Is app.component.ts necessary in an Angular 2 project?

Question

Is app.component.ts necessary in an Angular 2 project?

Currently diving into Angular 2 and have a burning question on my mind. Do I really need the app.component.ts file in my project? Each of my folders has its own component and template, so I'm debating if the main component is necessary or if I can remove it altogether.

Looking forward to your insights.

angular typescript

Answer 1

Answer №1

Remember: An Angular2 App requires at least one module and component to get started.

Is app.component.ts necessary?

Not necessarily. It's just the name of a .ts file, which can be any other component. However, you do need at least one module and component to start an Angular2 App.

Here are some key points to understand:

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';   //<<<==== importing AppModule class from app.module.ts file
const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);        //<<<===bootstrapping our AppModule here

app.module.ts // name of .ts file

//contents are important as it contains @NgModule({}) decorator.

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { SomeComponent }   from './some.component';  
                                           //<<<==== importing SomeComponent class from some.component.ts file to bootstrap it.


@NgModule({
  imports:      [ BrowserModule],
  declarations: [ SomeComponent ],         
  bootstrap:    [ SomeComponent ]          //<<<===bootstraping/initializing SomeComponent as our first component.
})
export class AppModule { }                 //<<<====imported AppModule (contains @NgModule decorator) in main.ts for bootstrapping this class with @NgModule() decorator.

some.component.ts //name of .ts file

import { Component } from '@angular/core';
import {UserService} from '../shared/shared.service';
@Component({
  selector: 'my-app',                       //<<<===make sure this matches with custom HTML tag used in index.html
  template: `<h1>Angular2</h1>  
  `
})
export class SomeComponent {}

Answer 2

Remember: An Angular2 App requires at least one module and component to get started.

Is app.component.ts necessary?

Not necessarily. It's just the name of a .ts file, which can be any other component. However, you do need at least one module and component to start an Angular2 App.

Here are some key points to understand:

main.ts

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';   //<<<==== importing AppModule class from app.module.ts file
const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);        //<<<===bootstrapping our AppModule here

app.module.ts // name of .ts file

//contents are important as it contains @NgModule({}) decorator.

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { SomeComponent }   from './some.component';  
                                           //<<<==== importing SomeComponent class from some.component.ts file to bootstrap it.


@NgModule({
  imports:      [ BrowserModule],
  declarations: [ SomeComponent ],         
  bootstrap:    [ SomeComponent ]          //<<<===bootstraping/initializing SomeComponent as our first component.
})
export class AppModule { }                 //<<<====imported AppModule (contains @NgModule decorator) in main.ts for bootstrapping this class with @NgModule() decorator.

some.component.ts //name of .ts file

import { Component } from '@angular/core';
import {UserService} from '../shared/shared.service';
@Component({
  selector: 'my-app',                       //<<<===make sure this matches with custom HTML tag used in index.html
  template: `<h1>Angular2</h1>  
  `
})
export class SomeComponent {}

Answer 3

Answer №2

It is important to have a single root component for bootstrapping your application.

The @NgModule.bootstrap property specifies AppComponent as the bootstrap component. This means that when Angular starts the application, it will render the HTML content of AppComponent in the DOM [https://angular.io/docs/ts/latest/guide/ngmodule.html#!#bootstrap]

Answer 4

It is important to have a single root component for bootstrapping your application.

The @NgModule.bootstrap property specifies AppComponent as the bootstrap component. This means that when Angular starts the application, it will render the HTML content of AppComponent in the DOM [https://angular.io/docs/ts/latest/guide/ngmodule.html#!#bootstrap]

Is app.component.ts necessary in an Angular 2 project?

Answer №1

Answer №2

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