Table of Contents
- Introduction
- Basic Questions
- 1. What is Angular JS?
- 2. What are the key features of Angular JS?
- 3. What are the advantages of using Angular JS?
- 4. How does data binding work in Angular JS?
- 5. Explain the concept of directives in Angular JS.
- 6. What is dependency injection in Angular JS?
- 7. How do you create a controller in Angular JS?
- 8. What is the difference between one-way and two-way data binding?
- 9. How do you handle form validation in Angular JS?
- 10. What are filters in Angular JS?
- 11. Explain the concept of routing in Angular JS.
- 12. What is the use of ng-repeat directive?
- 13. How do you handle HTTP requests in Angular JS?
- 14. What is the purpose of services in Angular JS? in bullet points
- 15. Explain the concept of scope in Angular JS.
- 16. How do you perform unit testing in Angular JS?
- 17. What is the role of ng-model directive in Angular JS?
- 18. What are the differences between AngularJS and Angular?
- 19. What is scope hierarchy?
- 20. What is an AngularJS module?
- 21. Why is $watch used?
- 22. Differentiate between ng-if and ng-show directives.
- 23. What is auto bootstrap process in AngularJS?
- 24. What is a singleton pattern and where can we find it in AngularJS?
- 25. What are the basic steps to unit test an AngularJS filter?
- 26. Explain ng-init directive.
- 27. How to make an AJAX call using AngularJS?
- 28. What is a factory method?
- 29. What are the differences between service and factory methods?
- 30. How do you handle exceptions in Angular JS?
- 31. What are AngularJS expressions?
- Intermediate Questions
- 1. How can you integrate AngularJS with HTML?
- 2. What is the restrict option in a directive?
- 3. On which types of components can we create a custom directive?
- 4. What is jQLite/jQuery Lite?
- 5. What is the difference between link and compile in AngularJS?
- 6. What is the role of ng-app, ng-init, and ng-model directives?
- 7. List out the scope characteristics in AngularJS
- 8. How can you reset a $timeout and disable a $watch()?
- 9. Is it possible for a parent controller to access the methods and properties of the child controller?
- 10. What is a digest cycle in AngularJS?
- 11. What is an interceptor? What are common uses of it?
- 12. Is AngularJS extensible?
- 13. How to implement internationalization in AngularJS?
- 14. Name the styling forms that ngModel adds to CSS classes.
- 15. What is the role of services in AngularJS, and name any services made available by default?
- 16. What are the different types of modules in AngularJS?
- 17. Explain the concept of transclusion in AngularJS.
- 18. What is the role of $rootScope in AngularJS?
- 19. How do you communicate between controllers in AngularJS?
- Advanced Questions
- 1. Can you define multiple restrict options on a directive?
- 2. Explain what is a linking function and the types of linking functions.
- 3. How do you achieve internationalization?
- 4. What is the difference between the $ and the $$ prefixes?
- 5. What are the lifecycle hooks available?
- 6. Explain how $scope.$apply() works?
- 7. How is the mouse double-click event accomplished?
- 8. Why is the findIndex() method used? What does it return in case the value is not found?
- 9. What can you tell about the given piece of code?
- 10. Write a syntax to send a sample HTTP POST request in AngularJS.
- 11. What is the importance of the $location service?
- 12. How is AngularJS compilation different from other JavaScript frameworks?
- 13. Explain the concept of watchers in AngularJS with examples.
- 14. How do you optimize performance in AngularJS?
- 15. How do you implement authentication in AngularJS?
- 16. What is the difference between the scopes of a directive and the scopes of a controller? Explain with an example.
- 17. How can you maintain logs in AngularJS?
- Coding Challenges
- 1. How will you hide an HTML tag element on the click of a button in AngularJS? Write a program for the same.
- 2. Create a simple AngularJS application to display a list of users from a JSON API.
- 3. Implement a search filter to filter a list of items based on user input.
- 4. Implement a form with validation to create a new user.
- 5. How do you disable a button depending on a checkbox’s state?
- 6. How would you make an Angular service return a promise?
- 7. When creating a directive, it can be used in several different ways in the view. Which ways for using a directive do you know? How do you define the way your directive will be used?
- 8. How would you implement application-wide exception handling in your Angular app?
- MCQ Questions
- 1. Which of the following is a JavaScript framework?
- 2. AngularJS is developed and maintained by which company?
- 3. AngularJS is based on which design pattern?
- 4. Which directive is used to bind the value of an input element to a property in the AngularJS controller?
- 5. Which directive is used to conditionally display an element based on an expression?
- 6. Which directive is used to repeat a set of HTML elements for each item in an array?
- 7. Which service is used to make HTTP requests in AngularJS?
- 8. In AngularJS, which symbol is used as a placeholder for data binding expressions?
- 9. Which directive is used to include an external HTML template file in AngularJS?
- 10. In AngularJS, what is the role of the $scope object?
- 11. In AngularJS, which directive is used to create custom reusable components?
- 12. What is the purpose of dependency injection in AngularJS?
- 13. Which of the following is NOT a valid way to declare a module in AngularJS?
- 14. What is the purpose of the $rootScope in AngularJS?
- 15. Which directive is used to handle user input events in AngularJS?
- 16. What is the purpose of the $watch function in AngularJS?
- 17. Which of the following is true about two-way data binding in AngularJS?
- 18. What is the purpose of the ng-init directive in AngularJS?
- 19. In AngularJS, how do you make an AJAX call to a server?
- 20. What is the purpose of the ng-model directive in AngularJS?
- 21. What is the purpose of the $injector service in AngularJS?
- 22. Which of the following is true about the digest cycle in AngularJS?
- 23. What is the purpose of the $compile service in AngularJS?
- 24. In AngularJS, what is the role of the $routeProvider?
