Ví dụ về CRUD cho Angular 10 ( Frontend ) cho các bạn mới bắt đầu

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Posted on Thu, 08/19/2021 - 04:31
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Ví dụ dưới đây rất cơ bản để bắt đầu học về Angular 10 trở lên. Chúc các bạn theo nghề lập trình hạnh phúc.

Install Angular 10

npm install -g @angular/[email protected]

ng version

1 – Create app

ng new app-tutofox

Would you like to add Angular routing? (y/N): y

2 – Install bootstrap

ng add @ng-bootstrap/ng-bootstrap

3 – Create module

ng generate module person --routing

4 – Create component

ng generate component person/index
ng generate component person/create
ng generate component person/edit

5 – Create routes

src/app/person/person-routing.module.ts

import { IndexComponent } from './index/index.component';

import { CreateComponent } from './create/create.component';

import { EditComponent } from './edit/edit.component';  

const routes: Routes = [

  { path: 'person', redirectTo: 'person/index', pathMatch: 'full'},

  { path: 'person/index', component: IndexComponent },

  { path: 'person/create', component: CreateComponent },

  { path: 'person/edit/:idPerson', component: EditComponent } 

];

6 – Create interface

ng generate interface person/person

src/app/person/person.ts

export interface Person {

    id: number;

    name: string;

    email: string;

    phone: number;

}​

7 – Create services

ng generate service person/person

src/app/person/person.service.ts

import { Injectable } from '@angular/core';

import { HttpClient, HttpHeaders } from '@angular/common/http';​

import {  Observable, throwError } from 'rxjs';

import { catchError } from 'rxjs/operators';
​

import { Person } from './person';
​

@Injectable({

  providedIn: 'root'

})

export class PersonService {​

  private apiURL = "http://localhost:8000/api/person/";
​
  httpOptions = {

     headers: new HttpHeaders({

       'Content-Type': 'application/json'

     })

  }​

  constructor(private httpClient: HttpClient) { }
​

  getAll(): Observable<Person[]> {

   return this.httpClient.get<Person[]>(this.apiURL)

   .pipe(

     catchError(this.errorHandler)

   )

 }
​

 create(person): Observable<Person> {

   return this.httpClient.post<Person>(this.apiURL, JSON.stringify(person), this.httpOptions)

   .pipe(

     catchError(this.errorHandler)

   )

 }
​

 find(id): Observable<Person> {

   return this.httpClient.get<Person>(this.apiURL + id)

   .pipe(

     catchError(this.errorHandler)

   )

 }
​

 update(id, person): Observable<Person> {

   return this.httpClient.put<Person>(this.apiURL + id, JSON.stringify(person), this.httpOptions)

   .pipe(

     catchError(this.errorHandler)

   )

 }
​

 delete(id){

   return this.httpClient.delete<Person>(this.apiURL + id, this.httpOptions)

   .pipe(

     catchError(this.errorHandler)

   )
 }​

 errorHandler(error) {

   let errorMessage = '';

   if(error.error instanceof ErrorEvent) {

     errorMessage = error.error.message;

   } else {

     errorMessage = `Error Code: ${error.status}\nMessage: ${error.message}`;

   }

   return throwError(errorMessage);

 }​

}

​8 – Components

Component Index

src/app/person/index/index.component.ts

import { Component, OnInit } from '@angular/core';​

import { PersonService } from '../person.service';

import { Person } from '../person';​

@Component({

  selector: 'app-index',

  templateUrl: './index.component.html',

  styleUrls: ['./index.component.css']

})

export class IndexComponent implements OnInit {​

  persons: Person[] = [];

​  // constructor() { }

  constructor(public personService: PersonService) { }​

  ngOnInit(): void {

    this.personService.getAll().subscribe((data: Person[])=>{

      this.persons = data;

      console.log(this.persons);

    })

  }​

  deletePerson(id){

    this.personService.delete(id).subscribe(res => {

         this.persons = this.persons.filter(item => item.id !== id);

         console.log('Person deleted successfully!');

    })

  }
​

}

src/app/person/index/index.component.html

<section>​

    <div class="d-flex justify-content-between">

      <h4>List person</h4>

      <a routerLink="/person/create" class="btn btn-success">Create New Person</a>

    </div>​

    <br>    

    <table class="table ">

      <tr>

        <th>ID</th>

        <th>Name</th>

        <th>Email</th>

        <th>Phone</th>

        <th width="220px">Action</th>

      </tr>

      <tr *ngFor="let person of persons">

        <td>{{ person.id }}</td>

        <td>{{ person.name }}</td>

        <td>{{ person.email }}</td>

        <td>{{ person.phone }}</td>

        <td>

          <a href="#" [routerLink]="['/person/', 'edit', person.id  ]" class="btn btn-primary">Edit</a>

