Restricting People Picker of "Person or Group" column to Site Groups only

Question

Hi,
I am working on SharePoint Online 2013 and I have created a column - DocOwner with "Person or Group" type in document library. In the site collection there are 4 groups lets say - A,B,C,D. When user creates a new item (document set), in newform.aspx,
I want to restrict the people picker of "Docowner" column to only Site groups, as currently it is showing all users who are there in SharePoint online.
I read this article - http://office.microsoft.com/en-in/sharepoint-server-help/site-column-types-and-options-HA010302196.aspx#_Toc277149829.........where they are saying that we can limit the people picker to site users only.
How this can be achieved using OOTB in SharePoint 2013 Online ? 
Vipul Jain

Answer 1

You can create a workflow to execute CSOM which will verify group membership details and update it to choice column 
http://stackoverflow.com/questions/23432665/sharepoint-online-csom-associated-site-groups-associatedmembergroup-associatedow
http://sundarnarasiman.net/?p=497
namespace GetUsersInGroupCSOM
class Program
static void Main(string[] args)
//Replace it with the url of your tenant or your site-collection
string SiteUrl = "https://yoursite.sharepoint.com";
System.Uri oUri = new System.Uri(SiteUrl);
using (ClientContext oClientContext = new ClientContext(SiteUrl))
//Replace it with your user id for SharePoint Online
string UserName = "[email protected]";
//Replace it with your password
string Password = "yourpassword";
//Create a SecureString object from password string, needed for SharePointOnlineCredentials class
SecureString SecurePassword = GetSecureString(Password);
oClientContext.Credentials = new SharePointOnlineCredentials(UserName, SecurePassword);
//Load the site-collection groups using CSOM
oClientContext.Load(oClientContext.Web.SiteGroups);
oClientContext.ExecuteQuery();
GroupCollection oSiteCollectionGroups= oClientContext.Web.SiteGroups;
Console.WriteLine("List of groups in the site collection");
Console.WriteLine("-------------------------------------");
foreach (Group oGroup in oSiteCollectionGroups)
Console.WriteLine(oGroup.Title);
Console.WriteLine("\n");
//Load the users collection in the Group 1
oClientContext.Load(oSiteCollectionGroups[1].Users);
oClientContext.ExecuteQuery();
Console.WriteLine("List of users in the first group of site-collection");
Console.WriteLine("-------------------------------------");
foreach(User oUser in oSiteCollectionGroups[1].Users)
Console.WriteLine(oUser.Title);
Console.WriteLine("\n");
Console.ReadLine();
private static SecureString GetSecureString(String Password)
SecureString oSecurePassword = new SecureString();
foreach (Char c in Password.ToCharArray())
oSecurePassword.AppendChar(c);
return oSecurePassword;
http://the-north.com/sharepoint/post/Update-Choice-Field-using-CSOM-%28Client-side-Object-Model%29
using (ClientContext
ctx = new ClientContext("http://MyServer/MySite"))
Field genericField = ctx.Web.Lists.GetById(listID).Fields.GetById(fieldGuid);
FieldChoice fldChoice = ctx.CastTo<FieldChoice>(genericField);
                ctx.Load(genericField);
                fldChoice.Choices = “MyChoice1;MyChoice2;MyChoice3”.Split(";".ToCharArray());
                fldChoice.Update();
                ctx.ExecuteQuery();               
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