AngularJS, the ‘Swiss army knife’ of the developer community, has been seeing exponential growth in popularity and career opportunities in the recent years. No surprises there, as the development framework is known for its ability to create single-page web applications that encompass three critical components – speed, agility and a strong community backing it up. AngularJS continues to dominate the arena of Javascript framework and has proved itself to be a worthy investment for web developers who seek to fast-track their career. To help you get started, we have compiled a list of the most frequently asked AngularJS interview questions that will help you ace the AngularJS interviews that come your way.

1. What is the difference between Angular and jQuery?

FeaturesjQueryAngular
DOM ManipulationYesYes
RESTful APINoYes
Animation SupportYesYes
Deep Linking RoutingNoYes
Form ValidationNoYes
2 Way Data BindingNoYes
AJAX/JSONPYesYes

2. Name the key features of AngularJS?

The key features of AngularJS are:

  • Scope
  • Controller
  • Model
  • View
  • Services
  • Data Binding
  • Directives
  • Filters
  • Testable

3. Explain data binding in AngularJS.

According to AngularJS.org, “Data-binding in Angular apps is the automatic synchronization of data between the model and view components. The way that Angular implements data-binding lets you treat the model as the single-source-of-truth in your application. The view is a projection of the model at all times. When the model changes, the view reflects the change and vice versa.”

There are two ways of data binding:

  1. Data mining in classical template systems
  2. Data binding in angular templates

4. What are directives in AngularJS?

A core feature of AngularJS, directives are attributes that allow you to invent new HTML syntax, specific to your application. They are essentially functions that execute when the Angular compiler finds them in the DOM.  Some of the most commonly used directives are ng-app,ng-controller and ng-repeat.

The different types of directives are:

  • Element directives
  • Attribute directives
  • CSS class directives
  • Comment directives

5. What are Controllers in AngularJS?

Controllers are Javascript functions which provide data and logic to HTML UI. As the name suggests, they control how data flows from the server to HTML UI.

6. What is Angular Expression? How do you differentiate between Angular expressions and JavaScript expressions?

Angular expressions are code snippets that are usually placed in binding such as {{ expression }} similar to JavaScript.

The main differences between Angular expressions and JavaScript expressions are:

  • Context: The expressions are evaluated against a scope object in Angular, while Javascript expressions are evaluated against the global window
  • Forgiving: In Angular expression, the evaluation is forgiving to null and undefined whereas in JavaScript undefined properties generate TypeError or ReferenceError
  • No Control Flow Statements: We cannot use loops, conditionals or exceptions in an Angular expression
  • Filters: In Angular, unlike JavaScript, we can use filters to format data before displaying it

7. What is the difference between link and compile in Angular.js?

  • Compile function is used for template DOM Manipulation and to collect all the directives.
  • Link function is used for registering DOM listeners as well as instance DOM manipulation and is executed once the template has been cloned.
Read More:   How to choose the right ecommerce platform

8. What are the characteristics of ‘Scope’?

Scope is an object that refers to the application model. It is an execution context for expressions. Scopes are arranged in hierarchical structure which mimic the DOM structure of the application. Scopes can watch expressions and propagate events. The characteristics of Scope are:

  • Scopes provide APIs ($watch) to observe model mutations.
  • Scopes provide APIs ($apply) to propagate any model changes through the system into the view from outside of the “Angular realm” (controllers, services, Angular event handlers).
  • Scopes can be nested to limit access to the properties of application components while providing access to shared model properties. Nested scopes are either “child scopes” or “isolate scopes”. A “child scope” (prototypically) inherits properties from its parent scope. An “isolate scope” does not. See isolated scopes for more information.
  • Scopes provide context against which expressions are evaluated. For example {{username}} expression is meaningless, unless it is evaluated against a specific scope which defines the username property.

