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Angularjs Interview Questions

Angularjs Interview Questions

A JavaScript client-side framework, AngularJS offers a structured method of building websites and applications. It is a structural framework which is used to develop the dynamic web app. We have an impressive collection of AngularJS Interview Questions that is a must-read for all developers and designers!. Its JavaScript library enforces the Model View Controller (MVC) framework. AngularJS I said to be one of the most widely used JavaScript client-side frameworks in the world.

Quick Overview of AngularJS

AngularJS
What is AngularJS? It is a structural framework which is used to develop the dynamic web app.
Latest Version Angular 8.0. released on 28 May 2019
Created By Google
Written in TypeScript
Official Website https://angular.io/

Development History of Angular JS

AngularJS was developed by Misko Hevery and Adam Abrons in 2009. The framework is maintained by Google now.

It is not a single piece in the overall puzzle of building the client-side of a web application. It also handles all of the AJAX and DOM code you once wrote by hand and puts it in a clear structure.

Advantages of AngularJS

  • Easy to implement MVC.
  • Makes HTML more intuitive and easier to maintain.
  • More comfortable to access, manipulate, and implement.
  • Applications use very less code compared to other JavaScript applications.
  • Supports the test-driven development approach (TDD)

Though every interview is different, we can help you crack your next interview with the most commonly asked Angularjs Interview Questions, which will help you achieve success.

Installation Steps

  • Open the link https://angularjs.org/
  • You will see two options on this page - View on GitHub and Download.
  • Click the download button, and it will start downloading angular.min.js.
  • Create an HTML page and include the following AngularJS JavaScript file
    http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js with script tag
  • Run the HTML page in the browser.

 

We have a collection of various Interview Questions with Answers based on Angular JS list that is given below:-


Last update: 31 Aug 2019, 39 Questions and Answers

Most Frequently Asked Angularjs Interview Questions And Answers With Examples:

A JavaScript client-side framework, AngularJS offers a structured method of building websites and applications.Its JavaScript library enforces the Model View Controller (MVC) framework. AngularJS i said to be one of the most widely used JavaScript client-side frameworks in the world.

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  • Easy to implement MVC.
  • Makes HTML more intuitive and easier to maintain.
  • Easier to access, manipulate, and implement.
  • Applications use very less code compared to other JavaScript applications.
  • Supports test-driven development approach (TDD)
  • Unit Testing
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Data binding is automatic synchronization of the data between the view and model components. Data binding lets you treat the model components as a single source of truth in your applications. The view component is a projection of the model. When the model changes, the view will reflect the change, and vice versa.

NOTE: This information is likely to be asked in angularjs interview questions.

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Each application contains one root scope and several child scopes. And, when new scopes get created, they get added as children of the parent scope. Similar to DOM, they create a hierarchical structure.

You can easily get marks in this Angularjs Interview Question by just naming the types of fits in Angular Interviews.

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Single Page Applications are web apps that load an HTML page and dynamically update it as and when users interact with the app. However, please note that in an SPA, the page will never reload, though parts of that page may get refreshed. This functionality reduces the trips to the server. SPA can be implemented with Angular through Angular routes.

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It is used to format the value of the expression to display the output. AngularJS enables us to apply filter. It can be added to expressions by using the pipe character |, followed by a filter.

Example

                                                    

<div ng-app="myApp" ng-controller="personCtrl">    

<p>The name is {{ firstName | uppercase }}</p>    

</div>    

<script>    

angular.module('myApp', []).controller('personCtrl', function($scope) {    

    $scope.firstName = "Umesh",    

    $scope.lastName = "Singh"    

});    

</script>   

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The singleton pattern allows us to limit the instantiation of a class in order to have only one object. We can use the dependency injection and services for enabling the singleton pattern. Whenever the singleton pattern is enabled, the class will create the object and return a reference in the next call.

NOTE: Learn the basic concept of Singleton pattern and work to crack the Angularjs Interview Questions.

