Create ExtJs extend class

Question

I try to extend Button like in sencha example.
I do fiddle
And get error: TypeError: this.addEvents is not a function : 'statesave'.
Whats wrong?

Answer 1

You just forgot to call new and you had a typo see JSFiddle

PuffButton = Ext.extend(Ext.Button,{
    constructor: function(config){
        PuffButton.superclass.constructor.apply(this,arguments);
        console.log("111111");
        this.on('click',function(){this.el.puff();},this);
    }
});
var puff = new PuffButton({text: 'Puff', renderTo:Ext.getBody()});