Recently, I decided to delve into the world of AngularJS. During my first tutorial sessions, I attempted to rename the $scope variable and quickly realized that it caused everything to break.
phonecatApp.controller('PhoneListCtrl', function($scope) { ... }); // this works
phonecatApp.controller('PhoneListCtrl', function(foo) { ... }); // this does not work
But why? Isn't it just a local variable being passed to the callback function? Why is a specific name required?
Angular utilizes variable injection, allowing it to derive the value based on the variable's name. This is why only using "$scope" will be effective.
This principle applies to parameters in controllers, services, and other components. When creating a custom service, for example, you must also inject it:
// Your service instance isn't directly obtained. Instead, include it in the function parameters
// and Angular will handle the injection.
phonecatApp.controller('PhoneListCtrl', function ($scope, SomeService) {
});
// Definition of your personalized service.
phonecatApp.factory('SomeService', function() {
});
For more information on Dependency Injection (DI) in Angular, refer to this informative article.
Here is one way to achieve the same result:
app.controller('ListController', ['$scope', function(bar) { ... }]);
Adopting this approach is highly recommended (using [''...] instead of renaming $scope to bar :-)) especially when planning to minify your javascript files in the future.
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