var userContentUrl = user.portal.url + "/content/users/" + user.credential.userId,
folderUrl;
if ("Want to save to the root folder") {
folderUrl = userContentUrl;
} else {
folderUrl = userContentUrl + "/" + folderId;
}
var request = esri.request({
url: folderUrl + "/addItem",
content: item
}, {
usePost: true
});
request.then(requestSucceeded);