programmatically change xtype prototype config options

Question

Is it possible to change xtype and user defined xtypes config options programmatically? After doing so, all instances of xtype would have these config options.

I want to be able to define defaults to certain xtypes before being instantiated. These defaults depend on an application setting (maxLength,visible,vtype)

I dont want to iterate through instantiated components and set the property.

Thanks.

Answer 1

It looks like you can as long as you didn't override the defaults as part of the object's instantiation. See http://jsfiddle.net/WteqQ/2/

Ext.define('Custom', {
    xtype: 'custom',
    defaultProp: 'default',
    defaultProp2: 'default2',
    customFn1: function () {
        alert(1);
    }
});

var a = new Custom();
a.defaultProp2 = 'overridden default';
a.customFn1();        //alerts 1
alert(a.defaultProp); //alerts default
alert(a.defaultProp2);//alerts overridden default
//a.customFn2();      //would throw error

Ext.define('Custom.Override', {
    override: 'Custom',
    defaultProp: 'new default',
    customFn1: function () {
        alert(2);
    },
    customFn2: function () {
        alert(3);
    }
});

a.customFn1();        //alerts 2
a.customFn2();        //alerts 3
alert(a.defaultProp); //alerts new default
alert(a.defaultProp2);//alerts overridden default

Although this works, I think it would be better to have your application settings applied before you instantiate your components.