Get the group of the current user using REST API

Question

I'm trying to get the group of current user. By using this code:

function checkGroup() {
    var group = ["D", "Sup", "A", "CP"];
    for (var i = 0; i < group.length; i++) {
        if (isMember(group[i]) == true)
        {

            alert('I am a member of the group'+ i);
            break;
        }
    }

}    

function isMember(groupName){
    $.ajax({
        url: _spPageContextInfo.webAbsoluteUrl + "/_api/web/sitegroups/getByName('"+groupName+"')/Users?$filter=Id eq " + _spPageContextInfo.userId,
        method: "GET",
    headers: { "Accept": "application/json; odata=verbose"},
    success: function (data) {
        alert('I am a member of the group' + groupName);
        return true;

    },
    error: function (data) {
        return false;

    },
        asyn:false,
    });
}

the problem is , it always return true , means i the member of all group which is false .

Any idea ??

Answer 1

The following example demonstrates how to determine whether current users belongs to the specified groups:

getCurrentUserWithDetails()
.done(function(data)
{
    var groupNames = ['News Owners','Approvers'];
    //determine wether current user is a memeber of group(s) 
    var userGroups = data.d.Groups.results;
    var foundGroups = userGroups.filter(function(g){ return groupNames.indexOf(g.LoginName) > -1});

})
.fail(
function(error){
    console.log(JSON.stringify(error));
});

where getCurrentUserWithDetails function is used to get current user with groups:

function getCurrentUserWithDetails()
{
    var endpointUrl = _spPageContextInfo.webServerRelativeUrl + '/_api/web/currentuser/?$expand=groups';
    return $.ajax({
            url: endpointUrl,
            method: "GET",
            contentType: "application/json;odata=verbose",
            headers: {   
             "Accept": "application/json;odata=verbose"
            } 
        });
}

Key points: more optimal from performance perspective since only a single request is submitted to the server

Answer 2

You can get current Loggedin user's name using below code as well.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript">
    var userid = _spPageContextInfo.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 Logg = data.d;
        //get login name
        var loginName = Logg.LoginName.split('|')[1];
        alert(loginName);
        //get display name
        alert(Logg.Title);
    }

    function onError(error) {
        alert("error");
    }
</script>