import { Component } from '@angular/core';
@Component({
selector: 'app-root',
templateUrl: './app.component.html'
})
export class AppComponent {
title = 'TEST-convinience';
}
In the code snippet above, the <app-root> selector in the index.html file is linked to the template app.component.html, resulting in the rendering of its view.
What are the advantages and benefits of this type of integration?
Alternatively, we could create a view using index.html.
Understanding Angular's bootstrap process is crucial in answering your question. When Angular initiates the application, it scans for the component(s) specified as 'bootstrap' in your root module:
The app startup by loading the following module first:
platformBrowserDynamic().bootstrapModule(AppModule);
Within that module, Angular seeks components listed in the bootstrap array:
@NgModule({
imports: [ BrowserModule, FormsModule ],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ] // this marks the next step
})
export class AppModule { }
Then, Angular examines the bootstrap component to identify its selector:
@Component({ selector: 'app-root', templateUrl: './app.component.html', }) export class AppComponent { }
Now Angular recognizes that it should locate
<app-root></app-root>AppComponent
<app-root>loading</app-root>
Assuming you aimed to make index.html the app component template, what content would you include in it? Placing <app-root> there will trigger an infinite loop as the component keeps generating within its own template. Omitting <app-root> raises the question of where to position it so Angular can determine where to initiate the app.
In essence, the root component must be integrated into a standard HTML document for Angular to identify the location on the webpage to construct the app.
I have some clarifications to make.
(1)Angular revolves around `components`. It employs a `hierarchy of components` as its core `architectural concept`.
(2)Modularity – significant core functionalities are now modular, resulting in a faster and lighter core.
Components primarily focus on a view of the application and logic on the page. A component consists of two crucial elements: a view(.html) and some logic(.ts).
In simple terms, components can be viewed as separate and autonomous views that can be utilized with other components (by passing component selector like <my-app></my-app>).
For example, if you create a 'calendar component' with all the necessary logic implemented and it works effectively as an individual component, you can then use this component in other 'modules' or even in any other 'app'.
So why do we pass the selector in index.html? Because:-
(1) When a new project is created in Angular using the command
ng new PROJECT-NAME (refer https://github.com/angular/angular-cli), by default a single module named app.module.ts (Parent Module) is created.
And, the selector of app.component.ts is automatically passed in index.html when a new project is created.
import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
if (environment.production) {
enableProdMode();
}
platformBrowserDynamic().bootstrapModule(AppModule)
.catch(err => console.log(err));
The answer to the question lies in main.ts of the project which is generated by default upon project creation.
main.ts :-1) Parent Module is imported as `import { AppModule } from './app/app.module';` (Since default single module created
2) By default ('default' refers to when a new project is created), then...
`platformBrowserDynamic().bootstrapModule(AppModule)`.
This statement bootstraps the Module which is passed as a parameter inside it (by default, 'AppModule').
This means it will load the `module` which is specified as the bootstraped parameter.
Now, in app.module.ts, the only default component created during the new project setup is app.component.ts. Now, to view, the template for app.component.ts i.e., app.component.html, the selector is passed as
<app-root></app-root>I hope that explanation helps clarify things.
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