Change the script load to <script src="/signalr/hubs"></script>
(note the initial forward slash) so it loads from the root rather than relative to the current directory.
Unable to get property 'chatHub' of undefined or null reference with signal R
-
16-07-2023 - |
質問
I know that this question has been asked multiple times but I tried all the solutions given and none seem to fit my problem.
I am getting the following error :
0x800a138f - JavaScript runtime error: Unable to get property 'chatHub' of undefined or null reference.
The error come randomly, sometime when I run my webapp it happens, sometime it doesn't and I am able to run my app and use the hub normally.
Script in Index page:
@section scripts
{
<script src="Scripts/jquery.signalR-2.0.3.js" type="text/javascript"></script>
<script src="signalr/hubs" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
var chatHub = $.connection.chatHub;
chatHub.client.add = function (message) {
$('#listMessages').append('<li>' + message + '</li>');
};
$.connection.hub.start().done(function () {
$('#SendMessage').click(function () {
var message = $('#txtMessage').val();
chatHub.server.send($('#who').val(), message);
$('#listMessages').append('<li>' + 'You said : ' + message + '</li>');
})
});
})
</script>
}
The layout is the default layout for internet MVC app from visual studio which contains :
@Scripts.Render("~/bundles/jquery")
My simple hub :
[HubName("chatHub")]
public class ChatHub : Hub
{
public void send(string sendTo, string message)
{
base.Clients.Group(sendTo).add(Context.User.Identity.Name + " said : " + message);
}
public override Task OnConnected()
{
base.Groups.Add(Context.ConnectionId, Context.User.Identity.Name);
return base.OnConnected();
}
}
For some reason, I keep getting the error randomly. How can I fix it? Thanks!
Edit: After following the advice from DaveB, I used Fiddler to check and it seems like it is requesting for signalr/hubs not from /signalr/hubs but from /mycontroller/signalr/hubs which is not a valid address (same error for jquery-signalr js). How can I fix this ?
解決