How do I use $rootScope in Angular to store variables?

📝 Blog Post

👋 Hey there, Angular enthusiasts! Are you struggling with using $rootScope in Angular to store variables and access them in different controllers? 🤔 Don't you worry, we've got you covered! In this guide, we'll explore this common issue and provide you with easy solutions.

😕 Let's take a look at the context around the question. A developer reached out and asked, "How do I use $rootScope to store variables in a controller that I want to later access in another controller?" They provided an example code snippet:

angular.module('myApp').controller('myCtrl', function($scope) {
  var a = //something in the scope
  //put it in the root scope
});

angular.module('myApp').controller('myCtrl2', function($scope) {
  var b = //get var a from root scope somehow
  //use var b
});

🤔 The questioner wanted to store the value of variable a in $rootScope within the myCtrl controller and then access the stored value in the myCtrl2 controller. So, how can we make this work?

🔧 Solution: We need to utilize Angular's $rootScope to achieve variable storage across different controllers. Here's how you can do it:

1️⃣ Inject $rootScope into both controllers:

angular.module('myApp').controller('myCtrl', function($scope, $rootScope) {
  // ...
});

angular.module('myApp').controller('myCtrl2', function($scope, $rootScope) {
  // ...
});

2️⃣ Assign the value of a to $rootScope:

angular.module('myApp').controller('myCtrl', function($scope, $rootScope) {
  var a = // something in the scope
  $rootScope.a = a; // assign to $rootScope
});

3️⃣ Access and use the value of a from $rootScope in myCtrl2:

angular.module('myApp').controller('myCtrl2', function($scope, $rootScope) {
  var b = $rootScope.a; // get var a from $rootScope
  // use var b
});

🎉 That's it! You can now store the value of a in $rootScope and then access it in the myCtrl2 controller using $rootScope.a.

💡 Keep in mind that using $rootScope to store variables should be done judiciously as it can lead to potential code complexity and scope pollution. Consider alternative approaches like using services to share data between controllers.

📣 Call-to-Action: Now that you've learned how to use $rootScope to store variables in Angular, why not share this knowledge with your fellow developers? Click that share button below and spread the word. Also, don't hesitate to drop your questions or feedback in the comments section. Happy coding! 😄✨