socketio client fails to load

Question

im currently building a flask application which uses websockets. For this i would like to use the flask-socketio library. I have copied the client example as per the docs instructions:

<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/0.9.16/socket.io.min.js"></script>
<script type="text/javascript" charset="utf-8">
    var socket = io.connect('http://' + document.domain + ':' + location.port);
    socket.on('connect', function() {
        socket.emit('hello', {data: 'Hello there!'});
    });
</script>

and a simple server side handler:

@socketio.on('hello')
def handle_hello(message):
    print message

however i get the following error in the borwserwindow console:

Uncaught TypeError: Cannot read the property 'onClose' of null.

Anybody know what im doing wrong here?

Anum Sheraz · Accepted Answer · 2016-05-27 18:12:51Z

1

thats cuz you're fetching the wrong javascipt file for socket.io in your client app. change

<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/0.9.16/socket.io.min.js"></script>

to

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/1.4.6/socket.io.js">

answered May 27, 2016 at 18:12

Anum Sheraz

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vincentwang · Accepted Answer · 2016-09-19 01:18:32Z

0

I have encountered the same problem. The reason is not compatible with python module. You can try to install these versions.

gevent-1.1b1
greenlet-0.4.9
Flask-SocketIO-0.6.0

It's workd for me.

answered Sep 19, 2016 at 1:18

vincentwang

1

1 Comment

vincentwang Over a year ago

By the way, sockjs-1.1.0 have some problem. You can use sockjs-1.0.3 or sockjs-1.1.1

Quang Tran · Accepted Answer · 2017-03-03 08:30:08Z

0

I have the same problem, when i change version from 0.9.16 to 1.3.6 it worked for me.

<script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>

answered Mar 3, 2017 at 8:30

Quang Tran

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