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Angular News Saturday, June 30

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What you always wanted to know about Angular Dependency Injection tree

  • Tip: to get element injector just open console and write:Resolution algorithm – The code that describes Angular dependency resolution algorithm within view can be found here.
  • If we have root AppComponent with template child/child, then we have three views: – HostView_AppComponent – some contentThe resolution algorithm is based on view hierarhy: – If we ask for some token in child component it will first look at child element injector, where checks then goes up through all…
  • To get view parent element Angular uses the following function: – For instance, lets imagine the following small angular app: – Assume that we are inside grid-tile component and asking for GridListComponent.
  • Each time we provide any token on an element, angular creates new allProviders and publicProviders array inherited from parent node, otherwise it just shares the same array with parent node.It means that grid-tile has already known about all providers that were registered on all parent elements within current view.
  • Basically, heres how angular collects providers for elements within template: – As we can see above, grid-tile can successfully get GridListComponent from its element injector through allProviders because grid-tile element injector contains providers from parent element.

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What you always wanted to know about Angular Dependency Injection tree

Angular Elements: how does this magic work under the hood?

  • The @angular/elements package provides the functionality to convert Angular Components to native Web Components using the Custom Elements API.
  • Exposing an Angular component as a CustomElement – Now that weve seen all thats involved in implementing an HTML Custom Element, lets implement the same functionality using Angular and then make this functionality available as a Custom Element.
  • First lets start out with a simple Angular Component: – As you can see, it does exactly the same as the Custom Element implemented above.
  • This Bridge will connect Angular Component to Custom Element.
  • Heres a quick synopsis of the modules in Angular Elements and how it relates to what we did in this this module implements the Custom Element callbacks we discussed in this article, and initializes an NgElementStrategy as the bridge to connect our Angular Component to Custom Elements.

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Angular Elements: how does this magic work under the hood?

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