How to add/update SharePoint user field (person group column) using ECMA Scripts

 

SharePoint app model supports enough capability to work with SharePoint from JavaScript.

Working with Person Group column is a common task in SharePoint development. Following illustrates how to  update  a single and multiple values to  SharePoint person group column.

Insert / Update Single Value SharePoint Person Group Column (People Field)

Tip: For single value you should refer the person or group by ID

var  user = new SP.FieldUserValue();

user = 1; // this is the ID for User or Group in SharePoint

listitem.set_item("Column Name", user);

listitem.Update();

ctx.ExecuteQuery();

Insert / Update Multi Value SharePoint Person Group Column (People Field)

Tip: For multiple users you need to refer it by login name

var  users =[];

users.push(SP.FieldUserValue.fromUser("dev Members")); // adding group

users.push(SP.FieldUserValue.fromUser("i:0#.f|membership|melick@oapp.onmicrosoft.com")); // adding user

listitem.set_item("Column Name", users);

listitem.Update();

ctx.ExecuteQuery();

*listitem  this is the list item you need to manipulate. If you are inserting a item this will be created using ListItemCreationInfo and if you are updating a item this will be a reference to the item you seek

Ref: http://msdn.microsoft.com/en-us/library/office/hh185011(v=office.14).aspx