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AngularJS Dependency Injection

AngularJS Dependency Injection Application

Enter a number:

Result: {{result}}

<!-- AngularJS provides a supreme Dependency Injection mechanism. It provides following core components which can be injected into each other as dependencies. value factory service provider constant-->
<html>
<head>
<title>AngularJS Dependency Injection</title>
</head>
<body>
<h2>AngularJS Dependency Injection Application</h2>
<div ng-app = "mainApp" ng-controller = "CalcController">
<p>Enter a number: <input type = "number" ng-model = "number" /></p>
<button ng-click = "square()">X<sup>2</sup></button>
<p>Result: {{result}}</p>
</div>
<script>
var mainApp = angular.module("mainApp", []);
//value
mainApp.config(function($provide) {
$provide.provider('MathService', function() {
this.$get = function() {
var factory = {};
factory.multiply = function(a, b) {
return a * b;
}
return factory;
};
});
});
mainApp.value("defaultInput", 5);
//factory
mainApp.factory('MathService', function() {
var factory = {};
factory.multiply = function(a, b) {
return a * b;
}
return factory;
});
//services
mainApp.service('CalcService', function(MathService){
this.square = function(a) {
return MathService.multiply(a,a);
}
});
//provider
mainApp.controller('CalcController', function($scope, CalcService, defaultInput) {
$scope.number = defaultInput;
$scope.result = CalcService.square($scope.number);
$scope.square = function() {
$scope.result = CalcService.square($scope.number);
}
});
</script>
</body>
</html>
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