AngularJS supports the concepts of “Separation of Concerns” using services architecture. Services are javascript functions and are responsible to do a specific tasks only. This makes them an individual entity which is maintainable and testable. Controllers, filters can call them as on requirement basis. Services are normally injected using dependency injection mechanism of AngularJS.

AngularJS provides many inbuilt services for example, $https:, $route, $window, $location etc. Each service is responsible for a specific task for example, $https: is used to make ajax call to get the server data. $route is used to define the routing information and so on. Inbuilt services are always prefixed with $ symbol.

There are two ways to create a service.

factory
service

Using factory method

Using factory method, we first define a factory and then assign method to it.

var mainApp = angular.module(“mainApp”, []);

mainApp.factory(‘MathService’, function() {

var factory = {};

factory.multiply = function(a, b) {

return a * b

}

return factory;

});

Using service method

Using service method, we define a service and then assign method to it. We’ve also injected an already available service to it.

mainApp.service(‘CalcService’, function(MathService) {

this.square = function(a) {

return MathService.multiply(a,a);

}

});

Example

Following example will showcase all the above mentioned directives.

testAngularJS.htm

<html>

<head>

<title>Angular JS Services</title>

</script>

</head>

<body>

<h2>AngularJS Sample Application</h2>

<p>Enter a number: <input type = “number” ng-model = “number” /></p>

<p>Result: {{result}}</p>

</div>

var mainApp = angular.module(“mainApp”, []);

mainApp.factory(‘MathService’, function() {

var factory = {};

factory.multiply = function(a, b) {

return a * b

}

return factory;

});

mainApp.service(‘CalcService’, function(MathService) {

this.square = function(a) {

return MathService.multiply(a,a);

}

});

mainApp.controller(‘CalcController’, function($scope, CalcService) {

$scope.square = function() {

$scope.result = CalcService.square($scope.number);

}

});

</script>

</body>

</html>

Result

Open textAngularJS.htm in a web browser. See the result.

So, this brings us to the end of blog. This Tecklearn ‘Services Architecture in Angular JS’ blog helps you with commonly asked questions if you are looking out for a job in Angular JS and Front-End Development. If you wish to learn Angular JS and build a career in Front-End Development domain, then check out our interactive, Angular JS Training, that comes with 24*7 support to guide you throughout your learning period. Please find the link for course details:

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What you will Learn in this Course?

Introduction to Angular

Introduction to Angular
Comparison between front-end tools
Angular Architecture
Building blocks of Angular
Angular Installation
Angular CLI
Angular CLI commands
Angular Modules

Angular Components and Data Binding

Working of Angular Applications
Angular App Bootstrapping
Angular Components
Creating A Component Through Angular CLI
Ways to specify selectors
Template and styles
Installing bootstrap to design application
Data Binding
Types of Data Binding
Component Interaction using @Input and @Output decorator
Angular Animations

TypeScript

What is TypeScript
Need of TypeScript
How to install TypeScript
Nodemon for monitoring changes
Interfaces in Class, String Templates, Maps,
Sets and Object Restructuring

Directives and Pipes in Angular

Angular Directives
@Component Directive
Structural Directives
Attribute Directives
Custom Directives
Pipes
Built-in Pipes
Chaining pipes
Custom pipes
Pipe Transform Interface & Transform Function
Pure and Impure pipes

Angular Services and Dependency Injection

Angular service
Need for a service
Dependency Injection
Creating a service
Hierarchical Injector
Injecting A Service into Another Service
Observables
RxJS Library
Angular’s Interaction with Backend
Parts of an Http Request
HttpClient

Forms in Angular

Forms in Angular
What are their functions
Advantages of Forms
Various Types of Forms
What is Angular Validation and Model driven approach

Angular Routing

Angular Routing
Angular Routing benefits and features
Building a single page application and updating it dynamically with Angular Routing
What is Parameter Routing
Router Lifecycle Hooks and Child Routes

Authentication and Security in Angular

What is Authentication?
Authentication and authorization
Types of Authentication
Where to store tokens?
JSON Web Tokens (JWT)
Authentication in Angular application
Security threats in web application

Testing Angular applications

Testing of Angular applications
Deployment of Angular Test Bed for testing on Angular framework
Setup of various tools for testing
Testing services in Angular Framework
E2E and Document Object Model testing

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