }
         }
   

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2. Create a trailheadsLabels and set the symbol property to draw a label with the TRL_NAME.

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         const trailheadsRenderer = {
           "type": "simple",
           "symbol": {
             "type": "picture-marker",
             "url": "http://static.arcgis.com/images/Symbols/NPS/npsPictograph_0231b.png",
             "width": "18px",
             "height": "18px"
           }
         }
   
         const trailheadsLabels = {
           symbol: {
             type: "text",
             color: "#FFFFFF",
             haloColor: "#5E8D74",
             haloSize: "2px",
             font: {
               size: "12px",
               family: "Noto Sans",
               style: "italic",
               weight: "normal"
             }
           },
   
           labelPlacement: "above-center",
           labelExpressionInfo: {
             expression: "$feature.TRL_NAME"
           }
         };
   
   

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3. Create a trailheads FeatureLayer. Set the url property to access its URL endpoint. Set the renderer and labelingInfo before adding trailheads to the map. The feature layer will autocast the renderer and labelingInfo to create class instances of the objects.

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           labelPlacement: "above-center",
           labelExpressionInfo: {
             expression: "$feature.TRL_NAME"
           }
         };
   
         // Create the layer and set the renderer
         const trailheads = new FeatureLayer({
           url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0",
           renderer: trailheadsRenderer,
           labelingInfo: [trailheadsLabels]
         });
   
         map.add(trailheads);
   

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4. View hiker symbols with trailhead names.

Style trails (lines)

Use the SimpleRenderer and VisualVariable classes to style trails in the Trails feature layer. Visual variables define the attribute to use to style trails with a greater elevation gain wider compared to trails with smaller elevation changes. This is one form of data-driven visualization.

1. Create a trailsRenderer and define it as a simple renderer.

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         map.add(trailheads);
   
         // Define a unique value renderer and symbols
         const trailsRenderer = {
           type: "simple",
           symbol: {
             color: "#BA55D3",
             type: "simple-line",
             style: "solid"
           },
   
   

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2. In the visualVariables array, set the field to ELEV_GAIN to determine line width.

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         // Define a unique value renderer and symbols
         const trailsRenderer = {
           type: "simple",
           symbol: {
             color: "#BA55D3",
             type: "simple-line",
             style: "solid"
           },
   
           visualVariables: [
             {
               type: "size",
               field: "ELEV_GAIN",
               minDataValue: 0,
               maxDataValue: 2300,
               minSize: "3px",
               maxSize: "7px"
             }
           ]
         };
   
   

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3. Create a trails FeatureLayer. Set the url to access its URL endpoint. Set the renderer and opacity properties before adding trails to the map. The feature layer will autocast the renderer a create class instances of the object.

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           visualVariables: [
             {
               type: "size",
               field: "ELEV_GAIN",
               minDataValue: 0,
               maxDataValue: 2300,
               minSize: "3px",
               maxSize: "7px"
             }
           ]
         };
   
         // Create the layer and set the renderer
         const trails = new FeatureLayer({
           url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0",
           renderer: trailsRenderer,
           opacity: 0.75
         });
   
         // Add the layer
         map.add(trails,0);
   

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4. View trails of differing widths based on elevation gain.

Show bike-only trails (lines)

You can use a renderer and definition expression to style a subset of data from a feature layer. To style bike-only trails from the Trails feature layer, use the definitionExpression, SimpleRenderer and SimpleLineSymbol classes. The layer is added on top of the existing trails layer.

1. Create a bikeTrailsRenderer and define it as a simple renderer. Set the symbol to draw a line that is styled with dots in pink.

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         // Add the layer
         map.add(trails,0);
   
         // Add bikes only trails
         const bikeTrailsRenderer = {
           type: "simple",
           symbol: {
             type: "simple-line",
             style: "short-dot",
             color: "#FF91FF",
             width: "1px"
           }
         };
   

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2. Create a bikeTrails FeatureLayer and set the url and renderer properties. Set the definitionExpression (a SQL where clause) to access bike trails from the Trails feature layer before adding bikeTrails to the map. The feature layer will autocast the renderer a create class instances of the object.

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         // Add bikes only trails
         const bikeTrailsRenderer = {
           type: "simple",
           symbol: {
             type: "simple-line",
             style: "short-dot",
             color: "#FF91FF",
             width: "1px"
           }
         };
   
         const bikeTrails = new FeatureLayer({
           url:
             "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trails/FeatureServer/0",
           renderer: bikeTrailsRenderer,
           definitionExpression: "USE_BIKE = 'YES'"
         });
   
         map.add(bikeTrails, 1);
   

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3. View the location of bike trails in relation to other trails.

Style open spaces (polygons)

You can use renderers to style feature layer data by unique attribute values. Use the UniqueValueRenderer and SimpleFillSymbol classes to style polygon features with different fill colors, based on the TYPE attribute in the Parks and Open Spaces feature layer.

1. Create a createFillSymbol function with value and color as parameters. The function will return a solid, simple-fill symbol for each park type.

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         map.add(bikeTrails, 1);
   
         // Add parks with a class breaks renderer and unique symbols
         function createFillSymbol(value, color) {
           return {
             "value": value,
             "symbol": {
               "color": color,
               "type": "simple-fill",
               "style": "solid",
               "outline": {
                 "style": "none"
               }
             },
             "label": value
           };
         }
   
   

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2. Create an openSpacesRenderer and define it as unique-value. Set the field property to TYPE. In the uniqueValueInfos array, set unique colors for each park type.

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         // Add parks with a class breaks renderer and unique symbols
         function createFillSymbol(value, color) {
           return {
             "value": value,
             "symbol": {
               "color": color,
               "type": "simple-fill",
               "style": "solid",
               "outline": {
                 "style": "none"
               }
             },
             "label": value
           };
         }
   
         const openSpacesRenderer = {
           type: "unique-value",
           field: "TYPE",
           uniqueValueInfos: [
             createFillSymbol("Natural Areas", "#9E559C"),
             createFillSymbol("Regional Open Space", "#A7C636"),
             createFillSymbol("Local Park", "#149ECE"),
             createFillSymbol("Regional Recreation Park", "#ED5151")
           ]
         };
   
   

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3. Create an openspaces FeatureLayer. Set the url to access its URL endpoint. Set the renderer and opacity properties before adding openspacesto the map. The feature layer will autocast the renderer to create class instances of the object.

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         const openSpacesRenderer = {
           type: "unique-value",
           field: "TYPE",
           uniqueValueInfos: [
             createFillSymbol("Natural Areas", "#9E559C"),
             createFillSymbol("Regional Open Space", "#A7C636"),
             createFillSymbol("Local Park", "#149ECE"),
             createFillSymbol("Regional Recreation Park", "#ED5151")
           ]
         };
   
         // Create the layer and set the renderer
         const openspaces = new FeatureLayer({
           url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Parks_and_Open_Space/FeatureServer/0",
           renderer: openSpacesRenderer,
           opacity: 0.2
         });
   
         // Add the layer
         map.add(openspaces,0);
   

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Run the app

In CodePen, run your code to display the map.

The completed map should display all of the layers with a unique, data-driven style.

What's next?

Learn how to use additional API features and ArcGIS services in these tutorials:

• Display a pop-up
• Import data as a feature layer
• Create a web map
• Display a webmap