Adorning and utilizing the $rootScope functionality

Question

Adorning and utilizing the $rootScope functionality

Within my module's config, I have extended $rootScope by adding a function called safeApply.

$provide.decorator('$rootScope', ['$delegate', function($delegate) {
        $delegate.safeApply = function(fn) {
           ...
         };
         return $delegate;
         }
]);

Is it appropriate to access it like this:

 $scope.$root.safeApply();

Or do I need to inject $rootScope and then call it?

Can I incorporate this method into the prototype of $rootScope so that it is inherited by all $scope? If so, how can I achieve this?

Edit

Adding on to khanh's response below, it may be helpful to provide additional information. The purpose of the safeApply method is to manually trigger a digest cycle. The concept of decorating the $rootScope was inspired by this article. It involves enhancing functionality rather than just decorating a method, making it universally accessible within the scope of directives and controllers.

javascript angularjs

Answer 1

Answer №1

Utilizing decorators with services is a better approach than using scopes.

A decorator serves as a tool to envelop the original service and handle cross-cutting concerns such as caching, logging,.. while preserving the integrity of the service to focus on its core functionality without tainting it with this additional code.

An example implementation of a decorator would involve having a service defined in another module:

var lib = angular.module("lib",[]);
lib.service("util",function(){
     this.saveFile = function(file){
       console.log("save file:" + file);
     }
});

We can then utilize this service and apply our decorator logic for logging without cluttering the service with logging mechanisms:

app.config(function($provide) {
  $provide.decorator('util', function($delegate) {

    var originalSaveFile = $delegate.saveFile;

    $delegate.saveFile = function(file){
       console.log("before save file");
       originalSaveFile.apply(this,arguments);
       console.log("after save file");
    }

    return $delegate;
  });
});

DEMO

The concept of decorators draws inspiration from the decorator pattern and aspect oriented programming

In some scenarios, adding a function to $rootScope in the module's run block allows all scopes to inherit that function.

app.run(function($rootScope){
  $rootScope.safeApply = function(fn){
      console.log("safeApply");
  };
});

DEMO

Although possible, using a decorator in a manner like below might not align with the intended purpose as decorators are meant to create wrapper functionalities:

$provide.decorator('$rootScope', function($delegate) {

    $delegate.safeApply = function(fn){
      console.log("safe apply");
    }
    return $delegate;
  });

DEMO

Answer 2

Utilizing decorators with services is a better approach than using scopes.

A decorator serves as a tool to envelop the original service and handle cross-cutting concerns such as caching, logging,.. while preserving the integrity of the service to focus on its core functionality without tainting it with this additional code.

An example implementation of a decorator would involve having a service defined in another module:

var lib = angular.module("lib",[]);
lib.service("util",function(){
     this.saveFile = function(file){
       console.log("save file:" + file);
     }
});

We can then utilize this service and apply our decorator logic for logging without cluttering the service with logging mechanisms:

app.config(function($provide) {
  $provide.decorator('util', function($delegate) {

    var originalSaveFile = $delegate.saveFile;

    $delegate.saveFile = function(file){
       console.log("before save file");
       originalSaveFile.apply(this,arguments);
       console.log("after save file");
    }

    return $delegate;
  });
});

DEMO

The concept of decorators draws inspiration from the decorator pattern and aspect oriented programming

In some scenarios, adding a function to $rootScope in the module's run block allows all scopes to inherit that function.

app.run(function($rootScope){
  $rootScope.safeApply = function(fn){
      console.log("safeApply");
  };
});

DEMO

Although possible, using a decorator in a manner like below might not align with the intended purpose as decorators are meant to create wrapper functionalities:

$provide.decorator('$rootScope', function($delegate) {

    $delegate.safeApply = function(fn){
      console.log("safe apply");
    }
    return $delegate;
  });

DEMO

Adorning and utilizing the $rootScope functionality

Edit

Answer №1

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