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var ctx = new SP.ClientContext.get_current();
var web = ctx.get_web();
ctx.load(web);
var user = web.get_currentUser();
alert(user);

I used above code to get the current user using JavaScript, but I got an error:

'SP.ClientContext.get_current' is null or not an object

What should I do? Any help appreciated.

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possible duplicate of SP.ClientContext.get_current() returning undefined objects –  Robert Lindgren Jul 18 '13 at 13:52
    
Which version of SharePoint are you using and what type of solution are you building? –  EHorodyski Jul 18 '13 at 14:59
    
i am using SharePoint 2013. –  Nera Jul 18 '13 at 17:50

2 Answers 2

I have used SharePoint’s JavaScript Object Model to retrieve the current logged in username.Once you have executed the load and executeQueryAsync methods and the call to SharePoint was sucessful, then inside of the onQuerySucceeded method is where I display the username to the browser using the SP.Principal.get_loginName property. Try it out…you can host and run the code below inside of a content editor web part in SharePoint 2010.

<script type="text/javascript">
ExecuteOrDelayUntilScriptLoaded(init,'sp.js');
var currentUser;
function init(){
    this.clientContext = new SP.ClientContext.get_current();
    this.oWeb = clientContext.get_web();
    currentUser = this.oWeb.get_currentUser();
    this.clientContext.load(currentUser);
    this.clientContext.executeQueryAsync(Function.createDelegate(this,this.onQuerySucceeded), Function.createDelegate(this,this.onQueryFailed));
}

function onQuerySucceeded() {
    document.getElementById('userLoginName').innerHTML = currentUser.get_loginName(); 
    document.getElementById('userId').innerHTML = currentUser.get_id();
    document.getElementById('userTitle').innerHTML = currentUser.get_title();
    document.getElementById('userEmail').innerHTML = currentUser.get_email();
}

function onQueryFailed(sender, args) {
    alert('Request failed. \nError: ' + args.get_message() + '\nStackTrace: ' + args.get_stackTrace());
}
</script>
<div>Current Logged User:
    <span id="userLoginName"></span>
    <span id="userId"></span>
    <span id="userTitle"></span>
    <span id="userEmail"></span>
</div>

or use the below code

function CallClientOM()
{
var context = new SP.ClientContext.get_current();
this.website = context.get_web();
this.currentUser = website.get_currentUser();
context.load(currentUser);
context.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}



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



function onQueryFailed(sender, args)
{
alert('request failed ' + args.get_message() + '\n'+ args.get_stackTrace());
}
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i tried your code, but got an error it showed "Sys.ArgumentUndefinedException: Value cannot be undefined. Parameter name: method" –  Nera Jul 18 '13 at 18:22

I normally use this function below. You can modify it depending on how you want to use it.

function getUserInformation(){
   var context = new SP.ClientContext.get_current();
   var web = context.get_web();  
   var currentUser = web.get_currentUser();  
   currentUser.retrieve();
   context.load(web);
   context.executeQueryAsync(
      function(){ //On success function
        var userObject = web.get_currentUser();
        var email = userObject.get_email();
        var id = userObject.get_id();
        var loginName = userOBject.get_loginName();
     },
     function(){ //On fail function
        alert('Error: ' + args.get_message() + '\n' + args.get_stackTrace());
     }
  );
}
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