ondrain property is used to specify an event handler to receive
drain events. Those events are triggered each time buffered data are flushed to the network.
instanceOfTCPSocket.ondrain = funcRef
funcRef is a function to be called when the
drain event occurs.
This callback function will get a TCPSocketEvent object as its first parameter.
TCPSocketobject which fired the event.
- A string defining the type of the event. Its value can be one of the following:
- The data related to the event, if any.