Display a pop-up

Learn how to display feature attributes in a pop-up.

A pop-up, also known as a "popup", is a visual element that displays information about a feature when it is clicked. You typically style and configure a pop-up using HTML and CSS for each layer in a map. Pop-ups can display attribute values, calculated values, or rich content such as images, charts, or videos.

In this tutorial, you create an interactive pop-up for the Trailheads feature layer in the Santa Monica Mountains. When a feature is clicked, a pop-up is displayed containing the name of the trail and the service that manages it.

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 resources 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. Copy the API key access token to your clipboard when prompted.

3. In CodePen, update the accessToken variable to use your access token.

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         const map = L.map("map", {
           minZoom: 2
         })
   
         map.setView([34.02, -118.805], 13);
   
         const accessToken = "YOUR_ACCESS_TOKEN";
   
         const basemapEnum = "arcgis/streets";
   
         L.esri.Vector.vectorBasemapLayer(basemapEnum, {
           token: accessToken
         }).addTo(map);
   

To learn about the other types of authentication available, go to Types of authentication.

Add the trailheads layer

Use the FeatureLayer class to display the Trailheads layer on your map.

1. Create a FeatureLayer and set the url property to access the feature service.

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         L.esri.Vector.vectorBasemapLayer(basemapEnum, {
           token: accessToken
         }).addTo(map);
   
         var trailheads = L.esri
           .featureLayer({
             url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads_Styled/FeatureServer/0"
           })
           .addTo(map);
   

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Display a pop-up

Use the bindPopup method to display the attribute information of the trailheads layer.

1. Append the bindPopup method to the trailheads layer and pass in a function to return the attribute information of the layer.

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         var trailheads = L.esri
           .featureLayer({
             url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads_Styled/FeatureServer/0"
           })
           .addTo(map);
   
         trailheads.bindPopup(function (layer) {
   
         });
   

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2. Set the pop-up contents to display information about the trail and park name.

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         var trailheads = L.esri
           .featureLayer({
             url: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads_Styled/FeatureServer/0"
           })
           .addTo(map);
   
         trailheads.bindPopup(function (layer) {
   
           return L.Util.template("<b>{TRL_NAME}</b><br>{PARK_NAME}</br>", layer.feature.properties);
   
         });
   

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Run the app

In CodePen, run your code to display the map.

The map view should display the Trailheads feature layer. When you click a feature, the name of the trailhead and its park name is displayed in a pop-up.

What's next?

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