Client should send a message "{user} joined the chat" on connecting, and "{user} left the chat" on disconnecting.

I did try to implement this in the original version, but had SignalR errors. I suspect the chat connecting had not completed when connecting (I think the .start() method may return a promise?).

At present the Start(), Send() and Stop() methods are all synchronous, but it's likely the underlying js methods are async, returning promises.

Need to rewrite ChatClient to be async and amend chatClient.js to match.

The text <code>invokeAsync&lt;object&gt;</code> gets rendered as <code>invokeAsync <object></object> on the Index page

I have blazor sample working, and can start chats etc, but I am wanting to connect a console app to the same chat hub on the same pc, but cannot.

Here is the sample code
` private static void Main(string[] args)
{
Console.WriteLine("Starting App...");

        //Set connection
        //var connection = new HubConnection("http://127.0.0.1:6836/");
        var connection = new HubConnection("http://localhost:6836");
        //Make proxy to hub based on hub name on server
        var myHub = connection.CreateHubProxy("/ChatHub");
        //Start connection

        Console.WriteLine("Starting Connection");

        for (int i = 0; i < 5; i++)
        {
            Console.WriteLine("Sleeping...");
            Thread.Sleep(1000);
        }

        myHub.On<string>("addMessage", param => {
            Console.WriteLine(param);
        });

        connection.Start().ContinueWith(task => {
            if (task.IsFaulted)
            {
                Console.WriteLine("There was an error opening the connection:{0}",
                                  task.Exception.GetBaseException());
            }
            else
            {
                Console.WriteLine("Connected");
            }

        }).Wait();
        

        for (int i = 0; i < 5;i++)
            {
            Console.WriteLine("Sleeping...");
            Thread.Sleep(1000);
            }        

        myHub.Invoke<string>("Send", "HELLO World ").ContinueWith(task => {
            if (task.IsFaulted)
            {
                Console.WriteLine("There was an error calling send: {0}",
                                  task.Exception.GetBaseException());
            }
            else
            {
                Console.WriteLine(task.Result);
            }
        });

`

The error is
There was an error opening the connection:Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: ?. Path '', line 0, position 0.
at Newtonsoft.Json.JsonTextReader.ParseValue()
at Newtonsoft.Json.JsonTextReader.ReadInternal()
at Newtonsoft.Json.JsonTextReader.Read()
at Newtonsoft.Json.Linq.JObject.Load(JsonReader reader)
at Newtonsoft.Json.Linq.JObject.Parse(String json)
at Microsoft.AspNet.SignalR.Client.Transports.TransportHelper.<>c.b__0_1(String raw) in //src/Microsoft.AspNet.SignalR.Client/Transports/TransportHelper.cs:line 43
at Microsoft.AspNet.SignalR.TaskAsyncHelper.<>c__DisplayClass31_02.<Then>b__0(Task1 t) in //src/Microsoft.AspNet.SignalR.Core/TaskAsyncHelper.cs:line 494
at Microsoft.AspNet.SignalR.TaskAsyncHelper.TaskRunners2.<>c__DisplayClass3_0.<RunTask>b__0(Task1 t) in /_/src/Microsoft.AspNet.SignalR.Core/TaskAsyncHelper.cs:line 1280

Any clues as to what I am doing wrong ?

Server is refusing websocket connections for SignalR, using SSE instead.

A few issues to fix:

• the disconnect button isn't visible on xs view mode
• the chat box and Send button are not aligned
• the chat box should be in a fixed footer so it does not scroll as the messages arrive
• should support Enter in chat box so you don't have to click send
• chat box should focus after a message so chat can continue

The project cannot be opened in visual studio and when i try to run with dotnet run i get this error that only happens with this application:
Found .NET Core SDK, but did not find dotnet.dll at [C:\Program Files\dotnet\sdk\3.1.100\dotnet.dll]

Hi
You demo is awesome: really tnx.
Just a stupid question: what is the purpose of connections lookup object in chatClient.js ?
We can have only 1 connection in this sample.
Why not use a simple object ?
Tnx

as I understand it this is a public chat, where anyone who enters talks with everyone. don't have a way to make a hub between two people only?

Upgrade to latest .NET Core 3 preview:
https://devblogs.microsoft.com/aspnet/asp-net-core-and-blazor-updates-in-net-core-3-0-preview-6/

Known bug in current mono WASM release:
mono/mono#18628

This has now been fixed but we are awaiting the next Blazor/WASM release.