Display a map | OpenLayers

Learn how to use OpenLayersOpenLayers is an Open Source JavaScript library used to make interactive maps.Learn more to display a mapA map is a collection of layers that are displayed in 2D. It is typically composed of a basemap layer and data layers.Learn more.

Display a map using API key authentication

A map contains layersA layer is a reference to a collection of geographic data that is used to access and display data. The data for layers are typically provided by the basemap layer service and data services.Learn more of geographic data. A map contains a basemap layerA basemap layer is the layer in a map or scene that displays basemap data. The data source for a basemap layer is typically a basemap service.Learn more and, optionally, one or more data layersA data layer is a layer that references geographic data from a file or a service and is used to visualize the data in a map or scene.Learn more. You can display a specific area of a map by using a map viewA map view is a user interface that displays map layers and graphics in 2D. It controls the area (extent) of the map that is visible and supports user interactions such as pan and zoom.Learn more and setting the locationA location is a position or region (point, line, or polygon) on the earth's surface.Learn more and zoom levelZoom level is a value that sets the scale for a map view or a scene view.Learn more.

In this tutorial, display a map of the world with the arcgis/outdoor basemap style.

This application will use the basemap tiles usage model .

Prerequisites

You need an ArcGIS Location Platform or ArcGIS Online account.

Steps

Create a new app

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

Choose API key authentication if you:

Want the easiest way to get started.
Want to build public applicationsA public application is an application that allows anonymous access without requiring users to sign in with an ArcGIS account. It supports API key or app authentication.Learn more that access ArcGIS Location ServicesArcGIS Location Services, also referred to as Location Services, are services hosted by Esri that provide geospatial functionality for developing mapping applications. They include the ArcGIS Basemap Styles service, ArcGIS Static Basemap Tiles service, ArcGIS Places service, ArcGIS Geocoding service, ArcGIS Routing service, ArcGIS GeoEnrichment service, and ArcGIS Elevation service. An ArcGIS Location Platform or ArcGIS Online account is required to use the services.Learn more and secure itemsAn item, also known as a content item, is a resource stored in a portal such as a web map, hosted layer, style, script tool, file, or notebook.Learn more.
Have an ArcGIS Location Platform or ArcGIS Online account.

Choose user authentication if you:

Want to build private applications.
Require application users to sign in with their own ArcGIS accountAn ArcGIS account is an identity with a user type and set of privileges that can access specific ArcGIS products, tools, APIs, services, and resources. The main account types that can be used for development are an ArcGIS Location Platform account, ArcGIS Online account, and ArcGIS Enterprise account. ArcGIS Location Platform and ArcGIS Online accounts are also associated with a subscription.Learn more and access resources their behalf.
Have an ArcGIS Online account.

To learn more about both types of authentication, go to Authentication.

Go to CodePen and create a new pen for your application.

In CodePen > HTML, add HTML and CSS to create a page with a div element called map.

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<!DOCTYPE html>
<html lang="en">

  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
    <title>OpenLayers Tutorials: Display a map</title>

    <style>
    html,
    body,
    #map {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
      font-family: Arial, Helvetica, sans-serif;
      font-size: 14px;
      color: #323232;
    }
    </style>

  </head>

  <body>
    <div id="map"></div>

  </body>

</html>

Download the user authentication starter app.
Unzip the folder and open it in a text editor of your choice, such as Visual Studio Code. The starter app includes the following:
- callback.html: This contains callback as part of the authentication process.
- index.html: This contains app logic and the OAuth 2.0 code necessary to perform the authentication.

In the index.html, add a div element called map.

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  <body>

    <div id="map"></div>

Apply CSS styling to the map div.

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    html,
    body,

    #map {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
      font-family: Arial, Helvetica, sans-serif;
      font-size: 14px;
      color: #323232;
    }

Set up authentication

Create a new API key credentialAPI key credentials are an item that contains the parameters used to create and manage long-lived access tokens for API key authentication. They are a type of developer credential.Learn more with the correct privileges to get an access token.

Go to the Create an API key tutorial and create an API keyAn API key is a long-lived access token created using API key credentials. They are valid for up to one year and are typically embedded directly into client applications.Learn more with the following privilege(s)Privileges are a set of permissions assigned to ArcGIS accounts, developer credentials, and applications that grant access to secure resources and functionality in ArcGIS.Learn more:
- Privileges
  - Location services > Basemaps

Create a new OAuth credentialOAuth credentials are an item that contains parameters required to implement user authentication or app authentication, including a client_id, client_secret, and redirect URIs. They are a type of developer credential.Learn more to register the application.

Go to the Create OAuth credentials for user authentication tutorial to create an OAuth credential.
Copy the Client ID and Redirect URL from your OAuth credentials item and paste them to a safe location. They will be used in a later step.

Set developer credentials

Use the access token created in the previous step in your application.