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  • Currency It formats a number to a currency format.
  • Date It formats a date to a specified format
  • Filter It selects a subset of items from an array.
  • JSON It formats an object to a Json string
  • Limit It is used to limit an array/string, into a specified number of elements/characters.
  • Lowercase It formats a string to lower case
  • Uppercase It formats a string to upper case.
  • Number It formats a number to a string.
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Most of the Javascript frameworks parse the HTML template as a stream and return the result as a string. The resulting string gets dumped into the DOM and can be retrieved using innerHTML(). AngularJS works directly on HTML DOM rather than strings. It uses two-way data binding to sync the data.

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Services are one of the ways to communicate with controllers, but it is possible to inject one service into another. Services can be used for doing other things like authentication and logging. It is one of the most common Angularjs Interview Questions.

Directives are for creating widgets or wrapping things like jquery plugins. However, if you do not need two-way data binding, then you do not need to wrap them.

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It is a mechanism that makes an application as a Single Page Application. It routes the application to different pages without reloading the whole application.

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AngularJS was developed by Misko Hevery and Adam Abrons. The framework is maintained by Google now.

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Directives are a core feature of AngularJS that allows you to discover new HTML syntax, which is specific to your particular application. Directives are functions that execute when the Angular compiler finds them in DOM. The different types of directives are an element, attribute, CSS class, and comment.

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Controllers are essentially Javascript functions that provide data and logic to the HTML user interface. As the name suggests, controllers are designed to control how data will flow from the server to the HTMLuser interface.

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

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The factory method, used for creating a directive, gets invoked when the compiler matches the directive for the first time. This function can be invoked by $injector.invoke.

Syntax: module.factory( 'factoryName', function );

When you declare factoryName as an injectable argument, you will get the value which will be returned by invoking the function reference passed to the module.factory.

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Yes, Angular uses jQuery if it is present in the app when your application is being bootstrapped. However, if jQuery is not present in the script path, Angular will fall back to its own implementation of the subset of jQuery. This is called jQLite.

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No. You can auto-bootstrapped only one AngularJS application per HTML document. However, the first ngApp found will be used by default to define the root element to auto-bootstrap. Yet, if another ng-app directive gets placed, then it will not be processed by AngularJS. In this case, you should manually bootstrap the second app instead of using the second ng-app directive.

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Internationalization allows you to show locale-specific information on a site. AngularJS is supporting inbuilt internationalization only for three types of filters: date, currency, and numbers. In order to implement internalization, you only need to incorporate the corresponding js as per the locale of the country. It will handle the locale of the browser by default.

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Every application contains a single root scope, and the rest of the scopes are descendant scopes of the root scope. The function of scopes is to provide separation between the view and the model, via a mechanism for observing the model for changes. Scopes also provide event emission, event broadcast, and subscription facilities.

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Bootstrapping is a term for initializing the Angular app. Both automatic and manual bootstrapping is supported in AngularJS. Automatic Bootstrapping is done by adding an ng-app directive to the root of the application. Manual Bootstrapping provides control on how and when to initialize the app. It is useful in performing any operation before Angular compiles the page.

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The compiler matches attributes and text using interpolate service to check if they contain any embedded expressions. As part of the normal cycle, these expressions will get updated and registered as watches.

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Links combine the directives with a scope and help in producing a view. The link function registerS DOM listeners and for updating the DOM. It gets executed once the template is cloned.

The pre-linking function gets executed before linking the child elements. Pre-linking is not safe for DOM transformation. Post linking is executed after linking the child elements. Post linking is safe for DOM transformation.

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The ng-template allows us to create an HTML page using the script tag. This template contains "id" attribute that can be used by the $routeProvider to map view model with a controller.

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This directive has unique variables that are useful for iterating the collection. Some of these variables include, $index, $first, $middle, and $last.

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A module is a container for the different parts of the application like services, controller, filters, directives, etc. Module treats as a main() function. It is created using an object's module() method.

Example

                                                    

var app = angular.module('MApp', []);

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It is the code snippets that resolves to a value. AngularJS expressions are placed inside {{expression}}.

For Example:{{1+1}}

It supports one-time binding expressions.

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getCheckDimenstions(ev: Event) {
   if (ev && ev.target && ev.target.files) {
     const file = ev.target.files[0];
     const img = new Image();
     img.onload = function() {
       alert('Width:' + this.width + ' Height: ' + this.height);
     };
     img.src = URL.createObjectURL(file);
  }
}

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