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Accelerating Angular Development with Ivy

You're reading from   Accelerating Angular Development with Ivy A practical guide to building faster and more testable Angular apps with the new Ivy engine

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Product type Paperback
Published in Oct 2021
Publisher Packt
ISBN-13 9781800205215
Length 242 pages
Edition 1st Edition
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Authors (3):
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Lars Gyrup Brink Nielsen Lars Gyrup Brink Nielsen
Author Profile Icon Lars Gyrup Brink Nielsen
Lars Gyrup Brink Nielsen
Jacob Andresen Jacob Andresen
Author Profile Icon Jacob Andresen
Jacob Andresen
Mateus Carniatto Mateus Carniatto
Author Profile Icon Mateus Carniatto
Mateus Carniatto
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Toc

Table of Contents (14) Chapters Close

Preface 1. Chapter 1: Discovering New APIs and Language Syntax 2. Chapter 2: Boosting Developer Productivity Through Tooling, Configuration, and Convenience FREE CHAPTER 3. Chapter 3: Introducing CSS Custom Properties and New Provider Scopes 4. Chapter 4: Exploring Angular Components Features 5. Chapter 5: Using CSS Custom Properties 6. Chapter 6: Using Angular Components 7. Chapter 7: Component Harnesses 8. Chapter 8: Additional Provider Scopes 9. Chapter 9: Debugging with the New Ivy Runtime APIs 10. Chapter 10: Using the Angular Compatibility Compiler 11. Chapter 11: Migrating Your Angular Application from View Engine to Ivy 12. Chapter 12: Embracing Ahead-of-Time Compilation 13. Other Books You May Enjoy

Inspecting an embedded view context

A structural directive is used to add and remove elements to the DOM throughout the lifecycle of a component. They create an embedded view, which is bound to a view context. This is the case of the NgIf and NgFor directives that are part of the Angular framework.

Important Note

Only one structural directive can be attached to an element. If you need to apply multiple structural directives, wrap the element in the special <ng-container> element, attach the outer structural directive to this element, and so on.

When we pass an element with a structural directive attached to ng.getContext, it returns the view context. For example, when we pass an element with an NgIf directive attached to it, NgIfContext is returned, which has the following shape:

interface NgIfContext {
  $implicit: boolean;
  ngIf: boolean;
}

The embedded view that is dynamically created by NgIf is bound to the $implicit property of NgIfContext...

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