10 Effective and Essential Angular Javascript Interview Questions

10 Effective and Essential Angular Javascript Interview Questions

Looking for Effective and Essential Angular Javascript Interview Questions ? AngularJS is a JavaScript-based open-source front-end web framework mainly maintained by Google and by a community of individuals and corporations to address many of the challenges encountered in developing single-page applications. It aims to simplify both the development and the testing of such applications by providing a framework for client-side model–view–controller (MVC) and model–view–viewmodel (MVVM) architectures, along with components commonly used in rich Internet applications. Source: Wikipedia.

10 Effective and Essential Angular Javascript Interview Questions

Q1. Explain Angular JS in brief ?

A Structural framework that lets you use HTML as your language for templates. Also, it allows you to extend the syntax of HTML. It provides flexibility to avoid writing hundreds of initialization codes just to get started.
Google started to work with Angular JS in 2009.
It is data binding and it performs or showcases all the output within the Browser. We can also call it a JavaScript framework, and can be added with the <Script> tag in the HTML pages. It provides options to the developers to write an application for the client side using JavaScript.

Q2. Name directives in AngularJS which will define what variable value to be used?

Using Directive, we can define the input time as Text, the entered text could be Email, Name, etc. are Angular JS uses ng-model.
Use ng-model in Angular JS Code:
Input Code:

[wpsm_codebox style=”2″]

<!DOCTYPE html>
<html>
<script src=”https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js”></script>
<body>
<div ng-app=”myApp” ng-controller=”myCtrl”>
Institute Name: <input ng-model=”name”>
</div>
<script>
var app = angular.module(‘myApp’, []);
app.controller(‘myCtrl’, function($scope) {
$scope.name = “GoApti”;
});
</script>
<p>That’s how we can use this input directive as Text input.</p>
</body>
</html>

[/wpsm_codebox]

Q3. Explain the code to enable the double click button in Angular JS?

ng-dblclick allows to specifying custom behavior on a double-click event on the web pages. It can be used as an attribute of the HTML element.
By using the following procedure, we can create a sample code of a double-click event using AngularJS.
ng-model has bound as a Textbox and the double click button is bound with ng-dblclick & we have written ‘Hello ‘+name.
Here Hello is a string and name defined as the variable that will contain input value as TextBox.
This button – “Double Click for EduCBA” will work when you double-click on it.
Input Code:

[wpsm_codebox style=”2″]

<!doctype html>
<html ng-app>
<head>
<script src=”angular.min.js”></script>
</head>
<body>
Name:
<input ng-model=”name” type=”text” />
<button ng-dblclick=”Msg=’Hello ‘+name”>
Double Click for GoApti
</button>
</br>
<h3>
Please double click – GoApti
</h3>
</body>
</html>

[/wpsm_codebox]

Q4. what “routes” does in Angular JS?

It enables to create of different-different URLs for the different content in the application. Angular js route enables users to bookmark content of different URLs for the different content. These such bookmark URLs are the route in AngularJS.
Value of a Number, JavaScript or String in Angular JS is a simple object & this should belong to Angular JS.
The values are used as configuration injected into controllers, services or factories. By adding a parameter, values can be injected into the Angular JS controller function having named the same as value.

Let us move to some other Angular Javascript Interview Questions

Q5. Explain some Unique feature of AngularJS?

Registering Callbacks are not required in Angular JS. This feature makes Angular JS code much simple and very easy to debug.
The applications which have been created using Angular JS never influence the DOM (Document Object Model).
Angular JS helps to transfer the data to and from the UI, it also helps to eliminate issues like validating a form, validation error display, etc.

Must Read: 25 Effective Software Engineering Interview Questions

Q6. List all types of Custom directive in Angular JS?

Following are the Custom directives in Angular JS:

  1. Element directives: This Directive works when the matching element is confronted.
  2. CSS class directives: It starts works when the same CSS style matches.
  3. Comment directives: When matching comment found it gets activated.
  4. Attribute directives: Attribute directives come into picture when matching/same directive is confronted.

Official website of Angular JavaScript

Q7. Explain different types of bootstrapping in AngularJS?

Starting or initializing the application called Bootstrapping. Angular JS having two types of bootstrapping:

  1. Automatic Bootstrapping: Adding the ng-app at the root of an application. After finding the ng-app angular js loads the associated module with it and then the compilation of DMO happens.
  2. Manual Bootstrapping: To get more control over the initialization of your angular app we use manual bootstrapping. It provides control over how and when to start the app. It is much useful when another operation will get performed before waking up the Angular JS and compilation of the page.

Let us move to some other Angular Javascript Interview Questions

Q8. Explain any Angular JS service using the code?

Services are the objects or functions used to carry out specific tasks.
It can be built by a developer in Angular JS. Angular JS developers can define their own services. By registering the service’s name and service factory function they can define it. also, there are almost 30 to 35 inbuilt services are available for instant use. $timeout is one of the Angular JS services.
$timeout service is being used to change the value in a specified number of milliseconds. This service is useful for changing the value after the predefined time limit.
Input Code:

[wpsm_codebox style=”2″]

<!DOCTYPE html>
<html>
<script src=”https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js”></script>
<body>
<div ng-app=”myApp” ng-controller=”myCtrl”>
<p>GoApti code will change this header will change after 3 seconds:</p>
<h1>{{myHeader}}</h1>
</div>
<p>The $timeout service works after a specified number of milliseconds.</p>
<script>
var app = angular.module(‘myApp’, []);
app.controller(‘myCtrl’, function($scope, $timeout) {
$scope.myHeader = “Hello GoApti!”;
$timeout(function () {
$scope.myHeader = “How are you today?”;
}, 3000);
});
</script>
</body>
</html>

Output:

“This code will change the value to default after 3 seconds”[/wpsm_codebox]

Let us move to some other Angular Javascript Interview Questions

Q9. Explain all the Security features in AngularJS?

There are built-in protections, provided by Angular JS. Refer to the following security features.
It prevents Cross-site scripting. It is a hacking technique where a hacker can send a request form and can get confidential or private information easily.
It also prevents injection attacks HTML.
It prevents XSRF (Cross-site request forgery) protection for server-side communication. Angular JS handled it by the “Auth token” mechanism. Whenever users’ logins for the very first time it sends a user id and password to the server and in turn, it will return an Auth token. this authorized token does the authentication in all future transactions.

Q10. Explain the Syntax to show the entered password using Angular JS?

Using the below code, the Developer can switch the visibility of the password to the user.
Input Code:

[wpsm_codebox style=”2″]

<!– Password field –>
Password: <input type=”password” value=”GoApti” id=”myInput”>
<!– An element to switch between password visibility –>
<input type=”checkbox” onclick=”myFunction()”>Show Password

[/wpsm_codebox]

Leave a Comment

Leave the field below empty!

Join our list

Subscribe to our mailing list and get interesting stuff and updates to your email inbox.

Thank you for subscribing.

Something went wrong.

Join our list

Subscribe to our mailing list and get interesting stuff and updates to your email inbox.

Thank you for subscribing.

Something went wrong.