71+ AngularJS Interview Questions And Answers 2020

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AngularJS Interview Questions For Freshers & Experienced 2020

What is AngularJS?

AngularJS is developed by Google and it’s an open supply framework and it’s used to create one web page net apps or single web page utility utilizing JavaScript, HTML and CSS.

What are the makes use of of AngularJS?

Below are the makes use of of AngularJS:

  • It makes use of MVC sample.
  • Allows to create our personal directive for making parts reusable.
  • Used for 2 approach binding i.e, connecting mannequin and think about.
  • Supports Dependency Injection (DI).

Explain the options of AngularJS?

Below are the checklist of AngularJS options:

  • Model
  • View
  • Controller
  • Scope
  • Data Binding
  • Services
  • Filters
  • Directives
  • Testable

Explain scope in AngularJS?

Scope will act like a glue between view and controller and scopes are organized in hierarchical construction.

Why the AngularJS challenge known as “AngularJS”?

The cause is HTML can have angle bracket “<”, “>” and “ng” is sound like “Angular”. So it’s being known as as AngularJS.

List out the benefits of AngularJS?

Below are the checklist of benefits of AngularJS:

  • Code Reusability
  • Data Binding
  • Testing
  • Support
  • Customize and Extensible

What are AngularJS Expressions?

Angular Expressions are code snippets and this often be positioned in “{{ }}”. This will probably be like – {{ expression }}.

List out the variations between java Script and angular JS expressions?

Below are the checklist of variations between java script and angular JS

  • In Javascript expressions are being evaluated from the worldwide window whereas in angularJS it’s being evaluated from scope object.
  • Conditions, Loops and Exceptions will not be supported in AngularJS as in Javascript.

AngularJS Interview Questions

Explain controller in AngularJS?

Controller is constructor perform in AngularJS. Controller may be connected to DOM utilizing “ng-controller” attribute.

Which and all browsers help AngularJS?

All main browsers like: Chrome, Safari, Firefox, Opera 15+, IE 9+ will help AngularJS.

How AngularJS is used to deal with the safety hurdles?

Below are the checklist of safety hurdles dealt with by AngularJS:

  • Used for stopping CSS assaults
  • Used for stopping XSRF safety
  • Used for stopping HTML injection

Explain module in AngularJS?

Modules are like namespaces in C#. Modules are used for dividing single web page angular app to purposeful, reusable and small parts and may be built-in with one other angular app. Module may be assigned utilizing “ng-app” directive.

How we are able to use JQuery with AngularJS?

AngularJS makes use of JQLite, which is part or subset of JQuery library. If JQuery for use then load the JQuery library earlier than loading the AngularJS library.

Explain how we are able to create module and utilizing it in AngularJS?

Below is the code snippet for creating and utilizing module in AngularJS:

Creating a module:

<script kind=”text/javascript”>
angular.module(‘myFirstApp’, []);
angular.module(‘myFirstApp’, [‘MydependentModule1’, ‘MydependentModule2’]);
</script>
Using the Module:

<html ng-app=”‘myFirstApp'”>
<head> … </head>
<physique> … </physique>
</html>

AngularJS Interview Questions And Answers

Explain directive in AngularJS?

Directive are mixture of javascript code and AngularJS markup. Javascript directive code defines the behaviors and template knowledge of HTML parts. There are some inbuilt directives like – “ng-controller”,”ng-app”, “ng-repeat” and so forth.

Explain directives – “ng-init”, “ng-model” and “ng-app” in AngularJS?

“ng-init” – This directive is used for initializing the angular app knowledge.
“ng-model” – This directive is used to bind the html parts like – choose, enter, textual content space and so forth.
“ng-app” – This directive initializes the angular app.
17) Which is the core module of AngularJS?
“ng” is the core module of AngularJS and when angular app is began this module will probably be loaded by default.

How dependencies are loaded in AngularJS?

Dependencies are loaded utilizing blocks – configuration and run.

List out the variations between config and run strategies in AngularJS?

Config Block: Constants and suppliers may be injected into config blocks and this block may be created utilizing config technique.
Run Block: Run block will probably be executed after config block. Run block is used to inject constants and cases and this block may be created utilizing run technique.
Eg :

angular.module(‘myTestModule’, []).
config(perform (injectables) {
// config block
}).
run(perform (injectables) {
// run block
});

List out kinds of directives in AngularJS?

Below are the checklist of directives in AngularJS:

  • Attribute directives
  • Comment directives
  • Element directives
  • CSS class directives

Explain injector in AngularJS?

Injector is service locator and it’s used for retrieving object cases as outlined by instantiate varieties, supplier and cargo modules.

