AngularJS is an open-source JavaScript framework which builds high scale and extensible web applications. AngularJS works with HTML as well as with JavaScript. With the use of HTML, all the components will be clearly mentioned. It is best for single web page applications and used in the combination of HTML UI elements with JavaScript objects.
In this article, you can go through the set of AngularJs interview questions most frequently asked in the interview panel. This will help you crack the interview as the topmost industry experts curate these at HKR trainings.
Let us have a quick review of the AngularJs interview questions.
Ans:
AngularJS:
Angular:
Ans: It is a typescript and an open-source web application maintained by Google and a community of individuals. Angular provides a platform to develop web-based applications. It integrates a range of featuress such as dependency injection, end to end tooling, declarative templates and various other features that helps to smoothen the development path.
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Ans: The following things should be implemented for caching in observables.
Ans: The following methods implement multiple API calls for using rxjs.
Method 1:
this.http.get('/api/url').subscribe(data => {
this.http.get(/api/url/data).subscribe(data1 => {
// code goes here
});
});
Method 2:
Using "MergeMap"
this.http.get('/api/url').pipe(
mergeMap(character => this.http.get(character.homeworld))
);
Ans: Typescript is an open-source programming language led by Microsoft, and it is a structural superset that adds optional classes, types, and many other features. The typescript compiler is itself written the code in the typescript and compiled in the Javascript. It is used to develop Javascript applications for both client-side and server-side execution. Typescript is a primary language for angular apps development, and you can install it as globally by using the following syntax:
npm install -g typescript
Let’s look at an example.
function greeter(Name: string)
{
return "Hai, " + Name;
}
let user = "Surya";
document.body.innerHTML = greeter(user);
Ans: The various hooks available in AngularJS are.
1) ngOnInit()
2) ngOnChanges(),
3) ngDoCheck(),
4) ngAfterContentInit(),
5) ngAfterContentChecked(),
6) ngOnDestroy(),
7) ngAfterViewChecked(), and
8) ngAfterViewInit().
Ans:
Authentication: Authenticate API is used for verifying the user login credentials which are present in the server. After validation is completed, it returns JWT (JSON Web Token) to the users. The JWT token contains the information of the current user and it identifies the users. This is called authentication.
Authorization: Every user has a different level of accessing resources. While some users have access to all the resources, others may have access for only a few files or resources. This is called authorization.
In order to build authentication, on the client we need to build the login page and on the server, we should build an API endpoint to validate the user. When the user clicks on the login button.
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Ans:
Angular:
JQuery:
Ans: Data binding is a powerful and essential feature in any software development process. It allows communication between view and component. The following are the different types of data binding:
Ans: Animations are implemented using the angular library known as Animate Library. The user must include this library for applying animations effects in an angular application. The users should refer to the “ngAnimate” module in the application or add if the application has a name, add “ngAnimate” as a dependency inside the application module.
Angular Library:
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