Angular is a powerful framework for building web applications, developed and maintained by Google. Initially created as an HTML extension for dynamic applications, Angular has evolved into a comprehensive platform for building scalable, efficient single-page applications (SPAs). Utilizing TypeScript and a component-based architecture, Angular offers tools for creating complex, interactive user interfaces and managing application state.
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import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http';
import { Observable } from 'rxjs';
@Injectable()
export class MyHttpInterceptor implements HttpInterceptor {
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
// Here we modify the request
const modifiedReq = req.clone({
headers: req.headers.set('Authorization', 'My value'),
});
// Here we pass the request on
return next.handle(modifiedReq);
}
}
@NgModule({
...
providers: [
{ provide: HTTP_INTERCEPTORS, useClass: MyHttpInterceptor, multi: true },
],
...
})
export class AppModule { }
<!--parent.component.html-->
<app-child [childMessage]="parentMessage"></app-child>
// parent.component.ts
parentMessage = "Hello from parent";
// child.component.ts
import {Component,Input } from '@angular/core';
//..
@Input() childMessage: string;
<!--parent.component.html-->
<app-child (messageEvent)="receiveMessage($event)"></app-child>
// parent.component.ts
receiveMessage($event) {
this.message = $event
}
// child.component.ts
import { Component, Output, EventEmitter } from '@angular/core';
//..
@Output() messageEvent = new EventEmitter<string>();
<form>
<label for="name">Name:</label>
<input id="name" [(ngModel)]="person.name">
<label for="age">Age:</label>
<input id="age" [(ngModel)]="person.age">
</form>
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