Question 1

What is Ext JS?

Accepted Answer

Ext JS is a powerful and comprehensive JavaScript framework for building data-intensive, cross-platform web applications with a rich user interface. It provides a wide range of pre-built UI components, data handling capabilities, and a robust architecture to streamline the development process.

Question 2

What does Ext JS stand for?

Accepted Answer

Ext JS stands for 'Extended JavaScript.' It’s a comprehensive JavaScript framework developed by Sencha for building comprehensive web and mobile applications.

Question 3

When should you use Ext JS?

Accepted Answer

Ext JS is a suitable choice when you need to develop complex web applications with rich user interfaces and extensive features. It excels in creating data-intensive, cross-platform applications that require advanced UI components and a structured architecture.

Question 4

Can you build SPAs with Ext JS?

Accepted Answer

Yes, Ext JS can be used to build single-page applications (SPAs). It provides the necessary tools and components to create modern SPAs with dynamic content loading and seamless user experiences.

Question 5

Can Ext JS handle large applications?

Accepted Answer

Yes, Ext JS is designed to handle large and complex applications. Its modular architecture and component-based approach facilitate the development of scalable applications that can manage a high volume of data and interactions. Ext JS data grid is a leading JavaScript Grid that can handle millions of records efficiently. Moreover, it offers advanced grid features, such as grouping, filtering, sorting, infinite scrolling, row selection, paging, live data rendering, and more.

Question 6

Does Ext JS support building mobile apps?

Accepted Answer

Yes, Ext JS offers tools and components for building responsive and mobile-friendly applications. It provides a responsive layout system and touch-optimized UI components for creating cross-platform mobile apps.

Question 7

Can I build desktop applications with Ext JS?

Accepted Answer

Yes, Ext JS can be used to build desktop applications as well. With its powerful UI components and layout system, you can create applications that run on both web browsers and desktop environments.

Question 8

Can I use Ext JS in an existing project?

Accepted Answer

Yes, you can integrate Ext JS into existing projects. It offers flexibility and can be introduced incrementally, allowing you to leverage its components and features while integrating them into your current application.

Question 9

How do you unit test Ext JS apps?

Accepted Answer

Ext JS provides a testing framework called Sencha Test that facilitates unit testing of your applications. Sencha Test allows you to write tests to verify the behavior of Ext JS components and ensure the robustness of your codebase.

Question 10

Why should I use Ext JS instead of a framework like React or Angular?

Accepted Answer

Ext JS is a comprehensive framework that provides a wide range of UI components, tools, and features out of the box. It's a suitable choice when you need an integrated solution for building data-intensive applications with complex UI requirements.

Question 11

How is Ext JS different from Angular?

Accepted Answer

While both Ext JS and Angular are JavaScript frameworks, Ext JS offers a more extensive set of UI components and a comprehensive feature set. Ext JS follows a component-driven approach, whereas Angular relies on a more modular and declarative architecture.

Question 12

How is Ext JS different from React?

Accepted Answer

Ext JS and React differ in their approaches. Ext JS is a full-fledged framework that includes UI components and tools for building applications, while React focuses on the UI layer and works well in combination with other libraries or frameworks to build complete applications.

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