Check if Current Users belongs to SP group using javascript Client Side Object Model

Question

I havent found a specific example of how to get the current user and then check if it belongs to a specific sharepoint group, as I havent found anything I cant provide a cod

Answer 1

If anyone is interested. This approach can be used when you want to check if a user is a member of a group using the group name.

    var currentUserIsMemberOf = function(groupName){
      var found = false;
      var dfd = $.Deferred(function(){
         SP.SOD.executeOrDelayUntilScriptLoaded(function(){
            context = new SP.ClientContext.get_current();
            allGroups = context.get_web().get_siteGroups();
            context.load(allGroups);
            context.load(allGroups, 'Include(Users)');

            context.executeQueryAsync(
               function(){
                  var groupsEnumerator = allGroups.getEnumerator();
                  while (groupsEnumerator.moveNext()) {
                      var group = groupsEnumerator.get_current();               
                      if(group.get_title() == groupName) {
                          var usersEnumerator = group.get_users().getEnumerator();
                          while (usersEnumerator.moveNext()) {
                             var user = usersEnumerator.get_current();   
                             if(user.get_id() == _spPageContextInfo.userId) {
                                found = true;
                                break;
                             }
                          }
                      }
                   }
                  dfd.resolve(found);
               },
               function(){
                  dfd.reject(args.get_message());
               }
            );
         }, 'sp.js');
      });
      return dfd.promise();
   }

You can use like this

currentUserIsMemberOf("Members of Demo").done(function(result){ 
                                                  alert(result) 
                                                });

Note this code use Promise, you can reference jQuery use your own custom Deferred object or remove Deferred object.