Tutorial: Change language labels

Learn how to change language labels for styled basemap tiles.

The ArcGIS Static Basemap Tiles serviceThe ArcGIS Static Basemap Tiles service, also known as the Static Basemap Tiles service, is a location service that provides basemap data as pre-rendered and pre-styled map tiles for the world. It supports key styles in the ArcGIS Basemap style family. An ArcGIS Location Platform account is required to use the services.Learn more provides access to raster basemap tiles for the world. The service supports a number of ArcGIS styles such as navigation, streets, outdoor, and light-gray. The tiles are returned as PNG files.

In this tutorial, you use the dropdown menu to toggle between different languages for the static basemap tiles.

Prerequisites

Steps

Get the starter app

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

Set up authentication

Set developer credentials

Get a Cesium ion access token

All Cesium applications must use an access token provided through Cesium ion. This token allows you to access assets such as Cesium World Terrain in your application.

1. Go to your Cesium ion dashboard to generate an access token. Copy the key to your clipboard.

2. Create a cesiumAccessToken variable and replace YOUR_CESIUM_ACCESS_TOKEN with the access token you copied from the Cesium ion dashboard.

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       <script>
   
       /* 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_URI", // The redirect URL registered in your OAuth credentials
       //   portal: "YOUR_PORTAL_URL" // Your portal URL
       // })
   
       // const accessToken = session.token;
   
       Cesium.ArcGisMapService.defaultAccessToken = accessToken;
   
       const cesiumAccessToken = "YOUR_CESIUM_ACCESS_TOKEN";
   
       </script>
   

3. Configure Cesium.Ion.defaultAccessToken with the Cesium access token to validate the application.

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       <script>
   
       /* 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_URI", // The redirect URL registered in your OAuth credentials
       //   portal: "YOUR_PORTAL_URL" // Your portal URL
       // })
   
       // const accessToken = session.token;
   
       Cesium.ArcGisMapService.defaultAccessToken = accessToken;
   
       const cesiumAccessToken = "YOUR_CESIUM_ACCESS_TOKEN";
   
       Cesium.Ion.defaultAccessToken = cesiumAccessToken;
   
       </script>
   

Add a language selector

Add a menu that allows users to change the display language of your map. CesiumJS does not have a built-in selector widget, so you will create an HTML <select> element.

1. In the <body> element, add a select element, which you will populate in a later step.

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     <body>
       <div id="cesiumContainer"></div>
   
       <div id="language-wrapper">
         <select id="language"></select>
       </div>
   
     </body>
   

2. In the <head> tag, add CSS that will position the <select> menu element and its wrapper in the upper right corner and provide styling.

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       <style>
       html,
       body,
       #cesiumContainer {
         margin: 0;
         padding: 0;
         width: 100%;
         height: 100%;
       }
   
   
       #language-wrapper {
         position: absolute;
         top: 20px;
         left: 20px;
         background: rgba(255, 255, 255, 0);
       }
   
       #language {
         font-size: 16px;
         padding: 4px 8px;
       }
   
   
       </style>
   

Update the camera's viewpoint

1. Change the camera's destination to 8.20, 46.90, 300000. This will focus the camera on Switzerland.

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       viewer.camera.setView({
   
         destination: Cesium.Cartesian3.fromDegrees(8.20, 46.90, 250000)
   
       });
   

Set the basemap language

When the scene loads, initialize the app to display the basemap in English.

1. Create a function called url that takes a language as a parameter. This will create the URL of the static basemap tiles for that specified language.

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       const basemapEnum = "arcgis/navigation";
       const baseUrl = "https://static-map-tiles-api.arcgis.com/arcgis/rest/services/static-basemap-tiles-service/v1";
   
       const url = (language) => `${baseUrl}/${basemapEnum}/static/tile/{z}/{y}/{x}?token=${accessToken}&language=${language}`;
   
   

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2. Create a defaultLanguage variable for the basemap, which is en for English.

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       const basemapEnum = "arcgis/navigation";
       const baseUrl = "https://static-map-tiles-api.arcgis.com/arcgis/rest/services/static-basemap-tiles-service/v1";
   
       const url = (language) => `${baseUrl}/${basemapEnum}/static/tile/{z}/{y}/{x}?token=${accessToken}&language=${language}`;
   
       const defaultLanguage = "en";
   

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3. Import arcgisRest.request() to make a request to the Static Basemap Tiles service. This dynamically fetches the available basemap languages and populates the select element.

