Introduction to Angular JS Interview Questions and Answers
If you are looking for a job that is related to Angular JS, you need to prepare for the 2020 Angular JS Interview Questions. Though every Angular JS Interview is different and the scope of a job is also different, we can help you out with the top Angular JS Interview Questions and Answers, which will help you take the leap and get your success Angular JS. So we have designed the most common Angular JS Interview Questions and Answers to help you get success in your interview.
Below is the list of 2020 Angular JS Interview Questions updated for 2020. These questions are divided into two parts.
Part 1 – Angular JS Interview Questions (Basic)
This first part covers basic Angular JS Interview Questions and Answers
Q1. Explain Angular JS in brief?
Answer:
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 that will define what variable value to be used?
Answer:
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:
<!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 = "EduCBA";
});
</script>
<p>That's how we can use this input directive as Text input.</p>
</body>
</html>
Let us move to the next Angular JS Interview Questions.
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Q3. Explain the code to enable the double click button in Angular JS?
Answer:
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 then 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:
<!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 EduCBA
</button>
</br>
<h3>
Please double click - EduCBA
</h3>
</body>
</html>
Q4. What “routes” does in Angular JS?
Answer:
It enables to the creation 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.
Q5. Explain some Unique features of AngularJS?
Answer:
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.
Part 2 – Angular JS Interview Questions (Advanced)
Let us now have a look at the advanced Angular JS Interview Questions.
Q6. List all types of Custom directives in Angular JS?
Answer:
Following are the Custom directives in Angular JS
Element directives: This Directive works when the matching element is confronted.
CSS class directives: It starts works when the same CSS style matches.
Comment directives: When a matching comment is found, it gets activated.
Attribute directives: Attribute directives come into the picture when matching/same directive is confronted.
Q7. Explain different types of bootstrapping in AngularJS?
Answer:
Starting or initializing the application is called Bootstrapping. Angular JS having two types of bootstrapping.
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.
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 the next Angular JS Interview Questions.
Q8. Explain any Angular JS service using the code?
Answer:
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:
<!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>EduCBA 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 EduCBA!";
$timeout(function () {
$scope.myHeader = "How are you today?";
}, 3000);
});
</script>
</body>
</html>
“This code will change the value to default after 3 seconds.”
Q9. Explain all the Security features in AngularJS?
Answer:
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?
Answer:
Using the below code, the Developer can switch the visibility of the password to the user.
Input Code:
<!-- Password field -->
Password: <input type="password" value="EduCBA" id="myInput">
<!-- An element to switch between password visibility -->
<input type="checkbox" onclick="myFunction()">Show Password
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