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Angular News Tuesday, July 3

Ivy engine in Angular: first in-depth look at compilation, runtime and change detection

  • As Kara explained in the keynote talk, the logic that instantiates components, creates DOM nodes, and runs change detection is implemented as an atomic unit she referred to as Angular Interpreter.
  • Here is a diagram that depicts the new execution model in Ivy: – So template instructions is where the logic that instantiates components, creates DOM nodes, and runs change detection lives now.
  • This means that DOM nodes are created as part of change detection too which differs from the current implementation.
  • Compilation – Similar to the current implementation, the role of a compiler in Ivy is to take metadata provided by a component decorator and produce a component definition.
  • Storing component definition – In the current compiler implementation a component definition (template data) lives in its own file independently of a component class.

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Ivy engine in Angular: first in-depth look at compilation, runtime and change detection

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

Total Guide To Dynamic Angular Animations That Can Be Customized At Runtime

  • Anatomy of Angular animations – Naive approach to runtime animation toggling and why it doesnt work – Working solution for runtime animation toggling (JIT and AOT compiler) – Creating generic solution for custom animation toggling scenarios – Verbosity of the final solution caused by the requirements of AOT compiler -…
  • The steps belong to two separate animations: – slide up / down of the whole page – staggered slide up of the marked new page elements – – Left: slide up / down of the whole page… Right: staggered slide up of the marked new pageelementsWe want to disable left…
  • Importing animations in the component file and using them in Component decoratorFollow me on Twitter because I want to be able to let you know about the newest blog posts and interesting frontendstuffThe SecondSolution – We learned that the animation steps cant be adjusted during runtime and that it doesn’t…
  • To accommodate for that we have to prepare two arrays of animation steps and define two transitions to execute appropriate one based on the current browser… – Creating two sets of animation steps and using transition function to determine which animation will run during the runtimeWe found a way to…
  • Angular compiler can rewrite some of the dynamic code like when using inline arrow function in useClass or useFactory but not in our case so we have to manually extract and export four different functions…Check out official documentation about Metadata rewriting…The final solution is then to export for simple function…

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Total Guide To Dynamic Angular Animations That Can Be Customized At Runtime

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Awesomely angular microspace magnificence

  • Microspace ships are one of my favorite things, and this Nebula-class Cruise Ship by Silmaril_1 reminds me just why I like them so much.
  • The combination of orange, white, and lovely shaping make this microscale ship quite pleasurable to admire.
  • Although the build appears to make great use of mostly common parts which just goes to show you can make an awesome build without buying tons of the latest pieces it notably uses a white window pane, with white glass held inside as a subtle detail of the front of…

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Awesomely angular microspace magnificence | The Brothers Brick

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JWT: The Complete Guide to JSON Web Tokens

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JWT: The Complete Guide to JSON Web Tokens

Animating Sprite Sheets With JavaScript

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Animating Sprite Sheets With JavaScript

Final classes in Java

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Final classes in Java

Get Url Parameter with Query String using angularjs • infinityknowledge

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Get Url Parameter with Query String using angularjs • infinityknowledge

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