9. What are the advantages of using Angular.js framework?

Angular.js framework has the following advantages:

  • Supports two way data-binding
  • Supports MVC pattern
  • Support static template and angular template
  • Can add custom directive
  • Supports REST full services
  • Supports form validations
  • Support both client and server communication
  • Support dependency injection
  • Applying Animations
  • Event Handlers

10. What is the difference between AngularJS and backbone.js?

AngularJS combines the functionalities of most third party libraries and supports individual functionalities required to develop HTML5 Apps.  While Backbone.js does these jobs individually.

11. Explain what is injector in AngularJS?

An injector is a service locator, used to retrieve object instance as defined by provider, instantiate types, invoke methods, and load modules.

12. What is factory method in AngularJS?

Factory method is used for creating a directive.  It is invoked when the compiler matches the directive for the first time. We can invoke the factory method using $injector.invoke.

Syntax: module.factory( 'factoryName', function );
Result: When declaring factoryName as an injectable argument you will be provided with the value that is returned by invoking the function reference passed to module.factory.

13. What is ng-app, ng-init and ng-model?

  • ng-app : Initializes application.
  • ng-model : Binds HTML controls to application data.
  • ng-Controller : Attaches a controller class to view.
  • ng-repeat : Bind repeated data HTML elements. Its like a for loop.
  • ng-if : Bind HTML elements with condition.
  • ng-show : Used to show the HTML elements.
  • ng-hide : Used to hide the HTML elements.
  • ng-class : Used to assign CSS class.
  • ng-src : Used to pass the URL image etc.

14. Does Angular use the jQuery library?

Yes, Angular can use jQuery if it’s present in the app when the application is being bootstrapped. If jQuery is not present in the script path, Angular falls back to its own implementation of the subset of jQuery that we call jQLite.

15. Can AngularJS have multiple ng-app directives in a single page?

No. Only one AngularJS application can be auto-bootstrapped per HTML document. The first ngApp found in the document will be used to define the root element to auto-bootstrap as an application. If another ng-app directive has been placed then it will not be processed by AngularJS and we will need to manually bootstrap the second app, instead of using second ng-app directive.

16. Can angular applications (ng-app) be nested within each other?

No. AngularJS applications cannot be nested within each other.

17. What is internationalization and how to implement it in AngularJS?

Internationalization is a way in which you can show locale specific information on a website. AngularJS supports inbuilt internationalization for three types of filters: currency, date and numbers. To implement internalization, we only need to incorporate corresponding js according to locale of the country. By default it handles the locale of the browser.

18. On which types of component can we create a custom directive?

AngularJS provides support to create custom directives for the following:

  • Element directives − Directive activates when a matching element is encountered.
  • Attribute − Directive activates when a matching attribute is encountered.
  • CSS − Directive activates when a matching css style is encountered.
  • Comment − Directive activates when a matching comment is encountered.

19. What is $rootscope in AngularJS?

Every application has a single root scope. All other scopes are descendant scopes of the root scope. Scopes provide separation between the model and the view, via a mechanism for watching the model for changes. They also provide event emission/broadcast and subscription facility.

Read More:   A COMPLETE GUIDE TO BENEFIT FROM MVP DEVELOPMENT

20. Can we have nested controllers in AngularJS?

Yes, we can create nested controllers in AngularJS. Nested controllers are defined in hierarchical manner while using in View.

21. What is bootstrapping in AngularJS?

Bootstrapping in AngularJS is nothing but initializing, or starting the Angular app. AngularJS supports automatic and manual bootstrapping.

  • Automatic Bootstrapping: this is done by adding ng-app directive to the root of the application, typically on the tag or tag if you want angular to bootstrap your application automatically. When angularJS finds ng-app directive, it loads the module associated with it and then compiles the DOM.
  • Manual Bootstrapping:Manual bootstrapping provides you more control on how and when to initialize your angular App. It is useful where you want to perform any other operation before Angular wakes up and compile the page.

