In this chapter, we have covered the details in high level about the application we will implement throughout the chapters of this book. We have also covered all the requirements to create the development environment for this application. We learned how to create the initial structure of an Ext JS MVC application.
And we also learned, through examples, how to create a splash screen (also known as the loading screen) manipulating DOM using the Ext.dom.Element class. We learned the difference between using Ext.onReady and Ext.application and also the difference between the init and launch methods from Ext.application. We left the app.js file ready to display its first screen, which will be a login screen, which we will learn how to implement in the next chapter.