How to load controller dynamically on particular event call in extjs4?

Question

I am working in extjs4.I am getting stuck at a point where I want to load controller dynamically in extjs4.I am using controllers this.getController() method to load controller dynamically. *When I am placing this code in init() function of particular controller then it works and controller get loaded dynamically.*Here is my controller code...

Ext.define('B.UserController',{ 
----
init:function()
{
    var controller = this.getController('kp.PollController');
    controller.init();                  // launch init() method
    this.control(
            {
                 'KpLogin button[action=loginAction]':
                      {
                          click:this.authenticateUser
                      },
            });
},
-----

But when I am placing my code in particular function(buttons event) then it gives me error. Here is my code...

    Ext.define('B.UserController',{  
    -------   
    init:function()
    {
            this.control(
                {
                     'KpLogin button[action=loginAction]':
                          {
                              click:this.authenticateUser
                          },
                });
    },
     authenticateUser:function(button)
    {
      var controller = this.getController('kp.PollController');
      controller.init();                  // launch init() method
    }
    -----

After placing this code in then I got error in firebug...

Uncaught TypeError: Cannot read property 'readyState' of undefined Connection.js:818
Ext.define.onStateChange Connection.js:818
(anonymous function) 

Here is my app.js code....

Ext.application({
    name:'B',
    autoCreateViewport:true,
    controllers:['sn.UserController','qb.QbquestionController','kp.DnycontentController',/*'kp.PollController','kp.PolloptionController',*/'kp.KpquotationController','qb.QbqnsController','kp.CuriosityquestionController','kp.WordController','kp.DnycontentcategoriesController'],
    launch:function()
    {
        console.log('Application launch');  
    },//End of launch function
     });

I dont know whats going wrong.Please give me some suggestions....

Answer 1

You can put below code in the authenticateUser function

authenticateUser:function(button) {
    var app = this.getApplication(),
        controller = Ext.create('kp.PollController', {
            application: app
    });
    app.getControllerInstances()['kp.PollController'] = controller;
    controller.init();
}