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Editorial Team
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Asked: 2026-06-11T03:01:35+00:00

im getting a prblem when i want to send data o start a sub

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im getting a prblem when i want to send data o start a sub from hub when the page is loading. ill put this sample code because is short

this is my chat.vb

 Imports System
 Imports System.Collections.Generic
 Imports System.Linq
 Imports System.Web
 Imports SignalR.Hubs

 Public Class Chat
    Inherits Hub
    Public Sub Send(message As String)
       ' Call the addMessage method on all clients
        Clients.addMessage(message)
    End Sub
 End Class

and this is my default.aspx

 <script src="Scripts/jquery-1.6.4.min.js" type="text/javascript"></script>
 <script src="Scripts/jquery.signalR-0.5.3.js" type="text/javascript"></script>
 <script src="signalr/hubs" type="text/javascript"></script>
 <script language="javascript" type="text/javascript">
    $(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 + '</li>');
        };

        $("#broadcast").click(function () {
           // Call the chat method on the server
           chat.send($('#msg').val());
       }); 
       // Start the connection
       $.connection.hub.start();
    });
 </script>
 </head>
 <body>
   <form id="form1" runat="server">
   <div style="position: absolute; left: 0; top: 0; height: 100%; width: 100%">
     <input type="text" id="msg" />
     <input type="button" id="broadcast" value="broadcast" /> 
     <ul id="messages">
     </ul>
   </div> 
   </form>
 </body>

i dont want to press the button, i want he doit all by itself when loads the page

when i put it like this

    <script language="javascript" type="text/javascript">
      $(document).ready(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 + '</li>');
        }; 

       chat.send('Hello World');

       // Start the connection
       $.connection.hub.start();
    });
 </script>

i got an connection problem
i get this error “SignalR: Connection must be started before data can be sent. Call .start() before .send()”;

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1 Answer

  1. Editorial Team

    You must call start before you do send.

    So: 

    chat.send('Hello World');

// Start the connection
$.connection.hub.start();

    SHOULD BE:

    // Start the connection
$.connection.hub.start().done(function () {
    // Call the server side function AFTER the connection has been started
    chat.send('Hello World');
});

    Hope this helps!

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