In this video, learn how to use an InjectionToken for the custom provider value to make use of strong typing.
- [Narrator] So the inject decorator, … with it's string literal works, … but there is a better way to do this. … Relying on string literals for tokens … is always a bit of a risk. … They are harder to maintain, easier to mistype, … and code editors don't have much opportunity … to keep track of them to aid in refactoring. … Angular has a solution for this. … It's called an injection token. … You can use an injection token to tell Angular … you want to have a concrete type that can be passed around. … Let's refactor the look up list value type … to use an injection token. … First, let's create a new file … called providers.ts in the app folder. … And we'll move the look up list value instantiation … from the app module ts file … into this new file. … The provider metadata property in the app module … is going to need this look up list variable. … So let's add the export key word … in front of the const statement … so that we can import it in the app module file. … Okay, to create an injection token, …
- What is Angular?
- Working with components
- Binding events and properties
- Getting data to components
- Using directives and pipes
- Creating Angular forms
- Validating form data
- How Angular does dependency injection
- Making HTTP calls
- Styling components
Skill Level Intermediate
Angular: Building an Interfacewith Ray Villalobos2h 20m Intermediate
1. Architecture Overview
3. Directives and Pipes
5. Dependency Injection and Services
8. Styling Components
Next steps1m 20s
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