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       <!-- ArcGIS REST JS -->
       <script src="https://unpkg.com/@esri/arcgis-rest-request@4/dist/bundled/request.umd.js"></script>
   
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       const selector = document.querySelector("#language");
   
       arcgisRest.request(`${baseUrl}/self`, {
         httpMethod: "GET",
         authentication: arcgisRest.ApiKeyManager.fromKey(accessToken)
       }).then((response) => {
         response.languages.forEach((language) => {
           const option = document.createElement("option");
           option.value = language.code;
           option.textContent = language.name;
           selector.appendChild(option);
         });
       });
   

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4. Fetch the service URL to retrieve the basemap JSON. Then, create an UrlTemplateImageryProvider object from the JSON.

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       arcgisRest.request(`${baseUrl}/${basemapEnum}/static`, {
         httpMethod: "GET",
         authentication: arcgisRest.ApiKeyManager.fromKey(accessToken)
       }).then((data) => {
   
         const imageryProvider = new Cesium.UrlTemplateImageryProvider({
           url: url(defaultLanguage),
           tileHeight: 512,
   
         });
   
       });
   

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5. Remove the basemap attribution code because you will add it dynamically instead in the next step.

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         fetch(`${baseUrl}?token=${accessToken}`)
           .then((response) => response.json())
           .then((data) => {
             const basemapAttribution = new Cesium.Credit(data.copyrightText, false);
             viewer.creditDisplay.addStaticCredit(basemapAttribution);
           });
   

6. Create a basemapCredit and instantiate a Credit object from the copyrightText string of the JSON. CesiumJS does not provide attribution automatically for Static Basemap Tiles serviceThe ArcGIS Static Basemap Tiles service, also known as the Static Basemap Tiles service, is a location service that provides basemap data as pre-rendered and pre-styled map tiles for the world. It supports key styles in the ArcGIS Basemap style family. An ArcGIS Location Platform account is required to use the services.Learn more. Therefore, you are required to add this attribution manually.

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       let basemapCredit;
   
       const selector = document.querySelector("#language");
   
       arcgisRest.request(`${baseUrl}/self`, {
         httpMethod: "GET",
         authentication: arcgisRest.ApiKeyManager.fromKey(accessToken)
       }).then((response) => {
         response.languages.forEach((language) => {
           const option = document.createElement("option");
           option.value = language.code;
           option.textContent = language.name;
           selector.appendChild(option);
         });
       });
   
       arcgisRest.request(`${baseUrl}/${basemapEnum}/static`, {
         httpMethod: "GET",
         authentication: arcgisRest.ApiKeyManager.fromKey(accessToken)
       }).then((data) => {
   
         basemapCredit = data.copyrightText;
   
         const imageryProvider = new Cesium.UrlTemplateImageryProvider({
           url: url(defaultLanguage),
           tileHeight: 512,
   
           credit: basemapCredit
   
         });
   
       });
   

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7. Add the imageryProvider to the viewer.

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       arcgisRest.request(`${baseUrl}/${basemapEnum}/static`, {
         httpMethod: "GET",
         authentication: arcgisRest.ApiKeyManager.fromKey(accessToken)
       }).then((data) => {
   
         basemapCredit = data.copyrightText;
   
         const imageryProvider = new Cesium.UrlTemplateImageryProvider({
           url: url(defaultLanguage),
           tileHeight: 512,
   
           credit: basemapCredit
   
         });
   
         viewer.imageryLayers.addImageryProvider(imageryProvider);
   
       });
   

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8. Run the code to ensure that the <select> element contains different language enumerations.

Add an event listener

1. Add an event listener for the selector.

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       selector.addEventListener("change", (e) => {
   
       });
   

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2. Create a new UrlTemplateImageryProvider using the selected language.

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       selector.addEventListener("change", (e) => {
   
         const newImageryProvider = new Cesium.UrlTemplateImageryProvider({
           url: url(e.target.value),
           tileWidth: 512,
           tileHeight: 512,
           credit: basemapCredit
         });
   
       });
   

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3. Update the viewer with the new language.

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       selector.addEventListener("change", (e) => {
   
         const newImageryProvider = new Cesium.UrlTemplateImageryProvider({
           url: url(e.target.value),
           tileWidth: 512,
           tileHeight: 512,
           credit: basemapCredit
         });
   
         viewer.imageryLayers.removeAll();
         viewer.imageryLayers.addImageryProvider(newImageryProvider);
   
       });
   

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Run the app

Run the app.

The map should be displayed in English and you should be able to use the controls to switch between language labels.

What's next?

Learn how to use additional location services in these tutorials: