#13: 🚧 Refactor App Component

We're going to perform a small refactoring. The app-root shouldn't have such a large template and all this logic. It should just call another component that will deal with that.

• Create a new component called list-manager:

StackBlitz Instructions

Use the Angular Generator to create the component, then make the component use an inline template. Continue with the remaining instructions on this page.

• Move all the code from app-root to list-manager.

• You can keep the title in app-root, and give it a nice value.

• Be careful not to change the list manager component's class name!

TypeScript

src/app/app.component.ts

@Component({
  selector: 'app-root',
  templateUrl: `./app.component.html`,
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  title = 'My To Do List APP';
}

HTML

src/app/app.component.html

<h1>
    Welcome to {{ title }}!
</h1>

TypeScript

src/app/list-manager/list-manager.component.ts

import { Component, OnInit } from '@angular/core';
import { TodoItem } from '../interfaces/todo-item';

@Component({
  selector: 'app-list-manager',
  templateUrl: `./list-manager.component.html`,
  styleUrls: ['./list-manager.component.css']
})
export class ListManagerComponent implements OnInit {
  todoList: TodoItem[] = [
    {title: 'install NodeJS'},
    {title: 'install Angular CLI'},
    {title: 'create new app'},
    {title: 'serve app'},
    {title: 'develop app'},
    {title: 'deploy app'},
  ];

  constructor() { }

  ngOnInit() {
  }

  addItem(title: string) {    
    this.todoList.push({ title });
  }
}

HTML

src/app/list-manager/list-manager.component.html

<app-input-button-unit 
  (submit)="addItem($event)">
</app-input-button-unit>

<ul>
  <li *ngFor="let todoItem of todoList">
    <app-todo-item [item]="todoItem"></app-todo-item>
  </li>
</ul>

• Call the new component from the app-root template:

src/app/app.component.html

<h1>
    Welcome to {{ title }}!
</h1>

<app-list-manager></app-list-manager>

That's it! Now we can go on.

💾 Save your code

You can just press Ctrl + S(On Windows) or Cmd + S(On Mac.)

Press Save in the toolbar and continue to the next section of the tutorial.

See the results on StackBlitz