Add a <script> element in the HTML <body> and create an accessToken variable to store your access tokenAn access token is an authorization string that provides access to secure ArcGIS content, data, and services. Its capabilities are determined by the privileges it supports. It is obtained by implementing API key authentication, User authentication, or App authentication.Learn more. Set YOUR_ACCESS_TOKEN with the access token you previously copied from your API key credentialsAPI key credentials are an item that contains the parameters used to create and manage long-lived access tokens for API key authentication. They are a type of developer credential.Learn more.
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    <script>

    /* Use for API key authentication */
    const accessToken = "YOUR_ACCESS_TOKEN";

    </script>
```
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Use the OAuth credentials created in the previous step in your application.

In both the index.html and callback.html files, set the properties of clientId and redirectUri with the client ID and redirect URL of your OAuth credentialsOAuth credentials are an item that contains parameters required to implement user authentication or app authentication, including a client_id, client_secret, and redirect URIs. They are a type of developer credential.Learn more.

index.html
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    /* Use for user authentication */
    const clientId = "YOUR_CLIENT_ID"; // Your client ID from OAuth credentials
    const redirectUri = ""YOUR_REDIRECT_URI""; // The redirect URL registered in your OAuth credentials
    const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
      clientId,
      redirectUri,
      portal: "https://www.arcgis.com/sharing/rest" // Your portal URL
    });

    const accessToken = session.token;

callback.html
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    arcgisRest.ArcGISIdentityManager.completeOAuth2({
      clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
      redirectUri: "YOUR_REDIRECT_URI", // The redirect URL registered in your OAuth credentials
      portal: "https://www.arcgis.com/sharing/rest" // Your portal URL
    });

Run the app and ensure you can sign in successfully.

If you are unable to sign in, make sure you have the correct redirect URL and port. This URL varies based on your application and typically takes the format of https://<server>[:port]/callback.html or http://my-arcgis-app:/auth. For example, if you are running an application on http://127.0.0.1:5500/, set http://127.0.0.1:5500/callback.html as your redirect URL in the index.html and callback.html file and your developer credential. They all have to match!

Add script references

You will need add <script> and <link> tags to load the JavaScript and CSS files for OpenLayers and ol-mapbox-style.

In the index.html file, add the following <link> and <script> references if they are missing.

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    <style>
    html,
    body,
    #map {
      padding: 0;
      margin: 0;
      height: 100%;
      width: 100%;
      font-family: Arial, Helvetica, sans-serif;
      font-size: 14px;
      color: #323232;
    }
    </style>

    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/ol@v10.9.0/ol.css">
    <script src="https://cdn.jsdelivr.net/npm/ol@v10.9.0/dist/ol.js"></script>

    <script src="https://cdn.jsdelivr.net/npm/ol-mapbox-style@13.4.1/dist/olms.js"></script>

Create a map

Use the Map and View classes to create an OpenLayers map.

The OpenLayers Map class displays the contents of the map and provides a user interface to interact with it. It supports clicking, zooming, panning, rotating, and tilting the perspective of the map. It also lets you interact with the visible contents of the map data, for example finding features at the mouse cursor. You can also use it to modify the data displayed by adding new sources or changing layer properties. OpenLayers takes care of automatically re-rendering as needed in response to changes made to layers.

For further details, see the OpenLayers documentation.

Use the Map class to create the map with options to control its display and behavior. Set the target property to "map", which is the id of the div element.

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    const map = new ol.Map({ target: "map" });
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Create a View, and use setView to apply it to the map. To center the map view, set the center property to -20, 30 and the zoom property to 3.

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    map.setView(
      new ol.View({
        center: ol.proj.fromLonLat([-20, 30]),
        zoom: 3
      })
    );
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Add a basemap layer

OpenLayers does not directly support a vector basemap or a vector style file, so you will use the openlayers-mapbox-style (olms) JavaScript library to load a Mapbox style from the ArcGIS Basemap Styles service and render it with OpenLayers.

The Mapbox style is JSON file that contains a reference to the vector tile layers used in the style, and visual styling rules to apply to one or more data layers in those tiles.

Create a basemapId variable and set it to arcgis/outdoor.

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    const basemapId = "arcgis/outdoor";

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Construct the basemap URL based on basemapId and your API key.

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    const basemapId = "arcgis/outdoor";

    const basemapURL = `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapId}?token=${accessToken}`;

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Use olms to apply the basemap style to your map. The olms function takes two inputs, the map element and the URL for a basemap layer.

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    const basemapId = "arcgis/outdoor";

    const basemapURL = `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapId}?token=${accessToken}`;

    olms.apply(map, basemapURL)

      });
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Add attribution

You need to display EsriEsri attribution is the requirement to display "Powered by Esri" text in all applications that use Esri technology including ArcGIS Maps SDKs, APIs, content, or services.Learn more and data attributionData attribution is the requirement to display the names of data source providers in all applications when accessing ArcGIS content, layers, or services.Learn more in all applications that use Esri technology. OpenLayers displays data attribution automatically for the Basemap Styles serviceThe ArcGIS Basemap Styles service, also referred to as the Basemap Styles service, is a location service that provides basemap styles and data for the world. It returns styles as Mapbox styles and web maps, and data as vector tiles and/or map tiles. It supports all of the styles in the ArcGIS Basemap style and Open Basemap style family. An ArcGIS Location Platform or ArcGIS Online account is required to use the service.Learn more, however, you need to take additional steps to display Esri attributionEsri attribution is the requirement to display "Powered by Esri" text in all applications that use Esri technology including ArcGIS Maps SDKs, APIs, content, or services.Learn more ("Powered by Esri").

Add a load event handler to the olms function call. Inside, retrieve the basemap source and use setAttributions() to prepend Powered by Esri.

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    const basemapId = "arcgis/outdoor";

    const basemapURL = `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapId}?token=${accessToken}`;

    olms.apply(map, basemapURL)

      .then(() => {
        // Add Esri attribution
        // Learn more in https://esriurl.com/attribution
        const source = map.getLayers().item(0).getSource();
        const poweredByEsriString = "Powered by <a href='https://www.esri.com/en-us/home' target='_blank'>Esri</a> | ";

        const attributionFn = source.getAttributions();
        if (attributionFn) {
          source.setAttributions((ViewStateLayerStateExtent) => {
            return [poweredByEsriString, ...attributionFn(ViewStateLayerStateExtent)];
          });
        } else source.setAttributions(poweredByEsriString);

      });
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