AngularJS - Dependency Injection - test if module exists and if so add it

Question

Within my Angular App I want to inject two modules into my App through dependency injection. So:

var App = angular.module('App', ['ngModule1', 'ngModule2']);

var module1 = angular.module('ngModule1', ['App']);
var module2 = angular.module('ngModule2', ['App']);

However what if module2 doesn't exist yet or is not properly instantiated. I want to do something like this:

 var App = angular.module('App', ['ngModule1']);

   //Test if module2 exists
    try {
        var temp = $injector.get('ngModule2');
    } catch (e) {
        console.log('Injector does not have Module 2!');
    }

 //Do something with temp to add it in App

The method above isn't valid but I want to know the proper way to add in a module after testing if it exists

$injector.get is not for getting a module, it is for getting a factory etc..registered in the loaded module. I think what you need is manual bootstrapping. — PSL
– PSL, Commented Jul 30, 2015 at 17:57
@PSL I never did inject modules before so that is why I said the above code isn't valid. I know how to inject services but not modules — Jebathon
– Jebathon, Commented Jul 30, 2015 at 17:58

Estus Flask · Accepted Answer · 2015-07-30 18:49:43Z

2

It is possible to test and add it.

var modules = ['existingModule', 'nonexistentModule'].filter(function (module) {
  try {
    return !!angular.module(module);    
  } catch (e) {}
});

angular.module('module', modules);

It is also possible to redefine module, but do it before you defined its components and bootstrapped it.

var app;

try {
    app = angular.module('app', ['existingModule', 'debatableModule']);
} catch (e) {
    app = angular.module('app', ['existingModule']);
}

But it may (and most probably does) indicate that something is wrong with app design.

$injector doesn't serve this purpose and it can't help to 'inject' a module into existing one.

answered Jul 30, 2015 at 18:49

Estus Flask

226k79 gold badges478 silver badges620 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

AngularJS - Dependency Injection - test if module exists and if so add it

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related