Nicole,
I don't know how to do it without loading the portal item. Here is my code for loading the item and checking the spatialReference:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Load a basic WebMap - 4.5</title>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<link rel="stylesheet" href="https://js.arcgis.com/4.5/esri/css/main.css">
<script src="https://js.arcgis.com/4.5/"></script>
<script>
require([
"esri/views/MapView",
"esri/WebMap",
"esri/portal/PortalItem",
"dojo/domReady!"
], function(
MapView, WebMap, PortalItem
) {
var webmap = new WebMap({
portalItem: {
id: "f2e9b762544945f390ca4ac3671cfa72"
}
});
var view = new MapView({
map: webmap,
container: "viewDiv"
});
view.then(function(){
var item = new PortalItem({
id: "6d4b8b5b8a174c20b55b0934941030f4"
});
item.load()
item.fetchData("json").then(function(rslt){
console.info(rslt.spatialReference.wkid);
});
});
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>