22. What does SPA (Single Page Application) mean? How can we implement SPA with Angular?

Single Page Applications (SPAs) are web apps that load a single HTML page and dynamically update that page as the user interacts with the app. Since SPA the page never reloads, though parts of the page may refresh. This reduces the round trips to the server to a minimum.

It’s a concept where we create a single shell page or master page and load the webpages inside that master page instead of loading pages from the server by doing post backs. We can implement SPA with Angular using Angular routes. You can read up about SPAs here.

23. Why AngularJS?

AngularJS lets us extend HTML vocabulary for our application resulting in an expressive, readable, and quick to develop environment . Some of the advantages are:

  •     MVC implementation is done right.
  •     It extends HTML using directives, expression and data binding techniques to define a powerful HTML template.
  •     Two way data-binding, form validations, routing supports, inbuilt services.
  •     REST friendly.
  •     Dependency injection support.
  •     It helps you to structure and test your JavaScript code.

24. Is AngularJS compatible with all browsers?

Yes AngularJS is compatible with the following browsers: Safari, Chrome, Firefox, Opera 15, IE9 and mobile browsers (Android, Chrome Mobile, iOS Safari).

25. How to implement routing in AngularJS?

It is a five-step process:

  • Step 1: – Add the “Angular-route.js” file to your view.
  • Step 2: – Inject “ngroute” functionality while creating Angular app object.
  • Step 3: – Configure the route provider.
  • Step 4: – Define hyperlinks.
  • Step 5: – Define sections where to load the view.

26. Explain $q service, deferred and promises.

  • ‘Promises’ are post processing logics which are executed after some operation/action is completed whereas ‘deferred’ is used to control how and when those promise logics will execute.
  • We can think about promises as “WHAT” we want to fire after an operation is completed while deferred controls “WHEN” and “HOW” those promises will execute.
  • “$q” is the angular service which provides promises and deferred functionality.

Feeling overwhelmed with all the questions the interviewer might ask in your AngularJS interview? It’s never too late to strengthen your basics. Learn from industry experts on how to use AngularJS in real life use cases via a structured course.

Source: InApps.net

List of Keywords users find our article on Google:

