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  • Registering services using Service in Angular.js

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    Hello All

    In today's blog post we would discuss the aspect of registering your custom services with AngularJS.
    It is essential to understand what are AngularJS services.


    Angular services are objects that are packed together using dependency injection. You can use services to organize and share code across your app.

    Use of Angular Service:

    • to have the data available through out the lifetime of the app.
    • to provide data to controllers consistently
    • to enable data and function sharing throughout the application.

    Features of service:

    • The instance of service is created only when some component of the application needs to use it.

    • The instance of a service is created only once in every app.

    A service can be created using the following methods:

    • service()
    • factory()
    • provider()
    • value()
    • constant()

    In this post we would discuss about using the service() method.

    To declare the service

    var module = angular.module('myapp', []);
    module.service('demoService', function(){
        this.users = [user1, user2, user3];

    A constant value as service can be registered in any of the Module type:

    • constant(name, value). It is used only for constants and to register configuration data.
    • value(name, value): It is used to register an existing instance of an object or function.

    In .service the methods of the service are created using this.methodname.

    Sample App:


    <div ng-app="app">
        <div ng-controller="CalculatorController">
            Enter a number:
            <input type="number" ng-model="number" />
            <button ng-click="doSquare()">X<sup>2</sup></button>
            <button ng-click="doCube()">X<sup>3</sup></button>
            <div>Answer: {{answer}}</div>


    var app = angular.module('app', []);
    app.service('MathService', function() {
        this.add = function(a, b) { return a + b };
        this.subtract = function(a, b) { return a - b };
        this.multiply = function(a, b) { return a * b };
        this.divide = function(a, b) { return a / b };
    app.service('CalculatorService', function(MathService){
        this.square = function(a) { return MathService.multiply(a,a); };
        this.cube = function(a) { return MathService.multiply(a, MathService.multiply(a,a)); };
    app.controller('CalculatorController', function($scope, CalculatorService) {
        $scope.doSquare = function() {
            $scope.answer = CalculatorService.square($scope.number);
        $scope.doCube = function() {
            $scope.answer = CalculatorService.cube($scope.number);

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