Angular 4 - The Basics 笔记（2）: Component

• How to create a new component manually

1. create folder for your component: /src/app/yourComponent
2. create ts and html file: /src/app/yourComponent/name.component.ts & name.component.html
   1. edit name.component.ts

      //add component function
      import {Component} from '@angular/core';
       
      //config this component for angular
      @Component({
          selector: 'app-name', //html tag <app-name></app-name>
          selector: '[app-name]' //attribute <div app-name></div>
          selector: '.app-name' //class <div class="app-name"></div>
      
          templateUrl: './name.component.html', //external html file
          template: '<h1>hello</h1>', //or use inline html
      
          styleUrls: '['./name.component.css']', //externam css file
          styles: ['p{color: darkblue}'], //inline style
      
      })
      
      //normal typescript class
      export class NameComponent{
         
      }

       

       

       

       

3. edit /src/app/app.module.ts

   //tell typescript where to find it, no need for .ts extendsion
   import { NameComponent } from './yourComponent/name.component';
   
   @NgModule({
     declarations: [
       AppComponent,
       //tell angular we have a new component to use
       NameComponent
     ],

　　　　

• How to create a component from CLI

  • ng generate component name
    
    or
    
    ng g c name

     

     

• How to use component

  • 　　edit app.component.html

    <app-header></app-header>
    <div app-name></div>
    <div class="app-header"></div>