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Essential Angular

You're reading from   Essential Angular Fast paced guide to Front-end web development with Angular

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Product type Paperback
Published in May 2017
Publisher Packt
ISBN-13 9781788293761
Length 108 pages
Edition 1st Edition
Tools
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Authors (3):
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Narwhal Technologies Inc Narwhal Technologies Inc
Author Profile Icon Narwhal Technologies Inc
Narwhal Technologies Inc
Jeff Cross Jeff Cross
Author Profile Icon Jeff Cross
Jeff Cross
Victor Savkin Victor Savkin
Author Profile Icon Victor Savkin
Victor Savkin
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Toc

Injector tree

Now you know that the dependency injection configuration has two parts:

  • Registering providers: How and where an object should be created.
  • Injecting dependencies: What an object depends on.

And everything an object depends on (services, directives, and elements) is injected into its constructor. To make this work the framework builds a tree of injectors.

First, every DOM element with a component or a directive on it gets an injector. This injector contains the component instance, all the providers registered by the component, and a few "local" objects (for example, the element).

Second, when bootstrapping an NgModule, Angular creates an injector using the module and the providers defined there.

So the injector tree of the application will look like this:

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