Question about angular.injector() API behavior

[Will Huang]

I feel confused about how angular.injector() get $injector component.  As I know, when calling to the angular.injector(['ng', 'app']); will get a new $injector object which is different from the current running Angular app's $injector object.

I made a sample app over here: (Angular 1.3.14)

http://codepen.io/willh/pen/vNYYRm?editors=101

I'm trying to create a new $injector by using the angular.injector() API.  I'd like to get a brand new $injector in order to get "version" service from getVersion function which is outside of the Angular app.  I was expected that controller shouldn't be run and shouldn't affect my version service object.  I just wanna get the "version" service object only.  In my sample, the value for "version" service has a "current" property and it's value is "0.0.1".  As you can see, there is a controller called "MainCtrl" that will change the version.current value at controller initialization.  When I calling to the getVersion function outside of the Angular app and I created a new $injector object.   In that function, I expected that I should get "0.0.1" but it didn't.  I've got "0.0.2".   I don't know why.  Does anyone know?

[Will Huang]

Does anyone know about this?  Thanks.

Will Huang於 2015年8月31日星期一 UTC+8上午2時18分53秒寫道：

[Sander Elias]

Hi Will,

It looks lite that the injector gets the already instantiated version of the module. Have a look at the  variation I made of your pen. That one delivers the 'right' version.  The lack of time/curiosity prevented me from looking over the $injectors source, but if you really want to know, the truth is in there!

Regards

Sander

[Will Huang]

I traced the Angular code. The loadModules() function looks like load the current running angular module so that although I created a new $injector object, I still get the service object from the current running Angular app.

Sander Elias於 2015年9月5日星期六 UTC+8下午12時51分56秒寫道：

[Sander Elias]

Hi Will,

That confirms my suspicion. If an app is already instantiated, the injector will get that, in stead of creating an new instance. Makes a lot of sense, but it's not what you where hoping for. Your goal is to be able to detect versions of parts of your app if I read your question right?

Regards

Sander 

[Will Huang]

Hi Sander,

Well, I'm not hoping for that.  I just want to confirm what's the exact behavior about how angular.injector() get $injector instance because the document is not saying much about this detail.  Actually, every time you call angular.injector(), you are truly get a new $injector instance, but this injector will get the service from the instanced modules if the app has been instantiated.

Sander Elias於 2015年9月9日星期三 UTC+8下午5時54分12秒寫道：

[Sander Elias]

Hi Will,

Well, then I can confirm that's indeed the expected behavior. At least in the NG1.x branch. It's the result of how the NG1 injecttion system works.

Regards

Sander