Example with Ext.ux.Deferred

Ext.ux.Deferred

var dfd1 = Ext.create('Ext.ux.Deferred'),
    dfd2 = Ext.create('Ext.ux.Deferred'),
    dfd3 = Ext.create('Ext.ux.Deferred');

Ext.Ajax.request({
  url: 'your/url',
  success: function (data) {
    dfd1.resolve(data);
  },
  failure: function (err) {
    dfd1.reject(data);
  }
});

Ext.Ajax.request({
  url: 'your/url2',
  success: function (data) {
    dfd2.resolve(data);
  },
  failure: function (err) {
    dfd2.reject(data);
  }
});

Ext.Ajax.request({
  url: 'your/url3',
  success: function (data) {
    dfd3.resolve(data);
  },
  failure: function (err) {
    dfd3.reject(data);
  }
});

Ext.ux.Deferred.when(dfd1, dfd2, dfd3).then(function (data1, data2, data3) {
  console.log(data1, data2, data3);
}, function (err1, err2, err3) {
  console.log(err1, err2, err3);
});