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Angularjs Interview Questions

An Overview of AngularJS

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.

It is a structural framework which is used to develop dynamic web app. We have an impressive collection of Angularjs Interview Questions and Answers that is a must read for all developers and designers!

Development History of Angular JS

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

Latest Version: Its latest version is ^7.0.0 active which was released in Oct 18.

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 well-defined structure.

Advantages of AngularJS

  • 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)

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 browser.

Here are the lists of all Angular Interview Questions list that are given below:-

Read more about this if you are preparing for Interview Questions on Angularjs.

Angularjs Interview Questions and answers

Looking for a new job? Do not miss to read our Angularjs Interview Questions and answers. Whether you are a fresher or an experienced, these questions and answers that can help you to crack your interview.

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.

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

  • 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

Data binding is an automatic synchronization of the data between the view and model components. Data binding lets you treat the model components as the 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

A module is a container for the different parts of 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', []);
                                            

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.

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.

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>   

  • 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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