ExtJS - Remove Listeners

• As adding the listeners , Listeners can be removed from Extjs.
• Calling function ON() with the event will be creating the event.
• Below example explains how to remove the listener using UN() method.

var sayHello = function() {
   alert('Hello');
};

var button = Ext.create('Ext.Button', {
    renderTo: Ext.getBody(),
    text: 'Say Hello',
    listeners: {
        click: sayHello,
    }
});

button.un('click', sayHello);