Node.js Design Patterns by Mario Casciaro

By Mario Casciaro

If you're a JavaScript developer attracted to a deeper figuring out of ways to create and layout Node.js purposes, this can be the e-book for you.

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This class encapsulates a DOM (Document Object Model) element where we can manage using the class's methods. This class is part of the Ext Core library, which is part of the foundation of Ext JS framework. Summary 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.

Console command editor is a great tool and using it can save us a lot of time when trying to find the exact selector that we want, instead of coding, testing, not the selector we want, code again, test again, and so on. Could we use only button#submit or button#cancel as selectors? Yes, we could use a shorter selector. However, it would work perfectly for now. As the application grows and we declare many more classes and buttons, the event would be fired for all buttons that have the itemId named submit or cancel and this could lead to an error in the application.

For example, we can have a class named MyWindow1, extending from window and inside this class we can have a button with item ID submit. Then we can have another class named MyWindow2, also extending from window, and also with a button with item ID submit. [ 43 ] The Login Page Having two item IDs with the same value is not an issue. ComponentQuery to retrieve the component we want. For example, if we have a Login window whose alias is login and another screen called the Registration window whose alias is registration.

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