What is and Ext class?

What is and Ext class?

Summary. This is a low level factory that is used by Ext. define and should not be used directly in application code. The configs of this class are intended to be used in Ext.

How do you define new class in Ext JS?

As per the syntax of Ext. define, the first parameter ‘Student’ is class name. The second parameter is a JavaScript object which contains name and getName(), and the third parameter (optional) is callback function which will be called after ‘Student’ class is created. So this way you can create custom class in Ext JS.

Which is the root class of all classes created with ext define?

The root of all classes created with Ext. define. Ext. Base is the building block of all Ext classes.

What is the difference between a class and Ext JS?

A Class can be defined as an extensible program code-template that helps to create the objects, provides initial value for the member variables, and implement the behavior of methods and member functions. In Ext JS, Ext is used as a namespace that is used to encapsulate the classes in Ext JS. Ext JS framework contains its own class system.

How do I extend an existing class in ExtJS?

Ext.define (‘MyApp.form.field.CornField’, extend: ‘Ext.form.field.Text’, alias: ‘widget.cornfield’, initComponent: function () { this.callParent (arguments); this.setValue (‘Corn!’); } ); ExtJS provides two main ways to change the behavior of existing classes: extending them, and overriding them.

What is Ext JS UI (user interface) components?

The Ext JS UI (User Interface) components are extracted from Ext. Components class. Ext.Component class is also extracted from the Ext.Base class.

How many classes does extext JS ship with?

Ext JS ships with hundreds of classes. We have more than 2 million developers to date and they come from various backgrounds and locations. At that scale, we face a big challenge in providing a common code architecture that is: Because JavaScript is a classless, prototype-oriented language, one of its most powerful features is flexibility.