I am getting an undefined connection id in signalr javascript client

问题

According to all documentation that i have come across i should be able to call $.connection.hub.id AFTER my connection has been started. this is my code:

    var handshake = $.connection.handshakeHub;
    $.connection.hub.start().done(function () {
        console.dir($.connection.hub);
        console.log('connection started with id: ' + $.connection.hub.id);
        self.parentConnectionId = document.cookie.replace(/(?:(?:^|.*;\s*)connection\s*\=\s*([^;]*).*$)|^.*$/, "$1");
        handshake.server.connect(self.parentConnectionId, $.connection.hub.id);
    });

I am successfully connecting and the handshake proxy connect call hits the server so it is not like the connection is bombing. I have also inspected the property in the dev tools after the connection and the ID is still undefined.

I have tried this with version 2.1 and 2.2 of Signalr and no luck. Anyone have any experience with this? This is killin me.

回答1:

For anyone else that may have been googling/searching this (like me), ensure you've started your hub and it's connected.

$.connection.hub.start().done(function () {
    console.log("id : %o", $.connection.hub.id);
});

回答2:

I am an idiot. I had the proxy script tag included in two different spots in my solution. Removing one fixed the issue.

来源：https://stackoverflow.com/questions/27989445/i-am-getting-an-undefined-connection-id-in-signalr-javascript-client