Getting 0x800a138f - Javascript Runtime Error: Unable To Get Property 'client' Of Undefined Or Null Reference

I'm making a chat application using SignalR API. I'm getting error as: 0x800a138f - JavaScript runtime error: Unable to get property 'client' of undefined or null reference Her

Solution 1:

You are referring to the client object of an undefined object. So I have been searching inside your code for

.client

These were the results:

chatHub.client.onConnected
chatHub.client.onNewUserConnected
chatHub.client.onUserDisconnected
chatHub.client.messageReceived
chatHub.client.sendPrivateMessage

So, if you look at the results, it becomes obvious that chatHub is undefined somewhere. This is how you initialize it:

var chatHub = $.connection.chatHub;

I wonder what is inside $.connection. Are you missing a script from your html?

Solution 2:

A couple of things...

You're using an old signalr version, have you tried upgrading to the latest?

Otherwise; I had a similar problem, I had to solve it by setting up the connection without the generated proxy (/signalr/hubs).

See this link http://www.asp.net/signalr/overview/guide-to-the-api/hubs-api-guide-javascript-client and instead of setting it as a "generated proxy", implement it without it. (Search for "Without the generated proxy")