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For dynamic web apps, AngularJS is a structural framework. HTML is allowed to be used as the template language and it allows extending HTML's syntax to express the application's components clearly. The data binding and dependency in AngularJS remove the code without having to write the code. All these happen within the browser, making Angular JS an ideal partner with any server technology. The impedance mismatch between dynamic applications and static documents is often solved with:
Due to the multifaceted features of AngularJS, many companies are using it to sin apps for their systems or to deliver worthy software to their clients. In any case, they need a very skilled person who knows the complete AngularJS framework to fill these job roles. If you are likely to attend or conduct an interview based on AngularJS, then please go through a list of questions that have been dealt with in this blog.
AngularJS Interview Questions and Answers are Classified into Four Parts:
These are the most popular Angularjs interview questions that have been doing the rounds in many AngularJS interview sessions.
For anyone who is looking forward to attending an interview based on AngularJS recently, here are the most popular interview questions and answers to help you in the right way for your job interview. After taking inputs from various students who have appeared in AngularJS interviews lately we have compiled a list of the most frequently asked questions along with their appropriate answers to help the fresher and the experienced individuals.
Jquery is a library utilized for DOM control whereas Angular is a structure. ... Jquery does not have two-way restricting highlights while Angular has key highlights like routing, orders, two-way information authoritative, models, reliance infusion, unit tests, and so on.
AngularJS is a framework used for creating single web page applications in JavaScript. It allows using HTML as the template language that enables to extend HTML’s syntax to express the components of the application clearly.
Angular.js framework comes with the following advantages:
Initially, Angular JS was developed by Misko Hevery and Adam Abrons, and later on, it was further developed by Google.
The key features of AngularJS are-
The architecture of AngularJS is based on 3 components. They are
The application model is referred to as scope, which acts between the application controller and the view, to connect them. Scopes can watch expressions and propagate events and are arranged in the hierarchical structure which can also impersonate the Document Object Model(DOM) structure of the application.
Read: Difference Between AngularJs vs. Angular 2 vs. Angular 4 vs. Angular 5 vs. Angular 6
The scope is an AngularJS object that refers to the model of the application. It is an execution setting for articulations. Scopes are usually arranged in progressive structures which emulate the DOM structure of the application. Scopes can watch articulations and proliferate events. The attributes of Scope are:
The template in AngularJS is the HTML part of the angular app. It is similar to a static HTML page, apart from the fact that templates do contain additional syntaxes which then allow the data to be inserted in it in a directive to provide a tailored user experience.
As indicated by 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 different ways of data binding they are-
Anything that introduces new syntax, is called directives. They are like markers on the Document Object Model(DOM) element that incorporates a special behavior to it. Directives are the most important components in the AngularJS application. Some of the commonly used directives are ng-model, ng-bind, ng-repeat ng-App, ng-show, etc.
The controller is a function in AngularJS that usually tries to take an empty scope object as its parameter and then adds the fields to it. This enables the functions to be later exposed to the user via the view component.
The services in AngularJS are the singleton objects or functions, used for carrying out specific tasks. Angular JS holds business logic and these functions are known as controllers, directives, and filters, and so on.
The link function is the feature that combines the directives with a scope in an AngularJS environment to produce a live view. It is different from a compile because the function of a compile is template DOM manipulation along with the collection of all the directives present.
AngularJS is an open-source client-side MVC framework for creating dynamic web applications.
Using interpolate service, the compiler matches the text and attributes in the compilation process to check the embedded expressions. These expressions are updated and registered as watches, as a part of the normal digest cycle.
An injector is a service locator as defined by a provider, instantiate types, invoke methods, and load modules. The injector is used to retrieve object instances. The single injector present per Angular application helps to look up an object instance by its name.
The factory method is used for creating the directive. When the compiler matches the directive for the first time, the factory method is invoked once. The factory method is invoked using $injector. invoke.
Controllers are JavaScript capacities that give information and rationale to HTML UI. As the name recommends, they control how information streams from the server to HTML UI.
In an AngularJS environment, an Expression is a typical JavaScript that resembles the code snippets which are used to bind the expression data in the view or the HTML. Every Angular expression needs to be written the two curly braces as given below- {{a+b}}
A digest cycle in AngularJS is the process behind data binding in the AngularJS environment. The digest cycle is generally triggered automatically but if you want to trigger it manually then you can use $apply() command.
Whenever a digest cycle is going on, all the new scope model values are matched against the previous scope values. This is called dirty checking.
There is a very minor change that you would have to do and that is you would need to change the .directive command to .component command
Setting up an Angular app is not difficult at all. You just have to follow the steps given here-
Each angular application consists of a root scope but can have several child scopes. The application can have multiple scopes as child controllers and directives create new child scopes. When new scopes are created they are added as children of their parent scope, they also create a hierarchical structure similar to DOM.
AngularJS combines the functionalities of most of the third-party libraries and supports individual functionalities that are required to develop HTML5 Apps.
