Anjelina,
Here is a sample for custom basemaps and using the Basemap Gallery dijit: (attached is the images that this sample requires)
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
<title>Display Multiple ArcGIS Online Services</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.22/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.22/esri/css/esri.css">
<style>
html,
body {
height: 97%;
width: 98%;
margin: 1%;
}
#map {
border: solid 1px #B5BCC7;
padding: 0;
}
#paneHeader {
background: url(images/header.png) repeat-x;
color: white;
border-bottom: solid 1px #B5BCC7;
text-align: center;
height: 30px;
margin: 0;
overflow: hidden;
font-size: 16px;
padding: 8px 5px;
}
#rightPane {
width: 150px;
margin: 0;
padding: 0;
}
</style>
<script src="https://js.arcgis.com/3.22/"></script>
<script>
var map;
require([
"esri/map", "esri/dijit/BasemapGallery",
"dojo/parser", "esri/dijit/BasemapLayer", "esri/dijit/Basemap",
"dijit/layout/BorderContainer", "dijit/layout/ContentPane",
"dojo/domReady!"
], function(
Map, BasemapGallery,
parser, BasemapLayer, Basemap
) {
parser.parse();
map = new Map("map");
var basemaps = [];
var waterTemplateLayer = new BasemapLayer({
url: "https://sampleserver1.arcgisonline.com/ArcGIS/rest/services/WaterTemplate/LocalGovernmentInfrastruct..."
});
var waterBasemap = new Basemap({
layers: [waterTemplateLayer],
title: "Water Template",
thumbnailUrl: "images/waterThumb.png"
});
basemaps.push(waterBasemap);
var publicSafetyLayer = new BasemapLayer({
url: "https://sampleserver1.arcgisonline.com/ArcGIS/rest/services/PublicSafety/PublicSafetyBasemap/MapServ..."
});
var publicSafetyBasemap = new Basemap({
layers: [publicSafetyLayer],
title: "Public Safety",
thumbnailUrl: "images/safetyThumb.png"
});
basemaps.push(publicSafetyBasemap);
var basemapGallery = new BasemapGallery({
showArcGISBasemaps: false,
basemaps: basemaps,
map: map
}, "basemapGallery");
basemapGallery.startup();
basemapGallery.on("error", function(error) {
console.log(error);
});
});
</script>
</head>
<body class="claro">
<div data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline', gutters:true" style="width:100%;height:100%;">
<div id="map" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'">
</div>
<div data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'right'" id="rightPane">
<div data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline', gutters:false" style="width:100%;height:100%;">
<div id="paneHeader" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'top'">
<span>Select Basemap</span>
</div>
<div data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'">
<div id="basemapGallery"></div>
</div>
</div>
</div>
</div>
</body>
</html>
