Tutorial: Display a GeoJSON 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 customize the interactive pop-up created by CesiumJS for the Trailheads feature service in the Santa Monica Mountains. When a feature is clicked, a pop-up will display containing the name of the trail and the service that manages it.

Prerequisites

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

Steps

Create a new pen

To get started, either complete the Display a scene 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.

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

In CodePen, update apiKey to use your key. Update cesiumAccessToken to use your Cesium ion access token.

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      const apiKey = "YOUR_API_KEY";

      Cesium.ArcGisMapService.defaultAccessToken = apiKey;

      const cesiumAccessToken = "YOUR_CESIUM_ACCESS_TOKEN";

      Cesium.Ion.defaultAccessToken = cesiumAccessToken;

      const arcGisImagery = Cesium.ArcGisMapServerImageryProvider.fromBasemapType(Cesium.ArcGisBaseMapType.SATELLITE);

      const viewer = new Cesium.Viewer("cesiumContainer", {

        baseLayer: Cesium.ImageryLayer.fromProviderAsync(arcGisImagery),

      });

Add references to ArcGIS REST JS

In the <head> element, reference the feature-service and request packages from ArcGIS REST JS.

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    <script src="https://cesium.com/downloads/cesiumjs/releases/1.107/Build/Cesium/Cesium.js"></script>
    <link href="https://cesium.com/downloads/cesiumjs/releases/1.107/Build/Cesium/Widgets/widgets.css" rel="stylesheet">

    <script src="https://unpkg.com/@esri/arcgis-rest-request@4.0.0/dist/bundled/request.umd.js"></script>
    <script src="https://unpkg.com/@esri/arcgis-rest-feature-service@4.0.0/dist/bundled/feature-service.umd.js"></script>

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Add the trailheads layer

Use arcgisRest.queryFeatures to query the Trailheads URL and add features to the scene as GeoJSON.

In the <body>, create an arcgisRest.ApiKeyManager using your API key to authenticate requests to the feature service.

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    const apiKey = "YOUR_API_KEY";

    Cesium.ArcGisMapService.defaultAccessToken = apiKey;

    const authentication = arcgisRest.ApiKeyManager.fromKey(apiKey);
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Use arcgisRest.queryFeatures to make an authenticated request to the Trailheads feature service. Set the f property to geojson to format the response as GeoJSON.

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      destination : Cesium.Cartesian3.fromDegrees(-118.705, 33.957, 35000),
      orientation : {
        heading : Cesium.Math.toRadians(0.0),
        pitch : Cesium.Math.toRadians(-70.0),
      }

    });

    const trailheadsURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0";

    arcgisRest.queryFeatures({
        url: trailheadsURL,
        authentication,
        f:"geojson"
    }).then((response) => {

    })
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Load the features into your scene using a GeoJsonDataSource

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    const trailheadsURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0";

    arcgisRest.queryFeatures({
        url: trailheadsURL,
        authentication,
        f:"geojson"
    }).then((response) => {

        Cesium.GeoJsonDataSource.load(response,{
            clampToGround:true,
            markerColor: Cesium.Color.fromCssColorString('#5491f5'),
        }).then((data)=>{
            viewer.dataSources.add(data);
        })

    })
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Customize the pop-up

Cesium automatically creates popups for GeoJSON layers using the properties of each feature. You can set the title and description properties of each feature to customize the popup content.

Access the GeoJSON response from arcgisRest.queryFeatures and iterate through each feature. Set the title property of each trailhead to the trail name (TRL_NAME).

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    const trailheadsURL = "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0";

    arcgisRest.queryFeatures({
        url: trailheadsURL,
        authentication,
        f:"geojson"
    }).then((response) => {

        for (let i=0; i<response.features.length; i++) {
            let feature = response.features[i];
            feature.properties.title = feature.properties.TRL_NAME;

        }

        Cesium.GeoJsonDataSource.load(response,{
            clampToGround:true,
            markerColor: Cesium.Color.fromCssColorString('#5491f5'),
        }).then((data)=>{
            viewer.dataSources.add(data);
        })

    })
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Set the description property of each trailhead to include additional feature attributes.

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        for (let i=0; i<response.features.length; i++) {
            let feature = response.features[i];
            feature.properties.title = feature.properties.TRL_NAME;

            feature.properties.description = `<b>${feature.properties.PARK_NAME}</b><br>
            Zip code: ${feature.properties.ZIP_CODE}<br>
            Elevation: ${feature.properties.ELEV_FT}ft`

        }
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Run the app

In CodePen, run your code to display the map.

You should see the trailheads feature layer represented as points in the scene. Click on a trailhead to open a pop-up that displays information about it.

What's next?

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

Style features

Use data-driven styling to apply symbol colors and styles to features.

Query features (SQL)

Execute a SQL query to access polygon features from a feature service.

Search for an address

Find an address or place using a search box and the geocoding service.