To make an ajax call, AngularJS provides ‘$http’ control which provides the service to read data from the server. A database call initiates the server to fetch the desired records. Once the data is ready, $http can be used to get the data from the server in the following manner:
functionstudentController($scope,$http){ varurl="data.txt"; $http.get(URL).success(function(response){ $scope.students= response; }); }
$routeProvider is the key service that sets the configuration of URLs, attaches a controller with the same, and maps them to the corresponding HTML page or ng-template,
The scope is a special JavaScript object, that contains the model data. The role of joining the controller with the views is done by scope. Model data is accessed via $scope object In controllers. $rootScope is the parent of all of the scope variables.
var app = angular.module("AngularApp", ['ngRoute']); app.config(['$routeProvider', function($routeProvider) { $routeProvider. when('/page1', { templateUrl: 'Modules/Page1/page1.html', controller: 'Page1Controller' }) . when('/page2', { templateUrl: 'Modules/Page2/page2.html', controller: 'Page2Controller' }) . otherwise ({ redirectTo: '/page1' }); } ]);Link combines the directives with a scope and produces a live view. The link function is responsible for registering DOM listeners as well as updating the DOM. It is executed after the template is cloned.
DI or Dependency Injection is a software design pattern that deals with how code gets hold of its dependencies. To retrieve elements of the application, the operation “config” uses dependency injection which is required to be configured when the module gets loaded.
The ways that an object used to hold of its dependencies are:
Angular expressions are code snippets that are usually placed in the binding as in Javascript. {{expression}} The key difference between the JavaScript expressions and Angular expressions
Yes. We can create nested controllers in AngularJS. The nested controller is defined hierarchically while using in View. Take a look at the below code. hierarchy is "MainCtrl -
Q34). Do you think AngularJS is compatible with all the browsers?
Yes, AngularJS is pretty much compatible with most browsers. To name a few compatible browsers Safari, Chrome, Firefox, Opera 15, IE9.
Q35). How will you execute a routing in the AngularJS framework?
It is a very easy five-step process as follows:
- The first step would be to add the “Angular-route.js” file to your view.
- The second step would be to inject “ngroute” functionality when you are creating an Angular app object.
- In the next step, you are required to configure your route provider.
- Thereafter comes the step where you need to define the hyperlinks.
- Lastly, define the sections where you have to load the view.
Q36). Is it true that Angular utilizes the jQuery library?
Truly, Angular can utilize jQuery if it's present in the application when the application is being bootstrapped. If jQuery is absent in the script path, Angular falls back to its very own usage of the subset of jQuery that we call jQLite.
Q37). List down the types of the component on which we can create custom directives.
AngularJS offers help to make custom directives for the accompanying:
- Element directives − Directive enacts when a coordinating component is experienced.
- Attribute − Directive initiates when a coordinating characteristic is experienced.
- CSS − Directive enacts when a coordinating CSS style is experienced.
- Comment − Directive enacts when a coordinating comment is experienced.
Q38). Explain bootstrapping in AngularJS?
Bootstrapping in AngularJS refers to the process of instating, or beginning the Angular application. AngularJS bolsters programmed and manual bootstrapping.
- Automatic Bootstrapping: this is finished by adding an ng-application directive to the base of the application, regularly on the tag or the tag on the off chance that you need angular to bootstrap your application consequently. At the point when angularJS discovers the ng-application mandate, it stacks the module related to it and after that assembles the DOM.
- Manual Bootstrapping: Manual bootstrapping gives you more control over how and when to introduce your angular App. It is valuable where you need to play out some other activity before Angular kicks in and arrange the page.
Q39). How will you explain the SPA (Single Page Application)? How can you execute a SPA with Angular?
Single Page Applications (SPAs) are web applications that heap a solitary HTML page and progressively refresh that page as the client collaborates with the application. In a SPA the page never reloads, however parts of the page may invigorate. It's where we make a solitary shell page or ace page and load the website pages inside that ace page as opposed to stacking pages from the server by doing postbacks. We can actualize SPA with Angular utilizing Angular routes.
Q40). What is the Jasmine tool?
Jasmine is a conduct-driven improvement tool for JavaScript that has turned into the most mainstream decision for testing AngularJS applications. Jasmine gives capacities to help to organize your tests and making statements. As your tests develop, keeping them very much organized and recorded is fundamental, and Jasmine accomplishes this.
Q41). What is the purpose of the track by in ng-repeat?
In Angular JS, directives like ng-repeat track each element for minimizing the DOM creation. It stores the object instance when a new element is added to the collection. When ng-repeat is used with an object having a unique id, the identifier should do the tracking. Code is like this:
item in items tracks by item. id
42) How logs are maintained in Angular JS?
Logs are maintained with the help of the $log service, which helps in debugging and troubleshooting. The methods used are as follows:
log()-writes a log message in the console
info()-writes an information message
warn()-write a warning message
error()-writes an error message
debug()-writes a debug message
Practice Angular, and Go For It!!
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