Extend Class second time sencha touch 2

Question

I've extended my utility/class in Sencha Touch 2, now I want to extend it again by different type such that by different settings in config object. Ive extended it again but when it is extended just (by just adding extend: 'Ext.ux.MyUX' again) it returns the previious settings in the previous object, but I want to handle it totally differently. How can I remove the previous extended class or empty that items[].

Ext.define('MyAPP.view.MyView', {
    extend: 'Ext.ux.MyUX',
    xtype: 'my',
});

My Code:

initialize: function() {
var items = [
            xtype: 'toolbar',
            docked: 'top',
            title:'title'
        }];
this.setItems(items);
}

EDIT 1:

Lets say, I've a following config object extending my Ext.ux.MyUX. for the first instance its working perfectly, extending my class and override the items[] but when I want to extend it again, such that for different overriding, it shows the previous items[] that overrided/extended previously.

config: {
        fullscreen: true,
        items : [
        {
            title: 'Home'
        },
        {
            title: 'ABOUT',
            items: [{
                items: [
                { xtype: 'about'},
            {
                xtype: 'titlebar',
                title: 'About Us',
                docked: 'top'
            }]
            }]
        }

        ]
    }

From the description alone, I have no idea what you want to achieve and what is the problem. So I hope I understand from the code. — Saki

Saki Saki · Accepted Answer · 2015-02-08T20:24:39

Having items in a class prototype is not a very good idea even if you don't plan to extend the class further. Complex variables from prototype are shared by all instances that inevitably leads to troubles if you have more than one instance.

Be you I'd create a base class that would contain all functionality needed by descendants and I'd extend that:

B -> C
B -> D

instead of

B -> C -> D

Descendants would implement items as needed.

Extend Class second time sencha touch 2

2 Answers