AngularJS Interview Questions And Answers For Experienced

List out styling types used with ngModel for css lessons?

Below are the checklist of styling types used for css lessons with ngModel

  • ng-dirty
  • ng- legitimate
  • ng-pristine
  • ng- invalid

Explain prefixes – “$” and “$$” in AngularJS?

Both prefixes are used to stop the collisions within the code.

“$” – Public objects makes use of this prefix.
“$$” – Private objects makes use of this prefix.

Explain filters in AngularJS?

Filters are primarily used to format the info earlier than displaying it within the display to the person. This can be utilized in providers, controllers, directives and templates.

Eg: Syntax of the filter

filter

<script kind=”text/javascript”>
{ } //returns $25.00
</script>

List out few filters supported by AngularJS?

Below are few filters offered by AngularJS –

  • Date
  • Currency
  • OrderBy
  • Lowercase
  • Uppercase
  • Number and so forth.

How to outline a number of prohibit choices on a directive in AngularJS?

We can specify a number of prohibit choices for supporting a couple of technique. All strategies ought to specify prohibit key phrase like under:

prohibit: ‘TA’

AngularJS Interview Questions For Experienced

Explain providers in AngularJS?

Services are singleton features or objects that are used to hold out particular duties. It will maintain the business logic, that are known as as controllers, filters, directives and so forth.

What are knowledge bindings in AngularJS?

Data binding is the method of synchronizing of knowledge between view and mannequin.

What are the kinds of knowledge binding in AngularJS?

Below are the checklist of kinds of knowledge bindings in Angular JS

  • Data binding in angular templates
  • Data mining in classical template techniques

Why to make use of “$http” in AngularJS?

“$http” is used as an AngularJS service to learn knowledge from distant server.
“$http.get(url)” technique is used for this objective by specifying the url as a parameter.

List out the parts which can be utilized in AngularJS modules?

Below are the checklist of parts:

  • Controller
  • Filter
  • Provider
  • Factory
  • Routes
  • Service
  • Directive

AngularJS 4 Interview Questions

Which is the core module in AngularJS?

“ng” is the core module in AngularJS and this module will probably be loaded by default when angular utility has began.

How looping has been accomplished in AngularJS?

Looping may be achieved like under in AngularJS:
<ul>
<li data-ng-repeat=”mytestname in names”>
{{ mytestname }}
</li>
</ul>

Explain manufacturing unit strategies in AngularJS?

Factory strategies are used for making a directive. It may be invoked solely as soon as that’s when compiler matches the directive.

Can we create a customized directive in AngularJS?

Yes we are able to create customized directive.

How to load choose field throughout web page initialization utilizing AngularJS?

Below is the pattern code to initialize the choose field utilizing AngularJS –

<div ng-controller = “mycontroller” ng-init = “loaddataforselectBox()”>
</div>

How AngularJS will mechanically be initialized?

AngularJS will probably be initialized throughout “DOMContentLoaded” occasion or throughout the angular.js file obtain to browser. Now AngularJS seems for directive – “ng-app”, which is a root compilation for AngularJS.

What is the distinction between Rootscope and Scope in AngularJS?

Rootscope: Rootscope is the highest most scope and one utility can have an just one rootscope and will probably be shared amongst all of the parts.
Scope: Scope will act like a glue between view and controller and scopes are organized in hierarchical construction.

AngularJS Tricky Interview Questions

Give an instance for Rootscope in AngularJS?

Rootscope acts like a worldwide variable and under is the pattern code for a similar:

<html>
<physique ng-app=”mytestApp”>
<div ng-controller=”MyFirstController” type=”border:2px solid blue; padding:5px”>
Hi {{mymsg}}!
<br />
Hi {{myname}}! (rootScope)
</div>
<br />
<div ng-controller=”MySecondController” type=”border:2px solid green; padding:5px”>
Hello {{mymsg}}!
<br />
Hi {}! (rootScope)
</div>

<script src=”/lib/angular.js”></script>
<script>
var app = angular.module(‘mytestApp’, []);

app.controller(‘MyFirstController’, perform ($scope, $rootScope) );

app.controller(‘MySecondController’, perform ($scope, $rootScope)
$scope.msg = ‘Good Night’;
$scope.TestName = $rootScope.title;
);
</script>
</physique>
</html>

AngularJS Coding Interview Questions

Do I would like to make use of Jquery in AngularJS?

No. No want to make use of Jquery in AngularJS.

How to make Http get request from AngularJS with an instance?

