SignalR cannot read property client of undefined

Question

I\'m trying to add SignalR to my project (ASPNET MVC 4). But I can\'t make it work.

In the below image you can see the error I\'m receiving.

Answer 1

Your hub classes must be defined as public. For example:

class ChatHub : Hub

should actually be

public class ChatHub : Hub

Answer 2

Make sure you add

app.MapSignalR();

inside startup.cs and Configuration method, like this:

 public partial class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            app.MapSignalR();
        }
    }

For Asp.net Core

Add

services.AddSignalR();

in ConfigureServices methode in your startup.cs

And add

app.UseSignalR(routes =>
            {
                routes.MapHub<ChatHub>("/chatHub");
            });

in Configure methode in your startup.cs

Answer 3

Making the Hub class "public" solved it for me.

Answer 4

You should put SignalR and jQuery scripts, in correct order :

<script src="/Scripts/jquery-1.6.4.min.js" ></script>

<script src="/Scripts/jquery.signalR-1.1.4.js"></script>

<script src="/signalr/hubs"></script>