Here's the better solution:
<!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>Layer List Dijit</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.17/dijit/themes/claro/claro.css">
<link rel="stylesheet" href="https://js.arcgis.com/3.17/esri/css/esri.css">
<style>
html, body, .container, #map {
height:100%;
width:100%;
margin:0;
padding:0;
margin:0;
font-family: "Open Sans";
}
#map {
padding:0;
}
#layerListPane{
width:25%;
}
.esriLayer{
background-color: #fff;
}
.esriLayerList .esriList{
border-top:none;
}
.esriLayerList .esriTitle {
background-color: #fff;
border-bottom:none;
}
.esriLayerList .esriList ul{
background-color: #fff;
}
</style>
<script>var dojoConfig = { parseOnLoad: true };</script>
<script src="https://js.arcgis.com/3.17/"></script>
<script>
require([
"esri/arcgis/utils",
"esri/dijit/LayerList",
"esri/dijit/LayerSwipe",
"dojo/_base/array",
"dijit/layout/BorderContainer",
"dijit/layout/ContentPane",
"dojo/domReady!"
], function(
arcgisUtils,
LayerList,LayerSwipe,
array
) {
//Create a map based on an ArcGIS Online web map id
arcgisUtils.createMap("62702544d70648e593bc05d65180fd64", "map").then(function(response){
var id;
var map = response.map;
var title = "2009 Obesity Rates";
var layers = response.itemInfo.itemData.operationalLayers;
array.some(layers, function(layer){
if(layer.title === title){
id = layer.id;
if(layer.featureCollection && layer.featureCollection.layers.length){
id = layer.featureCollection.layers[0].id;
}
return true;
}else{
return false;
}
});
// layer list
var myWidget = new LayerList({
map: response.map,
layers: arcgisUtils.getLayerList(response)
},"layerList");
myWidget.startup();
//get the layer from the map using the id and set it as the swipe layer.
if(id){
var swipeLayer = map.getLayer(id);
var swipeWidget = new LayerSwipe({
type: "vertical", //Try switching to "scope" or "horizontal"
map: map,
layers: [swipeLayer]
}, "swipeDiv");
swipeWidget.startup();
}
});
});
</script>
</head>
<body class="claro">
<div class="container" data-dojo-type="dijit/layout/BorderContainer"data-dojo-props="design:'headline',gutters:false">
<div id="layerListPane" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'right'">
<div id="layerList"></div>
</div>
<div id="map" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'">
<div id="swipeDiv"></div>
</div>
</div>
</body>
</html>
