Change the basemap style

Learn how to change a basemap style in a map using the basemap styles service.

The basemap styles service provides a number basemap layer styles such as topography, streets, outdoor, navigation, and imagery that you can use in maps.

In this tutorial, you use a <select> dropdown menu with ol-mapbox-style to toggle between a number of different basemap layer styles.

Prerequisites

You need an ArcGIS Location Platform or ArcGIS Online account.

Steps

Create a new pen

To get started, either complete the Display a map tutorial or .

Get an access token

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

Go to the Create an API key tutorial and create an API key with the following privilege(s):
- Privileges
  - Location services > Basemaps
Copy the API key access token to your clipboard when prompted.

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

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const accessToken = "YOUR_ACCESS_TOKEN";
const basemapId = "arcgis/streets";
const basemapURL = `https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles/${basemapId}?token=${accessToken}`;
olms.apply(map, basemapURL);

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

Remove basemap references

Remove the basemapId, basemapURL, and the olms function.

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    <script>

      const map = new ol.Map({ target: "map" });

      map.setView(
        new ol.View({
          center: ol.proj.fromLonLat([-118.805, 34.027]),
          zoom: 12
        })
      );

      const accessToken = "YOUR_ACCESS_TOKEN";

      const basemapId = "arcgis/streets";

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

      olms.apply(map, basemapURL);

    </script>
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Add a basemap selector

OpenLayers does not have a basemap layer switching widget, so you will use the a plain HTML <select> element.

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

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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;
      }

      #basemaps-wrapper {
        position: absolute;
        top: 20px;
        right: 20px;
      }
      #basemaps {
        font-size: 16px;
        padding: 4px 8px;
      }

    </style>
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In the <body> element, add the wrapper tag with an id of basemaps-wrapper.

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

    <div id="basemaps-wrapper">

    </div>
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In the wrapper element, add a <select> element with basemap layer enumerations and labels.

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    <div id="basemaps-wrapper">

        <select id="basemaps">
          <option value="arcgis/outdoor">arcgis/outdoor</option>
          <option value="arcgis/community">arcgis/community</option>
          <option value="arcgis/navigation">arcgis/navigation</option>
          <option value="arcgis/streets">arcgis/streets</option>
          <option value="arcgis/streets-relief">arcgis/streets-relief</option>
          <option value="arcgis/imagery">arcgis/imagery</option>
          <option value="arcgis/oceans">arcgis/oceans</option>
          <option value="arcgis/topographic">arcgis/topographic</option>
          <option value="arcgis/light-gray">arcgis/light-gray</option>
          <option value="arcgis/dark-gray">arcgis/dark-gray</option>
          <option value="arcgis/human-geography">arcgis/human-geography</option>
          <option value="arcgis/charted-territory">arcgis/charted-territory</option>
          <option value="arcgis/nova">arcgis/nova</option>
          <option value="osm/standard">osm/standard</option>
          <option value="osm/navigation">osm/navigation</option>
          <option value="osm/streets">osm/streets</option>
          <option value="osm/blueprint">osm/blueprint</option>
        </select>

    </div>
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Set the initial basemap layer

When the page loads, initialize the basemap layer to the first option in the menu.

Create a function called url that computes the style service URL for a basemap layer.

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    <script>

      const accessToken = "YOUR_ACCESS_TOKEN";

      const map = new ol.Map({ target: "map" });
      map.setView(
        new ol.View({
          center: ol.proj.fromLonLat([-118.805, 34.027]),
          zoom: 12
        })
      );

      const baseUrl = "https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles";
      const url = (style) => `${baseUrl}/${style}?token=${accessToken}`;
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Create a function called setBasemap that will clear existing layers and use olms to instantiate a basemap layer by name.

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      const baseUrl = "https://basemapstyles-api.arcgis.com/arcgis/rest/services/styles/v2/styles";
      const url = (style) => `${baseUrl}/${style}?token=${accessToken}`;

      const setBasemap = (style) => {
        // Clear out existing layers.
        map.setLayerGroup(new ol.layer.Group());

        // Instantiate the given basemap layer.
        olms.apply(map, url(style));
      };
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Call setBasemap to initialize the basemap layer to the arcgis/outdoor enumeration to match the first basemap in the select element.

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      const setBasemap = (style) => {
        // Clear out existing layers.
        map.setLayerGroup(new ol.layer.Group());

        // Instantiate the given basemap layer.
        olms.apply(map, url(style));
      };

      setBasemap("arcgis/outdoor");
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Set the selected basemap layer

Call setBasemap when the user selects an option in the <select> menu.

Extract the <select> DOM element using document.querySelector.

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      setBasemap("arcgis/outdoor");

      const basemapsSelectElement = document.querySelector("#basemaps");
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Call setBasemap in response to change events on the <select> element.

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      const basemapsSelectElement = document.querySelector("#basemaps");

      basemapsSelectElement.addEventListener("change", (e) => {
        setBasemap(e.target.value);
      });
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