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The basic building blocks of an Angular application are: NgModules, which provide a compilation context for components, NgModules collect related code into functional sets.
_____ define views Components, which are sets of screen elements that Angular can choose among and modify according to your program logic and data. Every app has at least a root component.
_____ use services Components, which provide specific functionality not directly related to views. Service providers can be injected into components as dependencies, making your code modular, reusable, and efficient.
Both components and services are simply classes, with _____ that mark their type and provide metadata that tells Angular how to use them. decorators
Metadata for a component class Which associates it with a template that defines a view. A template combines ordinary HTML with Angular directives and binding markup that allow Angular to modify the HTML before rendering it for display.
Metadata for a service class Which provides the information Angular needs to make it available to components through Dependency Injection (DI).
@Component + ? The @Component decorator identifies the class immediately below it as a component, and provides the template and related component-specific metadata.
What are Decorators? Decorators are functions that modify JavaScript classes. Angular defines a number of such decorators that attach specific kinds of metadata to classes, so that it knows what those classes mean and how they should work.
@Injectable + ? A service class definition is immediately preceded by the @Injectable decorator.
What does service class do? For data or logic that is not associated with a specific view, and that you want to share across components, you create a service class.
Router NgModule is a _____ service
What is NgModule An NgModule is a container for a cohesive block of code dedicated to an application domain, a workflow, or a closely related set of capabilities.
What does NgModule contains It can contain components, service providers, and other code files whose scope is defined by the containing NgModule.
Modules' importnat properties delcarations(componeents, directives, pipes), exports, imports, providers(often specified at component level), bootstrap
host view When you create a component, it is associated directly with a single view, called the host view. The host view can be the root of a view hierarchy, which can contain embedded views, which are in turn the host views of other components.
How to inject data in Angular In Angular, you can inject data only via a constructor’s arguments. If you see a class with a no-argument constructor, it’s a guarantee that nothing is injected into this component.
Created by: zhangtai