SignalR 2.0 Hub public method not accecible via Java Script

Question

I'm trying to get list of connected users by using the following server code in SignalR hub. For store in-memory data I'm using following class:

public class UserInfo
    {
        public string ConnectionId { get; set; }
        public string UserName { get; set; }
        public string Role { get; set; }
    }

When user connected I'm adding user to the list of connected users:

public override Task OnConnected()
            {
                if (Context.User.Identity.IsAuthenticated)
                {
                    if (Context.User.IsInRole("User"))
                    {
                        ui.Add(new UserInfo { ConnectionId = Context.ConnectionId, UserName = Context.User.Identity.Name, Role = "User" });
                    }
                    else
                    {
                        ui.Add(new UserInfo { ConnectionId = Context.ConnectionId, UserName = Context.User.Identity.Name, Role = "Operator" });
                    }
                }
                return base.OnConnected();
            }

Here is the way I'm getting list of currently connected users:

public IEnumerable<UserInfo> GetUsers()
        {
            var x = (from a in ui where a.Role == "User" select new UserInfo { UserName = a.UserName, ConnectionId = a.ConnectionId }).ToList();
            return x;
        }
        public IEnumerable<UserInfo> GetOperators()
        {
            var y = (from a in ui where a.Role == "Operator" select new UserInfo { UserName = a.UserName, ConnectionId = a.ConnectionId }).ToList();
            return y;
        }

Unfortinately public method GetOperators/GetUsers not accessible and I did not receive data on client side:

$(function () {
            // Declare a proxy to reference the hub. 
            var chat = $.connection.chatHub;
            //Here I'm calling hub public methods
            chat.getOperators = function (data) {
                alert(data);
            };
            chat.getUsers = function (data) {
                alert(data);
            };
            // Create a function that the hub can call to broadcast messages.
            chat.client.addChatMessage = function (name, message) {
                // Html encode display name and message. 
                var encodedName = $('<div />').text(name).html();
                var encodedMsg = $('<div />').text(message).html();
                // Add the message to the page. 
                $('#discussion').append('<li><strong>' + encodedName
                    + '</strong>:&nbsp;&nbsp;' + encodedMsg + '</li>');
            };
            // Get the user name and store it to prepend to messages.
            $('#displayname').val(prompt('Enter your name:', ''));
            // Set initial focus to message input box.  
            $('#message').focus();
            // Start the connection.
            $.connection.hub.start().done(function () {
                $('#sendmessage').click(function () {
                    // Call the Send method on the hub. 
                    chat.server.sendChatMessage($('#displayname').val(),      $('#message').val());             
                    // Clear text box and reset focus for next comment. 
                    $('#message').val('').focus();
                });
            });
        });

Answer 1

Your syntax for the calls to the server is wrong; this here:

chat.getUsers = function (data) {
    alert(data);
};

will simply define chat.getUsers to be a function.

You probably want

chat.server.getUsers().done(function(data) {
    console.log(data);
}).fail(function(error) {
    console.log("failed to get data", error);
});

Take another look at the documentation.

Answer 2

please can you try this

 //on your client action do a server call 

 chat.server.getOperators();

and

//on your client action do a server call  
 chat.server.getUsers(); 

instead of

chat.getOperators = function (data) {
                alert(data);
            };
            chat.getUsers = function (data) {
                alert(data);
            };