Leveraging a third-party library in AngularJS to interact with a factory or service

My current challenge involves developing an application that is predominantly angular-based, but also incorporates some non-angular code. I have structured my code into modules, including various factories. One of these factories is specifically dedicated to logging and is utilized across different modules.

The issue arises when I need to access this logging factory from areas of the code that are not within the angular framework and therefore cannot leverage Angular's dependency injection mechanism.

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

app.factory('logger', function(){
   return {
       infos : [],
       logInfo : function(msg) { this.infos.push(msg); }
   };
});

app.controller('MyCtrl',['logger', function(logger){
   ...
   logger.logInfo("I can easily use the injected logger here");
   ...
}]);

/* Remaining parts of the app */

someLib.someMethod(function(){
   ...
   // var logger = angular.getFactory('logger') ?
   logger.logInfo("How do I access the logger from this non-angular section?");
   ...
});

I have managed to find a workaround for this issue, although it is not entirely ideal or secure:

// Global declaration of the logger
var logger = {
  infos : [],
  logInfo : function(msg) { this.infos.push(msg); }
};

// Still encapsulating it within a factory (even though its purpose is diminished now)
app.factory('logger', function(){
  return logger;
});

/* Remaining parts of the app */
someLib.someMethod(function(){
  ...
  logger.logInfo("Now that logger is global, it can be accessed from anywhere!");
  ...
});

Thus, the question remains: Is there a method to inject dependencies in sections of the code that are outside of Angular?

Answer №1

One approach I find effective is to assign the current application injector to the application module property for easy access later on. This can be conveniently done within the run block:

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

app.run(function($injector) {
    app.$injector = $injector;
});

Subsequently, when you need to retrieve a service from non-Angular code, you can utilize the following syntax:

var logger = app.$injector.get('logger');

Alternatively, you could also use:

var logger = angular.module('myApp').$injector.get('logger');

This setup allows for seamless usage of the logger throughout your application:

someLib.someMethod(function() {
    var logger = angular.module('myApp').$injector.get('logger');
    logger.logInfo("Having the logger globally accessible makes it easier to utilize from any part of the application!");
});

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