websocket helper, managing websocket events and callbacks

websocket_helper.js

var ws = new WebSocket("ws://localhost:8080/");
ws.onopen = function() {
  this.send(JSON.stringify({event: "init",data: { c_wid: "51396e790662720c10000002" } }));
};
ws.onmessage = function(evt){
  var json = JSON.parse(evt.data);
  console.log(json);
  this.dispatch(json.event, json.data);
};

var callbacks = {};

ws.dispatch = function(event_name, message){
  console.log(event_name, message);
  if(event_name=='init'){ return;}
  var chain = callbacks[event_name];
  if(typeof chain == 'undefined') return;
  for(var i = 0; i < chain.length; i++){
    chain[i]( message );
  }
};

ws.launch = function(event_name, event_data,callback){
  var payload = JSON.stringify({event:event_name, data: event_data});
  callbacks[event_name] = callbacks[event_name] || [];
  callbacks[event_name].push(callback);
  this.send(payload);
};


var data = {some: 'data'};
// Usage
ws.launch("submit", data, function(data){ console.log(data);});