- 25. What is the purpose of the $interpolate service in AngularJS?
- 26. What is the difference between $timeout and $interval in AngularJS?
- 27. What is the purpose of the ng-transclude directive in AngularJS?
- 28. Which of the following is true about filters in AngularJS?
- 29. What is the purpose of the $animate service in AngularJS?
- 30. What is the purpose of the $cacheFactory service in AngularJS?
Introduction
AngularJS is a popular JavaScript framework developed by Google for building dynamic web applications. If you’re preparing for an AngularJS interview, it’s essential to have a good understanding of the framework and its key concepts. This user-friendly introduction to AngularJS interview questions will help you grasp the basics and prepare for a successful interview.
AngularJS offers several advantages that make it a preferred choice for web development:
- Two-way data binding: AngularJS provides automatic synchronization between the model (data) and the view (UI), eliminating the need for manual DOM manipulation.
- Modular architecture: AngularJS promotes modular development through components, directives, and services, making it easier to manage and scale complex applications.
- Dependency injection: With AngularJS, you can easily inject dependencies into components, enabling better code organization, testability, and reusability.
- Reusable components: AngularJS allows you to create reusable components that encapsulate functionality and can be easily used across multiple parts of an application.
- Declarative templates: AngularJS uses HTML-based templates to define the UI, making it easier to understand and maintain the structure of your application.
- Powerful data manipulation: AngularJS provides built-in filters and directives for manipulating and formatting data, simplifying common tasks such as sorting, filtering, and data binding.
The AngularJS interview questions covered here are suitable for individuals with varying levels of experience, including:
- Beginners: If you’re new to AngularJS, these questions will help you gain a fundamental understanding of the framework and its core concepts.
- Intermediate Developers: If you have some experience with AngularJS and want to expand your knowledge, these questions will help you delve deeper into advanced topics and best practices.
- Experienced Developers: Even if you’re already proficient in AngularJS, these interview questions can serve as a valuable refresher and help you solidify your understanding of key concepts.
Whether you’re preparing for an entry-level AngularJS interview or aiming for a senior developer role, these questions will cover a range of topics to enhance your knowledge and boost your confidence during the interview process. Remember to practice implementing code examples and explanations to reinforce your understanding. Good luck with your AngularJS interview preparation!
Basic Questions
1. What is Angular JS?
AngularJS is a JavaScript-based open-source front-end web application framework developed by Google. It allows developers to build dynamic web applications by extending the functionality of HTML and providing a structured approach to application development. AngularJS follows the model-view-controller (MVC) architectural pattern and provides a set of tools and features for building single-page applications.
2. What are the key features of Angular JS?
- Two-way data binding
- Directives for extending HTML syntax
- Dependency injection for managing components
- Templating and declarative user interface
- Modular structure with reusable components
- Routing for building single-page applications
- Testing support with unit testing and end-to-end testing frameworks
- AJAX and RESTful API integration
- Form validation and error handling
- Internationalization and localization support
3. What are the advantages of using Angular JS?
- Enhanced productivity with declarative code and reusable components
- Two-way data binding simplifies the synchronization between UI and data models
- Modular architecture promotes code organization and maintainability
- Dependency injection enables easier testing and component isolation
- Powerful built-in features for form validation and error handling
- Efficient data binding and change detection mechanism
- Large and active community support with extensive documentation
- Seamless integration with other libraries and frameworks
- Improved performance through optimized rendering and caching
4. How does data binding work in Angular JS?
Data binding in AngularJS allows automatic synchronization of data between the model and the view. There are two types of data binding:
- One-way data binding: Changes in the model (JavaScript variables) are reflected in the view (HTML), but not vice versa. It is denoted by
{{ expression }}
in HTML templates.
Example:<span>{{ message }}</span>
- Two-way data binding: Changes in the model are immediately propagated to the view, and vice versa. It uses the
ng-model
directive for two-way binding.
Example:<input type="text" ng-model="name">
AngularJS uses a dirty checking mechanism to detect changes in the model and update the view accordingly. When a user interacts with the UI, the changes are automatically propagated to the model and vice versa, ensuring synchronization between the two.
5. Explain the concept of directives in Angular JS.
Directives in AngularJS are markers or attributes added to HTML elements that extend the functionality of HTML and define reusable components. They allow developers to create custom HTML tags and attributes, manipulate the DOM, attach behavior to elements, and encapsulate complex UI logic.
Directives can be used for various purposes, such as data binding, event handling, manipulating the DOM, rendering dynamic content, and creating reusable components.
Example of a directive usage:
<my-directive></my-directive>
AngularJS provides several built-in directives like ng-model
, ng-repeat
, ng-if
, etc., and allows developers to create custom directives to suit specific application requirements.
6. What is dependency injection in Angular JS?
Dependency injection (DI) in AngularJS is a design pattern that allows components to be loosely coupled and makes it easier to manage dependencies between them. In DI, the dependencies of a component are provided from external sources, rather than being created within the component itself.
AngularJS provides an injector subsystem that resolves and injects dependencies automatically. Components declare their dependencies, and the injector takes care of providing the required dependencies when the component is instantiated.
Example of dependency injection in a controller:
app.controller('MyController', ['$scope', 'userService', function($scope, userService) {
// $scope and userService are injected dependencies
// Controller logic goes here
}]);
Dependency injection promotes modular and reusable code, improves testability, and enables easier component isolation and substitution.
7. How do you create a controller in Angular JS?
In AngularJS, controllers are used to define the behavior and logic of a specific part of the application. To create a controller, follow these steps:
- Define the controller function and its logic:
app.controller('MyController', ['$scope', function($scope) {
// Controller logic goes here
}]);
- Attach the controller to a specific HTML element using the
ng-controller
directive: