Sencha Interview Questions and Answers

Last update: 15 Mar 2022, 18 Questions

Most Frequently Asked Sencha Interview Questions

Here in this article, we will be listing frequently asked Sencha Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

1. Differentiate Ext JS & Sencha Touch.

The Ext JS or Extended JavaScript is a JavaScript framework which can be used to develop web-based desktop applications with rich UI. However, the Sencha Touch framework is optimized to create web-based mobile applications such as smartphones and pads. This is the prime difference between these two.

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2. What is Sencha GXT?

It’s a comprehensive Java framework which can be used to build feature-rich web applications. The framework uses the GWT compiler. This allows developers to produce an application in Java and compile them into cross-platform HTML5 code which is highly optimized.

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3. What are the GUIs supported by Sencha Touch?
The GUIs supported by the Sencha Touch are:
  • CSS3 and HTML5 for higher flexibility.
  • I have enhanced touch events.
  • Excellent support for animations.
  • Easily scales to various resolutions for best compatibility with various Android and iPhones.

The question is asked in many Sencha Touch Interviews. Go through it twice and don’t miss it the next time you face this interview question.


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4. Name few most used Sencha tools.

These are the most user preferred Sencha tools, Sencha Inspector, Sencha Architect, Sencha Cmd, Sencha Themer, Sencha GXT, Stencils and Sencha IDE and Code Editor Plugins.

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5. Why is Sencha Cmd required?

Sencha Cmd is required to build Ext JS applications. It offers many useful lifecycle management features to best compliment your Sencha projects, such as ES6 transpilation, code minification, scaffolding, dynamic package loading, building generation for progressive web applications, and more.

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6. Explain the workability of Sencha IDE and Code Editor Plugins.

Sencha IDE and Code Editor Plugins are used to integrate enterprise Sencha frameworks into users’ enterprise workflow. The Plugins are extremely useful and offer code inspection, code completion, template generation, refactoring, code generation, code navigation and more. It works with Sencha framework classes, custom user classes and overrides.

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7. What is Sencha Themer?

The Sencha Themer tool helps users to style Ext JS 6 applications with a better user interface. Custom themes can be created with it using graphical tools, without writing any code. App developers will get access to all Ext JS inspection tools and components to set fine-grained styles and generate dynamic stylesheet including theme packages.

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8. Why is the Sencha Architect tool used for?

This tool empowers app developers to build HTML5 applications merely using drag and drop features. This saves a lot of valuable project time for developers which they use for manual coding. The code available here is also optimized to achieve high-level performance.

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9. What is the Sencha Inspector tool?

It’s a debugging tool used to get direct access for classes, components and more for applications using the Sencha framework. The Sencha Inspector tool lets developers analyze their code for issues and eventually helps in improving the performance of applications.

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10. Why is Sencha MVC used?

The app developers use Sencha MVC to separate the control code, the application data, and view. This separation helps large scale web applications to be flexible and maintain easily.

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11. What is Stencils?

It’s a complete UI asset kit available for Sketch, Adobe Illustrator and Balsamiq. The package is also available as PNG/SVG so that it can be used with other programs. Stencils contain all of the styles and components used in the Ext JS Classic, ExtReact components and Modern toolkits.

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12. What is the latest version of Ext JS and how it’s associated with the Sencha Touch?

The Ext JS 6th is the latest version which merges both Ext JS used to create web desktop applications and Sencha touch used for mobile applications. The newest version offers app developers a single platform where they create both mobiles as well as desktop applications.

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13. What is x-Credit?

x-Credit is a virtual form used to meter Support Tickets or request other assistance available under the Sencha support plan. At the time of buying a Sencha support plan, the user will be provided with a certain number of x-Credit balance. The premium support plans of Sencha do not use any x-Credits.

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14. Explain a few drawbacks of using Sencha Touch.
With the use of Sencha Touch, the developers will face the following drawbacks:

The API doesn’t have access to any devices’ contacts, camera and accelerometer sensor.


Users don’t get push notification facility. They have to use long polling or web sockets to avail this.


According to its general public license policy, Sencha Touch is free for all open source applications; however commercial applications will need paid subscriptions.


It’s not appropriate for extreme animation and graphics apps such as gaming applications.


Point to be noted: The question mentioned above has always been a favorite question of Interviewers. This is among the best Sencha Touch Interview Question and Answers for both fresher and experienced as well.

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15. What if your embedded device has a browser built in?

Distribution of Sencha Touch applications is free of charge through a general-purpose browser, regardless of device. Thus, an embedded license will not be required. The general purpose web browser has a general browser “Chrome” and a URL bar.

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16. Mention the type of data integration available in Sencha Touch.
The following types of data integration are available with Sencha Touch:
  • AJAX
  • Data Integration
  • YQL
  • Offline data save with local storage writers
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17. Explain the term Naming convention.

It’s a set of rules to be followed by the identifiers. The Naming convention also makes the code readability easy and understandable for other programmers. Sencha Touch’s Naming convention follows the standard JS convention, which a good practice but not mandatory.

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18. What are the advantages of using Sencha Touch?
The following are the advantages of using Sencha Touch:
  • Responsive touch features
  • Excellent device API features
  • Budget suited solution
  • Native application packaging
  • A greater level of compatibility
  • Quick & time-saving operation

These Sencha Interview Question for both Experienced and Freshers. To know more details about it, get in touch with us.

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