How to get the login name of the current user using JavaScript?

Question

I tried this code:

  var context = new SP.ClientContext.get_current();

  this.website = context.get_web();

  this.currentUser = website.get_currentUser(); 

  alert(currentUser);

But I got an alert and it shows "[object object]".

How to get the loginName of current user? Any help appreciated.

Answer 1

If you are working on SharePoint Online, then they have introduced a new variable to hold the current user's login name in the _spPageContextInfo global object.

_spPageContextInfo.userLoginName;

This will get you the login name without making any AJAX calls with JSOM or REST.

Answer 2

function GetCurrentUsername()
{
    var ctx = new SP.ClientContext.get_current();
    this.website = ctx.get_web();
    this.currentUser = website.get_currentUser();
    ctx.load(currentUser);
    ctx.executeQueryAsync(Function.createDelegate(this, this.onSuccess), Function.createDelegate(this, this.onFail));
}

function onSuccess(sender, args)
{
    alert(currentUser.get_loginName());
}

function onFail(sender, args)
{
    alert('request failed ' + args.get_message() + '\n'+ args.get_stackTrace());
}

Answer 3

It shows [object object] in your alert message because you are trying to display an object instead of its properties. [Object object] is the default serialization of an object in JavaScript.

You can use JSOM or REST API to get current user as follows

JSOM

 function getCurrentUser() {
        var context = new SP.ClientContext.get_current();
        var web = context.get_web();
        currentUser = web.get_currentUser();
        context.load(currentUser);
        context.executeQueryAsync(onSuccess, onFail);
    }

    function onSuccess(sender, args) {
        var acountname = currentUser.get_loginName(); // extract the login name from the account name
        // var username = currentUser.get_title(); 
    }

    function onFail(sender, args) {
        alert('Failed to get current user' + args.get_message());
    }

using REST API // for SharePoint 2013

function getUser() {
    var userid = _spPageContextInfo.userId;
    // alert(userid);

    var requestUri = _spPageContextInfo.webAbsoluteUrl + "/_api/web/getuserbyid(" + userid + ")";
    var requestHeaders = { "accept": "application/json;odata=verbose" };
    $.ajax({
        url: requestUri,
        contentType: "application/json;odata=verbose",
        headers: requestHeaders,
        success: onSuccess,
        error: onError
    }); function onSuccess(data, request) {
        var loginName = data.d.Title;
        alert(loginName);
    } function onError(error) {
        alert("Error on retrieving current user.");
    }
}

Answer 4

You never load any objects and never executes the query so there is no wonder you get an error.

Do something like:

var clientContext = SP.ClientContext.get_current();
var website = clientContext.get_web();
currentUser = website.get_currentUser();
clientContext.load(website);
clientContext.load(currentUser);
   clientContext.executeQueryAsync(onRequestSucceeded, onRequestFailed);

function onRequestSucceeded() {
    alert(currentUser.LoginName);
}

function onRequestFailed(sender, args) {
    alert('Error: ' + args.get_message());
}

Where website and currentUser are declared in the outer function (encapsuling the onRequestSucceeded method)

With reservation for errors in the code (are writing this from my phone)

Answer 5

Try this:

alert(currentUser.get_loginName());

Reference: Working with users using javascript

Answer 6

String userName=string.Empty;
using (SPSite osite = new SPSite(SPContext.Current.Web.Url))
{
    using (SPWeb oweb = osite.OpenWeb())
    {
        if (oweb.CurrentUser != null)
        {
            if (oweb.CurrentUser.LoginName.Contains("\\"))
            {
             string[] usernameLogged = oweb.CurrentUser.LoginName.Split('\\');
                if (usernameLogged.Length > 0)
                {
                    userName = usernameLogged[1].ToString();
                }
            }
        }
    }
}