Struggling with the challenge of storing data in a factory and efficiently utilizing it across various controllers

As a newcomer to Angular, I have been using it for the past two months and now faced with the task of migrating from AngularJS to Angular in my project. The previous developer heavily relied on $rootScopes to store values across controllers, but I am opting to use services instead for a smoother transition to Angular.
I would appreciate it if you could review my code and point out any mistakes: plnkr code

Below is the snippet where I created a factory service and attempted to access it in other controllers. app.js

angular.module('myApp', [])
.factory('Data', function(){
  return {message: "I'm a data from a Service"}
});

first.js

angular.module('myApp', [])
       .controller(FirstCtrl, function($scope, $rootScope){
         $scope.data = Data;

       });

second.js

angular.module('myApp', [])
       .controller(SecondCtrl, function($scope){
         $scope.data = Data;
       });

Answer №1

Incorporating your factory into controllers is essential for proper functionality. Refer to this documentation for further details: https://docs.angularjs.org/guide/providers

Here is an example of how it should be implemented:

App.js

var app = angular.module('myApp', []);

app.factory('Data', function(){
  return {message: "I'm a data from a Service"}
});

app.controller('FirstCtrl', ['$scope', 'Data', function($scope, Data){
  $scope.data = Data.message;
}]);

And in the HTML file:

<html ng-app="myApp">
  <head>
    <title>AngularJS Services</title>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0-beta.5/angular.min.js"></script>
    <script type="text/javascript" src="app.js"></script>
  </head>
  <body>
    <div>
      <h1>Services</h1>
    </div>
    <div ng-controller ="FirstCtrl">
      {{data}}
    </div>
  </body>
</html>

Answer №2

Check out this helpful tutorial link for beginner developers who want to learn how to implement data sharing between two controllers:-

var app = angular.module('myApp', []);

app.factory('Data', function(){
  return {message: "This is data coming from a Service", error: "Oops, an error occurred :)"}
});

app.controller('FirstCtrl', ['$scope', 'Data', function($scope, Data){
  $scope.data = Data;
}]);

tutorial link here

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