Sharing data between controllers in AngularJS is a key feature that enables seamless

There are two controllers: one controller will write data into an object and the other controller needs to read it. Is it possible to have a global variable in my app.js file that can be accessed by both controllers? I'm unsure why one would need to use a service to share data between controllers.

var message = 'initial message'
app.controller('readController', function($scope){
      $scope.message = message
      console.log(message)
});
app.controller('writeController', function(){
      message = 'message has been written'
});

Shouldn't the change made in the write controller be reflected in the read controller? In that case, the console should display 'message has been written'.

Answer №1

If you want to access and modify data in $rootScope, you can do so without using a service for simple data operations. However, it's important to note that this approach may not be the most efficient design.

app.controller('readController', function($scope, $rootScope){
  $scope.myMsg = $rootScope.msg;
  console.log($scope.myMsg);
});

app.controller('writeController', function($rootScope){
  $rootScope.msg = 'message has been updated';
});

Answer №2

It is not recommended to utilize global variables for storing and sharing data across controllers. A better approach would be to use services or factories for a more straightforward solution.

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