          <button type="button" (click)="deletePerson(person.id)" class="btn btn-danger">Delete</button>

        </td>

      </tr>

    </table>

 </section>

Component Create

src/app/person/create/create.component.ts

import { Component, OnInit } from '@angular/core';

import { PersonService } from '../person.service';

import { Router } from '@angular/router';

import { FormGroup, FormControl, Validators } from '@angular/forms';
​

@Component({

  selector: 'app-create',

  templateUrl: './create.component.html',

  styleUrls: ['./create.component.css']

})

export class CreateComponent implements OnInit {​

  form: FormGroup;​

  constructor(

    public personService: PersonService,

    private router: Router

  ) { }

​

  ngOnInit(): void {

​

    this.form = new FormGroup({

      name:  new FormControl('', [ Validators.required, Validators.pattern('^[a-zA-ZÁáÀàÉéÈèÍíÌìÓóÒòÚúÙùÑñüÜ \-\']+') ]),

      email: new FormControl('', [ Validators.required, Validators.email ]),

      phone: new FormControl('', [ Validators.required, Validators.pattern("^[0-9]*$") ])

    });​

  }​

  get f(){

    return this.form.controls;

  }​

  submit(){

    console.log(this.form.value);

    this.personService.create(this.form.value).subscribe(res => {

         console.log('Person created successfully!');

         this.router.navigateByUrl('person/index');

    })

  }​

}​

src/app/person/create/create.component.html

<div>​

  <div class="d-flex justify-content-between">

    <h4>Form customer</h4>

    <a href="#" routerLink="/person/index" class="btn btn-primaryt">Back</a>

  </div>​

  <hr/>

​    <form [formGroup]="form" (ngSubmit)="submit()">

​

        <div class="form-group row">

            <div class="col-md-6 ">

              <label for="title">Name:</label>

              <input

                formControlName="name"

                id="name"

                type="text"

                class="form-control">

              <div *ngIf="f.name.touched && f.name.invalid" class="alert alert-danger">

                  <div *ngIf="f.name.errors.required">*Name is required.</div>

                  <div *ngIf="f.name.errors.pattern">*The name must only contain letters.</div>

              </div>

            </div>

        </div>

​

        <div class="form-group row">

            <div class="col-md-6 ">

              <label for="email">Email:</label>

              <input

                formControlName="email"

                id="email"

                type="text"

                class="form-control">

              <div *ngIf="f.email.touched && f.email.invalid" class="alert alert-danger">

                  <div *ngIf="f.email.errors.required">*Email is required.</div>

                  <div *ngIf="f.email.errors.email">*The email must be a valid email address.</div>

              </div>

            </div>

        </div>

​

        <div class="form-group row">

            <div class="col-md-6 ">

              <label for="phone">Phone:</label>

              <input

                formControlName="phone"

                id="phone"

                type="text"

                class="form-control">

              <div *ngIf="f.phone.touched && f.phone.invalid" class="alert alert-danger">

                  <div *ngIf="f.phone.errors.required">*Phone is required.</div>

                  <div *ngIf="f.phone.errors.pattern">*The phone must only contain numbers.</div>

              </div>

            </div>

        </div>

​

        <button class="btn btn-primary" type="submit" [disabled]="!form.valid">Submit</button>

    </form>

</div>

​Component Edit

src/app/person/edit/edit.component.ts

import { Component, OnInit } from '@angular/core';​

import { PersonService } from '../person.service';

import { ActivatedRoute, Router } from '@angular/router';

import { FormGroup, FormControl, Validators} from '@angular/forms';

import { Person } from '../person';

​

@Component({

  selector: 'app-edit',

  templateUrl: './edit.component.html',

  styleUrls: ['./edit.component.css']

})

export class EditComponent implements OnInit {

​

  id: number;

  person: Person;

  form: FormGroup;

​

  constructor(

    public personService: PersonService,

    private route: ActivatedRoute,

    private router: Router

  ) { }

​

  ngOnInit(): void {

    this.id = this.route.snapshot.params['idPerson'];

    this.personService.find(this.id).subscribe((data: Person)=>{

      this.person = data;

    });

