#13: 🚧 Refactor App Component

Last updated 6 months ago

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:

ng g c list-manager
  • 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!

src/app/app.component.ts
@Component({
selector: 'app-root',
template: `
<h1>
Welcome to {{ title }}!
</h1>
`,
styleUrls: ['./app.component.css']
})
export class AppComponent {
title = 'My To Do List APP';
}
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',
template: `
<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>
`,
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 });
}
}
  • Call the new component from the app-root template:

src/app/app.component.ts
template: `
<h1>
Welcome to {{ title }}!
</h1>
<app-list-manager></app-list-manager>
`,

That's it! Now we can go on.