def on_event(self, message, handler, namespace=None):
"""Register a SocketIO event handler.
``on_event`` is the non-decorator version of ``'on'``.
Example::
def on_foo_event(json):
print('received json: ' + str(json))
socketio.on_event('my event', on_foo_event, namespace='/chat')
:param message: The name of the event. This is normally a user defined
string, but a few event names are already defined. Use
``'message'`` to define a handler that takes a string
payload, ``'json'`` to define a handler that takes a
JSON blob payload, ``'connect'`` or ``'disconnect'``
to create handlers for connection and disconnection
events.
:param handler: The function that handles the event.
:param namespace: The namespace on which the handler is to be
registered. Defaults to the global namespace.
"""
self.on(message, namespace=namespace)(handler)
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