​

    this.form = new FormGroup({

      name:  new FormControl('', [ Validators.required, Validators.pattern('^[a-zA-ZÁáÀàÉéÈèÍíÌìÓóÒòÚúÙùÑñüÜ \-\']+') ]),

      email: new FormControl('', [ Validators.required, Validators.email ]),

      phone: new FormControl('', [ Validators.required, Validators.pattern("^[0-9]*$") ])

    });

​

  }

​

  get f(){

    return this.form.controls;

  }

​

  submit(){

    console.log(this.form.value);

    this.personService.update(this.id, this.form.value).subscribe(res => {

         console.log('Person updated successfully!');

         this.router.navigateByUrl('person/index');

    })

  }
​

}

​src/app/person/edit/edit.component.html

<div class="container">

  

    <div class="d-flex justify-content-between">

      <h4>Edit person</h4>

      <a href="#" routerLink="/person/index" class="btn btn-primaryt">Back</a>

    </div>

​

    <hr>

​

    <form [formGroup]="form" (ngSubmit)="submit()">

​

​

        <div class="form-group row">

            <div class="col-md-6 ">

              <label for="title">Name:</label>

              <input

                formControlName="name"

                [(ngModel)]="person.name"

                id="name"

                type="text"

                class="form-control">

              <div *ngIf="f.name.touched && f.name.invalid" class="alert alert-danger">

                  <div *ngIf="f.name.errors.required">*Name is required.</div>

                  <div *ngIf="f.name.errors.pattern">*The name must only contain letters.</div>

              </div>

            </div>

        </div>

​

        <div class="form-group row">

            <div class="col-md-6 ">

              <label for="email">Email:</label>

              <input

                formControlName="email"

                [(ngModel)]="person.email"

                id="email"

                type="text"

                class="form-control">

              <div *ngIf="f.email.touched && f.email.invalid" class="alert alert-danger">

                  <div *ngIf="f.email.errors.required">*Email is required.</div>

                  <div *ngIf="f.email.errors.email">*The email must be a valid email address.</div>

              </div>

            </div>

        </div>

​

        <div class="form-group row">

            <div class="col-md-6 ">

              <label for="phone">Phone:</label>

              <input

                [(ngModel)]="person.phone"

                formControlName="phone"

                id="phone"

                type="text"

                class="form-control">

              <div *ngIf="f.phone.touched && f.phone.invalid" class="alert alert-danger">

                  <div *ngIf="f.phone.errors.required">*Phone is required.</div>

                  <div *ngIf="f.phone.errors.pattern">*The phone must only contain numbers.</div>

              </div>

            </div>

        </div>​

        <button class="btn btn-primary" type="submit" [disabled]="!form.valid">Update</button>

    </form>

</div>​

9 – Configure person module

src/app/person/person.module.ts

import { NgModule } from '@angular/core';

import { CommonModule } from '@angular/common';

​

import { PersonRoutingModule } from './person-routing.module';

​

import { IndexComponent } from './index/index.component';

import { CreateComponent } from './create/create.component';

import { EditComponent } from './edit/edit.component';

​

import { FormsModule, ReactiveFormsModule } from '@angular/forms';

​

@NgModule({

  declarations: [

    IndexComponent,

    CreateComponent,

    EditComponent

  ],

  imports: [

    CommonModule,

    PersonRoutingModule,

    FormsModule,

    ReactiveFormsModule

  ]

})

export class PersonModule { }

​10 – Configure App

src/app/app.module.ts

import { BrowserModule } from '@angular/platform-browser';

import { NgModule } from '@angular/core';

import { HttpClientModule } from '@angular/common/http';​

import { AppRoutingModule } from './app-routing.module';

import { AppComponent } from './app.component';

​

import { PersonModule } from './person/person.module';

import { NgbModule } from '@ng-bootstrap/ng-bootstrap';

​

@NgModule({

  declarations: [

    AppComponent

  ],

  imports: [

    BrowserModule,

    AppRoutingModule,

    PersonModule,

    HttpClientModule,

    NgbModule

  ],

  providers: [],

  bootstrap: [AppComponent]

})

export class AppModule { }

src/app/app.component.html

<div class="container" style="padding:20px;">

    <h1 style="text-align:center;">

        <a href="/person/index"> Full Stack - Angular 10 & Laravel 8 </a>

    </h1>

    <hr>

  <main>

  <router-outlet></router-outlet>

  </main>

</div>

​Xem tiếp phần xây dựng Backend Laravel 8

>> Tiếp nối phần Frontend bằng Angular nay mình học Laravel 8 ( Backend )

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