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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <html>
  <head>
    <meta charset="utf-8" />
    <meta
      name="viewport"
      content="initial-scale=1, maximum-scale=1,user-scalable=no"
    />
    <!--
     ArcGIS API for JavaScript, https://js.arcgis.com
     For more information about the widgets-expand sample,
     read the original sample description at developers.arcgis.com.
     https://developers.arcgis.com/javascript/latest/sample-code/widgets-expand/
     -->
    <title>Expand widget | Sample | ArcGIS API for JavaScript 4.20</title>

    <link
      rel="stylesheet"
      href="https://js.arcgis.com/4.20/esri/themes/light/main.css"
    />
    <script src="https://js.arcgis.com/4.20/"></script>

    <style>
      html,
      body,
      #viewDiv {
        padding: 0;
        margin: 0;
        height: 100%;
        width: 100%;
      }
    </style>

    <script>
      require([
        "esri/Map",
        "esri/views/SceneView",
        "esri/widgets/Expand",
        "esri/widgets/BasemapGallery"
      ], function (Map, SceneView, Expand, BasemapGallery) {
        var map = new Map({
          basemap: "satellite"
        });

        var view = new SceneView({
          container: "viewDiv",
          map: map
        });

        // Create a BasemapGallery widget instance and set
        // its container to a div element

        var basemapGallery = new BasemapGallery({
          view: view,
          container: document.createElement("div")
        });

        // Create an Expand instance and set the content
        // property to the DOM node of the basemap gallery widget
        // Use an Esri icon font to represent the content inside
        // of the Expand widget

        var bgExpand = new Expand({
          view: view,
          content: basemapGallery
        });

        view.when(() => {
          bgExpand.expandTooltip = `${bgExpand.label} ${basemapGallery.label}`;
        });

        // close the expand whenever a basemap is selected
        basemapGallery.watch("activeBasemap", function () {
          var mobileSize =
            view.heightBreakpoint === "xsmall" ||
            view.widthBreakpoint === "xsmall";

          if (mobileSize) {
            bgExpand.collapse();
          }
        });

        // Add the expand instance to the ui

        view.ui.add(bgExpand, "top-right");
      });
    </script>
  </head>

  <body>
    <div id="viewDiv"></div>
  </body>
</html>
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