Poller

poller.js

var poller = new Poller();
poller.intervals([1000, 5000, 10000])
  .checkback(function(callback) {
    // could be anything asynchronous
    $.getJSON('/is/server/ready', function(response) {
    if (response.ready) {
      callback(true);
    } else {  
      else callback(false);
    }
 })
 .callback(function() {
   // checkback succeded and the end of one interval
   // stops the poller and callback
   console.log('Ok')
 })
 .failback(function() {
   // after the third attempt, exits calling the failback
   // function
   console.log('Failed');
 })
 .start(); // start the process