Get the user id via javascript

Question

How can you get the current users id using javascript? Can you do this any JS file or does it need to be added at a certain point?

Answer 1

My favorite is to use the SPServices jQuery library, specifically the GetCurrentuser operation.

Answer 2

Since you are working on 2010 version you can use Client Object Model to get current user (and some other cool stuff).

Here is link to simple example:

• SharePoint 2010 ECMAScript - How to know logged in user information

Code:

<script type="text/javascript">
    ExecuteOrDelayUntilScriptLoaded(getWebUserData, "sp.js");
    var context = null;
    var web = null;
    var currentUser = null;

    function getWebUserData() {
        context = new SP.ClientContext.get_current();
        web = context.get_web();
        currentUser = web.get_currentUser();
        currentUser.retrieve();
        context.load(web);
        context.executeQueryAsync(Function.createDelegate(this, this.onSuccessMethod), 
             Function.createDelegate(this, this.onFailureMethod));
    }

    function onSuccessMethod(sender, args) {
        var userObject = web.get_currentUser();
        alert('User name:' + userObject.get_title() + '\n Login Name:' + 
                 userObject.get_loginName());
    }

    function onFailureMethod(sender, args) {
        alert('request failed ' + args.get_message() + '\n' + args.get_stackTrace());
    }
</script>