Unable to save all users into SharePoint list

Question

I am creating a list item using the code below:

var context = new SP.ClientContext.get_current(); 
var dfd = $.Deferred(); 
var targetList = context.get_web().get_lists().getByTitle(listName);
context.load(targetList); 
var itemCreateInfo = new SP.ListItemCreationInformation(); 
var listItem = targetList.addItem(itemCreateInfo);

listItem.set_item("Title", listValues[0].Title); 
listItem.set_item("Department", listValues[0].Department);  
listItem.set_item("TeamMembers", listValues[0].TeamMembers);
listItem.set_item("Notes", listValues[0].Notes);  
listItem.update();
context.executeQueryAsync( 
    function () { 
        var id = listItem.get_id();
        if (listValues[0].Files.length > 0) {   
             if (fileCountCheck <= listValues[0].Files.length - 1) {                 
                 loopFileUpload(listName, id, listValues, fileCountCheck).then( 
                 function () { }, 
                 function (sender, args) { 
                     dfd.reject(sender, args); 
                 } ); 
            } 
        } 
        else { dfd.resolve(fileCountCheck);             } 
    }, 
    function (sender, args) {       }   ); 

TeamMembers is a string containing the UserIds of all the users selected in a people picker, in the format ;#564;#5454;#56;#865;#

It is working if only one person is selected. I noticed that when there are multiple users selected, many of them are not getting saved into the list.

What could be the issue?

Answer 1

Thanks to the comment by @Ganesh Sanap, I changed the data passed into the user field as below:

TeamMembers now has a value in the format ";#" + this.user1.get_id() + ";#" + this.user1.get_loginName() + ";" + this.user2.get_id() + ";#" + this.user2.get_loginName().

With the latest format, I am able to successfully save all the usernames into the list.

Answer 2

Instead of passing only User IDs in TeamMembers, try passing the User ID as well as User Login name separated ;# (And multiple users separated by ;) like below:

var userField = this.user1.get_id() + ";#" + this.user1.get_loginName()+";"+this.user2.get_id() + ";#" + this.user2.get_loginName(); // and so on...
listItem.set_item('TeamMembers', userField);
listItem.Update();

Reference: Add multiple people using Javascript Client Object Model.