deferred deep linking
angularjs inbuilt services
angular js jobs
angular developer jobs
angularjs component
ngmodel
angularjs directive
angularjs controller
ng bootstrap
ng-bootstrap
routing in angularjs
ngmodel angular
deferred deep linking android
ngclass
referenceerror: document is not defined
ng repeat
what is angularjs used for
angular ripple
controller interview questions
document controller interview questions
angular comment
react native realm
ng angular
angular ecommerce template
angular jobs
angular directive
android deferred deep link
angular scope
angular if
ats controller
custom application development
angularjs developer jobs
angular website templates
interview questions controller
get angularjs
interview questions for controller
inject/eject mechanisms
expo deep linking example
angular list group
interview questions for document controller
realm react native
backbone js interview questions
angular bootstrap icon
angularjs model
jquery-ripples
angular router animation example
angular refresh component
ng on view init
how to implement deferred deep linking
angular ecommerce
deferred deep link facebook
angularjs $q
ng-bootstrap/ng-bootstrap
outside sales representative interview questions
angular center component
angular and mvc net
angularjs admin templates
jobs for angular developer
deferred deep links ios
ng class
deferred deeplinking
angular directive style
knife templates
angular v13
ngclass angular
react hooks dependency injection
angular js
master spa filters
pass data between view controllers
front end app development
components and directives in angular
angularjs news
angular ng repeat
can we have nested controllers in angularjs?
angularjs ng-repeat
hrm fire news twitter
ace-master template bootstrap
angularjs ng repeat
angular refresh page
ngrepeat
saas worthy
features of angularjs
angular directive not working
business controller interview questions
cannot read property of undefined angular
ng for angular
angular 12 news
mission angular
for loop in angular
angular ng for
angular 8 developer jobs
website templates angular
angularjs bootstrap
angularjs ng-model on change
business controller job interview questions
data-ng-controller
jquery ajax success
angularjs get element by id
firefox angular
jquery ajax success data undefined
ng-controller
angularjs input date format
angularjs ui
angular ui bootstrap
for loop angular
ho chi minh city spa
jobs in angular
jquery bind
24 7 ai interview questions
angular call function from html
angular ng
angular while
angular select directive
binding watch app
car bootstrap
knife design template
angular bootstrap ui
angular ngrepeat
angular select ngmodel
angularjs conditional attribute
interview questions about change agility
ng bind html
angular promise
angularjs ng-app
encompass elements
validation in angular 13
bootstrap angular 12
free template angular
@ng-bootstrap/ng-bootstrap
angular 2 website templates
angular nested form validation
angular ngmodel
bootstrap for angular 12
bootstrap icon angular
angular bootstrap list
angularjs ng class
animation interview questions
best spa ho chi minh city district 1
angular 14
angular loop
angular ng input
angularjs directive watch
website templates angular 6
angular three
angular 7 interview questions
angular html
bootstrap ng
controller angularjs
ng-deep css
spa ho chi minh district 1
12 function swiss army knife
angular 8 class binding
angular binding
deep linking react native ios
ecommerce angular template free
eve-ng multiple users
how long does it take to learn angular js
jquery mobile refresh page
ng-select loading
angular admin template
angular condition in html
angularjs date
master spas parts
what is the difference between ng-if and ng-show+ng-hide?
@ng-bootstrap
angular 13 rest api example
angular focus event
animate angularjs
databinding
faq bootstrap 4
knife bootstrap
ng change angular
ng in angular
ngclass if
auto touch no root
html to angular
javascript is undefined
select bootstrap angular
twitter bootstrap interview questions
angular 7 ngclass
angular case
angular ng-deep
custom swiss army knife
global logic interview questions
inject jquery chrome
menu angular bootstrap
ng-show
the expression is undefined when x =
android deferred deep linking
angular bootstrap select
angular definition
angular function
angularjs service scope
bootstrap angular select
bootstrap ecommerce auto parts template
bootstrap vs angular
deferred deep linking android example
mvc net angularjs
referenceerror window is not defined
angular 2 ngshow
angular 5 directive example
angular bootstrap
angular country list
angular in action
angular interview questions for experienced professionals
angularjs on
attr angular
bootstrap for angular 11
branch deferred deep linking
deep linking in react native
eve directive
if condition in angularjs
ng form angularjs
referenceerror document is not defined
angular directive list
angular shell
angular-touch
referenceerror: window is not defined
search function angular
select angular bootstrap
angular 12 bootstrap
angular 2 admin
angular 5 deep linking
angular 7 ngmodel
angular 7 website templates free
angular file upload directive
angular ngclass
angular routing children
angular ui
angularjs bind class
angularjs post method
cannot find module angular/core
how much does angular developer make
ng show in angular
ngbootstrap
ngroute
property binding in angular 8
sharing data between angular components
angular 12 template
angular 6 class if
angular 6 interview questions
angular change locale dynamically
angular select bootstrap
angularjs links
ho chi min spa packages
interview questions for inside sales representative
ng hide angular
angular admin templates
angular and bootstrap 5
angular locale date format
angular ng init
angular routes
angular search function
angularjs number
deferred deep link
jquery if null
loop in angularjs
miner interview questions
ngshow angular
tag manager angular
typeerror undefined is not an object
angular this
angularjs input ng-change
ios deferred deep linking
bootstrap 5 e-commerce
angular templates
ng-app
most asked angular interview questions
automatic fire sprinkler design software
application delivery controller as a service market
hire dedicated html5 developer
dependency injection
react native development services
Rate this post
Content writer

Let’s create the next big thing together!

Coming together is a beginning. Keeping together is progress. Working together is success.

Let’s talk

Get a custom Proposal

Please fill in your information and your need to get a suitable solution.

    You need to enter your email to download

      Success. Downloading...