Node JS event not firing

I am trying to create an event fire in my node JS code but cannot figure out why it is not.

I have a module like this:

var zookeeper = require('node-zookeeper-client'),
    events = require('events'),
    util = require('util');
var client;

var KafkaZookeeperMonitor = function(){
    events.EventEmitter.call(this);  
}

util.inherits(KafkaZookeeperMonitor, events.EventEmitter);

KafkaZookeeperMonitor.prototype.connectToZk = function(zookeepers){
    client = zookeeper.createClient(zookeepers);
    client.connect();

    client.once('connected', function () {
        console.log('Connected to ZooKeeper');
        this.emit('connected');
    });
}

module.exports = KafkaZookeeperMonitor;

      

        
        
        
      

    

and I am calling it from my index.js file like this:

var KafkaZookeeperMonitor = require('./kafkaZookeeperMonitor'),
    kafkaStatus = new KafkaZookeeperMonitor(),
    brokerPath = '/brokers/ids';

kafkaStatus.connectToZk('192.168.50.252:2181');

kafkaStatus.once('connected', function(){
    console.log('watcher connected to Zookeeper');
})

      

        
        
        
      

    

When I run the code, I get a log message

'Connected to Zookeeper'

but this.emit('connected');

doesn't seem to work.

I have looked online and I think I am setting my event emitter correctly. Can anyone help me where I may have gone wrong here?

thank