How to call controller method from Html element click

I got idea like i would like to show some forms while am click on HTML label , Calling Extjs viewController from HTML DOM element tried to add click event to fetch the controller but didnt worked that.

Then i realized after rendering that DOM i will add function to that elementt click function. The code will like below.

This is the code of HTML text from JSON object.

<label id='lblShowDep'>Privacy Policy</label>

After rendering adding the controller method to that DOM Element

if(Ext.get('lblShowDep')){

     Ext.get('lblShowDep').on('click', function() {

           controller.onClickShowDep();

      });

}