Here is what I was referring to:
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title>BasemapGallery widget - 4.9</title>
<link rel="stylesheet" href="https://js.arcgis.com/4.9/esri/css/main.css">
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<script src="https://js.arcgis.com/4.9/"></script>
<script>
var sbasemap = '';
require([
"esri/Map",
"esri/views/SceneView",
"esri/widgets/BasemapGallery"
], function(
Map, SceneView, BasemapGallery
) {
var map = new Map({
basemap: "gray"
});
var view = new SceneView({
container: "viewDiv",
map: map,
center: [139.68, 35.68],
zoom: 3
});
var basemapGallery = new BasemapGallery({
view: view
});
view.ui.add(basemapGallery, {
position: "top-right"
});
map.watch('basemap', function(evt){
switch(evt.title){
case 'Streets':
sbasemap = 'streets';
break;
case 'Imagery':
sbasemap = 'satellite';
break;
case 'Imagery with Labels':
sbasemap = 'hybrid';
break;
case 'Topographic':
sbasemap = 'topo';
break;
case 'Light Gray Canvas':
sbasemap = 'gray';
break;
case 'Dark Gray Canvas':
sbasemap = 'dark-gray';
break;
case 'Oceans':
sbasemap = 'oceans';
break;
case 'National Geographic':
sbasemap = 'national-geographic';
break;
case 'Terrain with Labels':
sbasemap = 'terrain';
break;
case 'OpenStreetMap':
sbasemap = 'osm';
break;
default:
sbasemap = 'noStringConstant';
}
console.info(sbasemap);
});
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>
