Ext_Class.configs

List of short aliases for class names. Most useful for defining xtypes for widgets:

Ext.define('MyApp.CoolPanel', {
    extend: 'Ext.panel.Panel',
    alias: ['widget.coolpanel'],
    title: 'Yeah!'
});

// Using Ext.create
Ext.create('widget.coolpanel');

// Using the shorthand for defining widgets by xtype
Ext.widget('panel', {
    items: [
        {xtype: 'coolpanel', html: 'Foo'},
        {xtype: 'coolpanel', html: 'Bar'}
    ]
});

Besides "widget" for xtype there are alias namespaces like "feature" for ftype and "plugin" for ptype.

Defines alternate names for this class. For example:

Ext.define('Developer', {
    alternateClassName: ['Coder', 'Hacker'],
    code: function(msg) {
        alert('Typing... ' + msg);
    }
});

var joe = Ext.create('Developer');
joe.code('stackoverflow');

var rms = Ext.create('Hacker');
rms.code('hack hack');

List of configuration options with their default values, for which automatically accessor methods are generated. For example:

Ext.define('SmartPhone', {
     config: {
         hasTouchScreen: false,
         operatingSystem: 'Other',
         price: 500
     },
     constructor: function(cfg) {
         this.initConfig(cfg);
     }
});

var iPhone = new SmartPhone({
     hasTouchScreen: true,
     operatingSystem: 'iOS'
});

iPhone.getPrice(); // 500;
iPhone.getOperatingSystem(); // 'iOS'
iPhone.getHasTouchScreen(); // true;

NOTE for when configs are reference types, the getter and setter methods do not make copies.

For example, when a config value is set, the reference is stored on the instance. All instances that set the same reference type will share it.

In the case of the getter, the value with either come from the prototype if the setter was never called or from the instance as the last value passed to the setter.

For some config properties, the value passed to the setter is transformed prior to being stored on the instance.

The parent class that this class extends. For example:

Ext.define('Person', {
    say: function(text) { alert(text); }
});

Ext.define('Developer', {
    extend: 'Person',
    say: function(text) { this.callParent(["print "+text]); }
});

List of inheritable static methods for this class. Otherwise just like statics but subclasses inherit these methods.

List of classes to mix into this class. For example:

Ext.define('CanSing', {
     sing: function() {
         alert("I'm on the highway to hell...")
     }
});

Ext.define('Musician', {
     mixins: ['CanSing']
})

In this case the Musician class will get a sing method from CanSing mixin.

But what if the Musician already has a sing method? Or you want to mix in two classes, both of which define sing? In such a cases it's good to define mixins as an object, where you assign a name to each mixin:

Ext.define('Musician', {
     mixins: {
         canSing: 'CanSing'
     },

     sing: function() {
         // delegate singing operation to mixin
         this.mixins.canSing.sing.call(this);
     }
})

In this case the sing method of Musician will overwrite the mixed in sing method. But you can access the original mixed in method through special mixins property.

List of classes that have to be loaded before instantiating this class. For example:

Ext.define('Mother', {
    requires: ['Child'],
    giveBirth: function() {
        // we can be sure that child class is available.
        return new Child();
    }
});

When set to true, the class will be instantiated as singleton. For example:

Ext.define('Logger', {
    singleton: true,
    log: function(msg) {
        console.log(msg);
    }
});

Logger.log('Hello');

List of static methods for this class. For example:

Ext.define('Computer', {
     statics: {
         factory: function(brand) {
             // 'this' in static methods refer to the class itself
             return new this(brand);
         }
     },

     constructor: function() { ... }
});

var dellComputer = Computer.factory('Dell');

List of optional classes to load together with this class. These aren't neccessarily loaded before this class is created, but are guaranteed to be available before Ext.onReady listeners are invoked. For example:

Ext.define('Mother', {
    uses: ['Child'],
    giveBirth: function() {
        // This code might, or might not work:
        // return new Child();

        // Instead use Ext.create() to load the class at the spot if not loaded already:
        return Ext.create('Child');
    }
});

Class type Ext_Class.configs