From AngularJS we are able to use “$http” service. Below is the pattern code for http get request –

$http.get(‘/MyURL’).
success(perform(knowledge, standing, headers, config) ).
error(perform(knowledge, standing, headers, config) );
42) How to make Http Post request from AngularJS with an instance?
Below is the pattern code for http post request –
$http.post(‘/ MyURL’, ).
success(perform(knowledge, standing, headers, config) ).
error(perform(knowledge, standing, headers, config) );

What is Dependency Injection (DI)?

Dependency Injection (DI) is the method of injecting all of the dependent objects reasonably than creating an occasion of dependent objects.

How Dependency Injection works in AngularJS?

As proven within the under pattern code “$scope” and “$http” objects are being injected in angular framework.

module.controller(‘MyTestController’, perform ($scope, $http) {
// injected dependencies
});

Explain validations accomplished in AngularJS?

AngularJS will leverage on HTML 5 validations. Below is the pattern code for required discipline validation.

Product Name :- <enter kind=textual content title=”ProdName” id=”ProdName” required />

How we are able to test for errors for particular discipline in AngularJS?

Using “$valid” property we are able to test the validity of the shape inside “ng-app” directive.

Explain Two-way binding in AngularJS?

“ng-model” is getting used for two-way mannequin binding. Whenever any change within the mannequin, view will probably be up to date mechanically and vice versa.

Eg:

<enter kind=”text” ng-model=”mytestname” />

AngularJS Basic Interview Questions

Explain One-way binding in AngularJS?

This kind of binding is being launched in angularJS model – 1.Three and double colon – “::” is used for one-time expression. Below is the instance of utilizing it –

Eg : {{:: mytestname }}

Give an instance of Data binding in AngularJS?

<div ng-app=”” ng-init=”quantity=10;cost=5″ class=”ng-scope”>
<b>Total Cost: {value * amount}</b>
</div>

List out the shape occasions in AngularJS?

Below are the checklist of occasions in AngularJS:

  • ng-dbl-click
  • ng-click
  • ng-mouseup
  • ng-mousedown
  • ng-mouseover
  • ng-mousemove
  • ng-mouseenter
  • ng-keypress and so forth.

What are the methods to trace the error in AngularJS?

Below are the methods to trace the error in AngularJS:
$error: This will state the precise error.
$soiled: This will point out if the worth is being modified.
$invalid: This will point out in case the worth entered is mistaken or invalid.

How to show the values in tables in AngularJS?

Below is the pattern code for exhibiting the info in desk –
<desk>
<tr>
<th>Product Name</th>
<th>Product Type</th>
</tr>
<tr ng-repeat=”product in category.products”>
<td>{ product.title }</td>
<td>{}</td>
</tr>
</desk>

AngularJS 1 Interview Questions

How to point out and conceal a management in AngularJS?

“ng-show” and “ng-hide” directives are getting used for exhibiting and hiding the controls respectively.

How to make use of “ng-click” directive in AngularJS?

“ng-click” directive is used for button management and under is the pattern code for a similar
<p>Total click on: { completeClicks }</p></td>
<button ng-click=”totalClicks = totalClicks + 1″>Click Me!</button>

How to embed one HTML web page into different in AngularJS?

HTML won’t help embedding one HTML web page into different. But this may be achieved utilizing following methods:

  • Using Server Side Includes
  • Using Ajax

How embedding one HTML web page into different may be achieved utilizing AJAX in AngularJS?

Server name may be accomplished to get the HTML web page from server aspect and set that within the InnerHTML of the management.

Explain RouteProvider in AngularJS?

RouteProvider is a key service for setting configuration urls and we are able to map them to coresponsing HTML pages.

Explain how routing works in AngularJS?

Routing permits to create totally different URL for various content in our utility. Different content for various URL permits to bookmark the URL of particular content and that is known as route and this mechanism is named routing.

AngularJS Interview Questions For Experienced Professionals

Explain string interpolation in AngularJS?

In AngularJS compilation, attributes and textual content matches utilizing interpolation providers to test whether or not they comprise any embedded expressions.

Explain the distinction between compile and link in AngularJS?

Compile: This perform is used for DOM manipulation and for amassing the directives.
Link: This perform is used for registering the DOM listeners and occasion of DOM manipulation. This will executed solely as soon as throughout template clone.

List out the type lessons which may be added with ng-model in AngularJS?

Below are the checklist of CSS lessons which can be utilized for styling:

  • ng- invalid
  • ng-pristine
  • ng- legitimate
  • ng-dirty

How to dynamically disable the button management in AngularJS?

Below is the pattern code to disable the button management based mostly on the checkbox chosen:

<div ng-app=”” ng-init=”isDisable=true”>
<p>
<button ng-disabled=”isDisable”>Click Me!</button>
</p>
<p>
<enter kind=”checkbox” ng-model=”isDisable”/>Button
</p>
</div>


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