Angular
  • Angular learning
  • Angular
    • Change Detection
      • Angular Change Detection Strategies
      • Understanding Change Detection Strategy in Angular
    • Angular Components Overview
      • Lifecycle hooks
      • View encapsulation
    • Text interpolation
    • Pipes
    • ARIA
    • Event binding
    • Directives
    • Dependency injection in Angular
    • Difference between Template-Driven and Reactive Forms
    • Guards
    • Resolvers
      • Resolver example
  • Memory management in Angular applications
  • Renderer2
  • Angular test
    • Testing
      • The different types of tests
      • Some testing best practices
      • Angular Service Testing in Depth
        • About Jasmine
        • Jasmine - Test suites
        • Implementation of First Jasmine Specfication
        • spyOn() & jasmine.createSpyObj()
        • beforeEach()
        • Testing services
        • Disabled and Focused Tests
        • flush
        • HttpTestingController
        • Sample code
      • Angular Component Testing in Depth
        • Intro to Angular Component testing
        • DOM interaction
        • Trigger Change Detection
        • Test Card List Test Suite Conclusion
        • Window.requestAnimationFrame()
        • Asynchronous Work (Jasmine)
        • Cooperative asynchronous JavaScript: Timeouts and intervals
        • FakeAsync - Asynchronous Work (Jasmine) part 2
        • tick()
        • Sample codes
      • Testing Promised-based code-intro Microtasks
        • Microtasks
        • Micro-tasks within an event loop (Summary)
        • Macro-tasks within an event loop (Summary)
        • Test promised Microtasks (code)
      • Using fakeAsync to test Async Observables
      • Cypress.io
        • Create our first e2e test
      • Angular CLI code coverage and deployment in prod mode.
      • Travis CI
  • Angular best practices
    • Angular best practices
      • Security
      • Accessibility in Angular
      • Keeping your Angular projects up-to-date
    • Bootstrapping an Angular Application
      • Understanding the File Structure
      • Bootstrapping Providers
    • Components in Angular
      • Creating Components
      • Application Structure with Components
        • Accessing Child Components from Template
        • Using Two-Way Data Binding
        • Responding to Component Events
        • Passing Data into a Component
      • Projection
      • Structuring Applications with Components
      • Using Other Components
  • Reactive extensions
    • RxJS
      • RxJS Operators
      • of
      • Observable
      • async pipe (Angular)
      • Interval
      • fromEvent
      • Pipe
      • Map
      • Tap
      • ShareReplay
      • Concat
      • ConcatMap
      • Merge
      • MergeMap
      • ExhaustMap
      • fromEvent
      • DebounceTime
        • Type Ahead
      • Distinct Until Changed
      • SwitchMap
      • CatchError
      • Finalize
      • RetryWhen
      • DelayWhen
      • ForkJoin
      • First
      • Interview Questions
      • Zip
  • NgRx
    • What's NgRx
      • Actions
      • Reducers
      • Selectors
      • 🙅‍♂️Authentication guard with NgRX
      • @ngrx/effects
        • Side-Effect refresh survivor
  • Interview Q&A
    • Angular Unit Testing Interview Questions
    • Angular Questions And Answers
  • Angular Advanced
    • Setting up our environment
      • Understanding Accessors (TS)
      • The host & ::ng-deep Pseudo Selector
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  1. Angular best practices

Components in Angular

The core concept of any Angular application is the component. In effect, the whole application can be modeled as a tree of these components.

This is how the Angular team defines a component:

A component controls a patch of screen real estate that we could call a view, and declares reusable UI building blocks for an application.

Basically, a component is anything that is visible to the end user and which can be reused many times within an application.

In Angular 1.x we had router views and directives which worked sort of like components. The idea of directive components became quite popular. They were created by using directive with a controller while relying on the controllerAs and bindToController properties. For example:

angular.module('ngcourse')
  .directive('ngcHelloComponent', () => ({
      restrict: 'E',
      scope: { name: '=' },
      template: '<span>Hello, {{ ctrl.name }}.</span>',
      controller: MyComponentCtrl,
      controllerAs: 'ctrl',
      bindToController: true
    })
  );

In fact, this concept became so popular that in Angular 1.5 the .component method was introduced as syntactic sugar.

angular.module('ngcourse')
  .component('ngcHelloComponent', {
    bindings: { name: '=' },
    template: '<span>Hello, {{ $ctrl.name }}.</span>',
    controller: MyComponentCtrl
  });
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Last updated 4 years ago

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