Want to send message to only connected client SignalR [Answered]RSS

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  mou_inn

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  Want to send message to only connected client SignalR

  Oct 06, 2014 02:53 AM|mou_inn|LINK

  <div class="post-text" itemprop="text">

  here i got bit code for signalr and included.

  client code

  $(function () {
      // Proxy created on the fly
      var chat = $.connection.chat;
  
      // Declare a function on the chat hub so the server can invoke it
      chat.addMessage = function (message) {
          $('#messages').append('<li>' + message + '');
      };
  
      $("#broadcast").click(function () {
          // Call the chat method on the server
          chat.send($('#msg').val());
      });
  
      // Start the connection
      $.connection.hub.start();
  });

  server code

  public class Chat : Hub
  {
      public void Send(string message)
      {
          // Call the addMessage method on all clients
          Clients.addMessage(message);
      }
  }

  just see this line Clients.addMessage(message); addMessage() will invoke addMessage() function in client side but think suppose when i am sending data or message to specific client and if that is client is not connected any more then what will happen?

  is there any provision in signalr like can we determine that client is connected before delivering data to specific client.

  i want to detect a specific client is connected or not before sending data to client. if client is not connected then i will store data in db for that specific user. please help me with sample code that how to detect a specific client is connected or not? thanks

  </div>
• • Reply
  Kevin Shen -...

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  Microsoft

  Re: Want to send message to only connected client SignalR

  Oct 06, 2014 10:08 PM|Kevin Shen - MSFT|LINK

  Hi mou_inn,

  For each client connect to hub  will pass a unique connection id,you can get the this value of the hub context.You can also map a user to the connection id.

  You can use the OnConnected,OnDisconnected ,and OnReconnected methods of the hub class to track the user connection status.

  Please refer to link  for more information about how to map signalR user to connections:

  http://www.asp.net/signalr/overview/guide-to-the-api/mapping-users-to-connections

  You can use a dictionary to store the  user and the connectionId.

  You can store the use and connectionid in the  OnConnected Method like below:

  public override Task OnConnected()
          {
              string name = Context.User.Identity.Name;
             _connections.Add(name, Context.ConnectionId);
            return base.OnConnected();
         }
  

  For more details ,please refer to the link:

   

  http://www.asp.net/signalr/overview/guide-to-the-api/mapping-users-to-connections#inmemory

  Best Regards,

  Kevin Shen.

  Please Mark as Answer If it help you,thanks
• • Reply
  mou_inn

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  Re: Want to send message to only connected client SignalR

  Oct 07, 2014 09:30 AM|mou_inn|LINK

  In memory storing userid and his connection would be good when traffic will be huge?
• • Reply
  mou_inn

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  Re: Want to send message to only connected client SignalR

  Oct 07, 2014 02:12 PM|mou_inn|LINK

  one different question. when we call client side code from signalr hub server side code then can we call client side in such a way that client side function will return value to server side function from where the client side function will be called?

  please discuss. thanks