SignalR cannot read property client of undefined

问题

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.

I've read a lot of stackoverflow posts but none of them is resolving my issue.

This is what I did so far:

1) Ran Install-Package Microsoft.AspNet.SignalR -Pre
2) Added RouteTable.Routes.MapHubs(); in Global.asax.cs Application_Start()
3) If I go to http://localhost:9096/Gdp.IServer.Web/signalr/hubs I can see the file content
4) Added <modules runAllManagedModulesForAllRequests="true"/> to Web.Config
5) Created folder Hubs in the root of the MVC application
6) Moved jquery and signalR scripts to /Scripts/lib folder (I'm not using jquery 1.6.4, I'm using the latest)

This is my Index.cshtml

<h2>List of Messages</h2>

<div class="container">
    <input type="text" id="message" />
    <input type="button" id="sendmessage" value="Send" />
    <input type="hidden" id="displayname" />
    <ul id="discussion">
    </ul>
</div>

@section pageScripts
{
    <!--Reference the SignalR library. -->
    <script src="@Url.Content("~/Scripts/jquery.signalR-1.0.0-rc1.min.js")" type="text/javascript"></script>
    <!--Reference the autogenerated SignalR hub script. -->
    <script type="text/javascript" src="~/signalr/hubs"></script>
    <script src="@Url.Content("~/Scripts/map.js")" type="text/javascript"></script>
}

This is my IServerHub.cs file (located inside Hubs folder)

namespace Gdp.IServer.Ui.Web.Hubs
{
    using Microsoft.AspNet.SignalR.Hubs;
    [HubName("iServerHub")]
    public class IServerHub : Hub
    {
        public void Send(string name, string message)
        {
            Clients.All.broadcastMessage(name, message);
        }
    }
}

And this is map.js

$(function () {

    // Declare a proxy to reference the hub. 
    var clientServerHub = $.connection.iServerHub;

    // Create a function that the hub can call to broadcast messages.
    clientServerHub.client.broadcastMessage = function (name, message) {
        $('#discussion').append('<li><strong>' + name + '</strong>:&nbsp;&nbsp;' + message + '</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 () {
            // Html encode display name and message. 
            var encodedName = $('<div />').text($('#displayname').val()).html();
            var encodedMsg = $('<div />').text($('#message').val()).html();

            // Call the Send method on the hub. 
            clientServerHub.server.send(encodedName, encodedMsg);

            // Clear text box and reset focus for next comment. 
            $('#message').val('').focus();
        });
    });
});

The DLL's I see references for SignalR are:

Microsoft.AspNet.SignalR.Core
Microsoft.AspNet.SignalR.Owin
Microsoft.AspNet.SignalR.SystemWeb

Any ideas how to get it work? Should I make any change because the scripts are in /Script/lib folder?

NOTE I'm following the instruction found here on how to set up Windsor Castle to make it work with SignalR, and again, seems that the proxy cannot be created and I'm getting the same error:

Cannot read property client of undefined

meaning that the proxy to the hub was not created

This is how I have it in the server

public class IncidentServerHub : Hub

and like this in the client

var clientServerHub = $.connection.incidentServerHub;

Again, I can see the dynamically created file here:

/GdpSoftware.Server.Web/signalr/hubs

So, Why the proxy is not created?

Thanks in advance!!! Guillermo.

回答1:

I fixed that problem by changing my js code from: var myHub = $.connection.SentimentsHub; to var myHub = $.connection.sentimentsHub;

So if you have some hub with class name TestHub you must use testHub(first letter is lowercase) name in js

回答2:

For those who tried to add the generated proxy file path in the bundle.

Do not include the "~/signalr/hubs" in your BundleConfig.cs.

You can have the JQuery.SignalR in the bundle:

bundles.Add(new ScriptBundle("~/bundles/signalr").Include(
                  "~/Scripts/jquery.signalR-{version}.js"));

But you will need to add "/signalr/hubs" it in your view:

@section Scripts {
    @Scripts.Render("~/bundles/signalr")
    @Scripts.Render("/signalr/hubs")
}

I hope this helps.

回答3:

I had the same error message and resolved the issue by fixing a typo I had in the [HubName] attribute on the hub class - it was not exactly matching the property in the client-side javascript.

C# hub class:

[HubName("gameHub")]
public class GameHub : Hub
{

client-side javascript:

var foo = $.connection.gameHub;

"gameHub" must be the same.

hth

回答4:

For ASP.Net MVC folks:
Check your _Layout.cshtml
If you are calling the jquery bundle after the "@RenderBody()", you will get this error.
Resoultion: Just move the "@Scripts.Render("~/bundles/jquery")" to the head section or write all signalr scripts in the scripts "section"

回答5:

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

class ChatHub : Hub

should actually be

public class ChatHub : Hub

回答6:

Ok, I've found the issue, one thing I needed to do was:

These two references were missing:

Microsoft.AspNet.SignalR.Hosting.AspNet
Microsoft.AspNet.SignalR.Hosting.Common

Now, I included them getting nuget package: WebApiDoodle.SignalR which uses those two. My question is why those Dlls weren't added one I installed the Nuget Package: Microsoft.AspNet.SignalR -Pre?

Bug?

Then I had this in my global.asax.cs

using SignalR;

RouteTable.Routes.MapHubs();

was using that one, I needed to remove that using and use this one:

using Microsoft.AspNet.SignalR;

So the MapHubs use that one, and started to work.

Hope this helps others. Guillermo.

回答7:

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>

回答8:

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

回答9:

In my case, I lost Microsoft.Owin.Host.SystemWeb.dll & Microsoft.Owin.Security.dll in my project. After adding References to them, that error was solved. it's working now.

来源：https://stackoverflow.com/questions/14146913/signalr-cannot-read-property-client-of-undefined

标签

signalr

signalr-hub

signalr.client