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Angular 7 Firebase5 CRUD Operations with Reactive Forms

Rawat Digamber /  Read Time: 21 minutes

Angular 7 Firebase CRUD Operations

In this tutorial, I am going to share with you how to create Angular 7 Firebase5 CRUD Operations using Reactive Forms.

For the demo purpose, I’m going to create a basic student record management system app in which a school admin can do the following things.

  • Create Student
  • Read Student
  • Update Student
  • Delete Student

1. Project Demo

2. GitHub Project Files + Project Demo Link

GitHub ResourcesProject Demo

3. Technologies used

  • Node 8.11.1
  • Angular CLI 7.0.1
  • Angular 7.0.1
  • Firebase 5.5.5
  • Bootstrap 4.1.3
  • Font Awesome
  • NGX Toastr 9.1.1
  • NGX Pagination 3.2.1
  • RxJS 6.3.3
  • Typescript 2.7.2

4. Prerequisite

– Setup Node JS development environment

Before we move ahead I’m assuming you already have Node JS development environment set up in your system.

Please follow this link How to Set up Node JS Development Environment?

– Install Angular CLI

Install Angular CLI, Ignore if Angular CLI is already installed.

npm install -g @angular/cli

5. Angular Project Set up with Bootstrap 4 and Font Awesome

Let’s set up a fresh new Angular 7 project with Bootstrap 4 and Font Awesome for our basic student record management system CRUD app.

ng new angularfirebase-student-app

Once the project is installed then get into the project’s directory by following the following command.

cd angularfirebase-student-app

Now its time to setup Bootstrap CSS framework in your Angular project. Use the mentioned command to install the latest version of the Bootstrap framework.

npm install bootstrap

Install Font Awesome icons set library using Angular CLI

npm install @fortawesome/fontawesome-free-webfonts

Once, the Bootstrap and Font Awesome icon set is successfully installed. Then go to angular.json file and paste the given below code in styles array.

"styles": [
              "node_modules/bootstrap/dist/css/bootstrap.min.css",
              "src/styles.css",
              "node_modules/@fortawesome/fontawesome-free-webfonts/css/fontawesome.css",
              "node_modules/@fortawesome/fontawesome-free-webfonts/css/fa-regular.css",
              "node_modules/@fortawesome/fontawesome-free-webfonts/css/fa-brands.css",
              "node_modules/@fortawesome/fontawesome-free-webfonts/css/fa-solid.css",
              "node_modules/ngx-toastr/toastr.css"
 ],

Please don’t forget to restart the server. When you make any changes in the angular.json file. Otherwise, changes won’t reflect in your Angular project. First close the server then use the following command in Angular CLI.

ng serve --open

Go through this article to know more about a detailed explanation on setting up the Angular project using external dependencies from scratch.

6. Firebase Account Set up + AngularFire2 Library Integration

Go to Firebase website login using your email id. When you see given below screen click on Add Project section.
Setup Google Firebase

Afterward, Enter your project name, accept the terms and condition and click on create a project button.
Firebase setup

Once your project is set up, then click on your project then you’ll see in your admin dashboard navigate to Develop > Authentication > Web setup then click on the web setup button, and a popup will appear along with your firebase credentials.

Copy your firebase credentials from here.
Firebase Details

Change your Firebase database rules, go to Database > Rules. Otherwise, you won’t be able to access the data without authentication.

Note: Don’t forget to change these rules when you are building a real app for your clients.

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

Now setup Firebase (AngularFire2 library) in your Angular project.

Run the given below cmd in Angular CLI.

npm install firebase @angular/fire --save

Let’s connect the AngularFire2 library to your Angular project.

Go to src/environments/enviorment.ts and enviorment.prod.ts files in your project’s
enviornments folder. Then add your firebase configuration details in both the environment files as given below.
Firebase Credentials Setting

Open app.module.ts file and register the Firebase required services.

// Firebase Modules
import { AngularFireModule } from '@angular/fire';
import { AngularFireDatabaseModule } from '@angular/fire/database';
import { environment } from '../environments/environment';

@NgModule({
  imports: [
    AngularFireModule.initializeApp(environment.firebase), // Main Angular fire module 
    AngularFireDatabaseModule  // Firebase database module 
  ]
})

We’ve successfully set up the Angular project with Firebase NoSQL real-time database.

7. Create CRUD operations with Firebase API

Before writing the CRUD operations we must create a separate folder by the name of shared within src > app > shared and create crud.service.ts (Service) and student.ts (Interface Class) into it.

Run the following command to generate student interface class for setting up data types.

ng g i shared/student  // Generates student interface class within shared folder

Afterwards, go to src > app > shared > student.ts file and add the following code into it.

export interface Student {
   $key: string;
   firstName: string;
   lastName: string;
   email: string
   mobileNumber: Number;
}

Run the following command to generate a CRUD service file.

ng g s shared/crud  // Generates CRUD service within shared folder

Go to src > app > shared > crud.service.ts file and add the given below code to create CRUD
operations with Firebase API.

import { Injectable } from '@angular/core';
import { Student } from '../shared/student';  // Student data type interface class
import { AngularFireDatabase, AngularFireList, AngularFireObject } from '@angular/fire/database';  // Firebase modules for Database, Data list and Single object

@Injectable({
  providedIn: 'root'
})

export class CrudService {
  studentsRef: AngularFireList<any>;    // Reference to Student data list, its an Observable
  studentRef: AngularFireObject<any>;   // Reference to Student object, its an Observable too
  
  // Inject AngularFireDatabase Dependency in Constructor
  constructor(private db: AngularFireDatabase) { }

  // Create Student
  AddStudent(student: Student) {
    this.studentsRef.push({
      firstName: student.firstName,
      lastName: student.lastName,
      email: student.email,
      mobileNumber: student.mobileNumber
    })
  }

  // Fetch Single Student Object
  GetStudent(id: string) {
    this.studentRef = this.db.object('students-list/' + id);
    return this.studentRef;
  }

  // Fetch Students List
  GetStudentsList() {
    this.studentsRef = this.db.list('students-list');
    return this.studentsRef;
  }  

  // Update Student Object
  UpdateStudent(student: Student) {
    this.studentRef.update({
      firstName: student.firstName,
      lastName: student.lastName,
      email: student.email,
      mobileNumber: student.mobileNumber
    })
  }  

  // Delete Student Object
  DeleteStudent(id: string) { 
    this.studentRef = this.db.object('students-list/'+id);
    this.studentRef.remove();
  }
  
}

8. Generate Angular Components for Adding, Updating & Creating Student Data

ng g c add-student

ng g c edit-student

ng g c student-list

Now we are able to write our app logic in these components.

9. Router Service Set up for Navigation

Generate app routing module for navigation using below command

  • –flat adds the file in src/app instead of its own folder.
  • –module=app orders Angular CLI to register it in the imports array of the AppModule.
ng generate module app-routing --flat --module=app

Once the app-routing module is created then Go to src > app > app-routing.modules.ts file and add the given below code.

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

// Use RouterModule, Routes for activating routing in angular
import { RouterModule, Routes } from '@angular/router';

// Include components for in which router service to be used
import { AddStudentComponent } from './add-student/add-student.component';
import { StudentsListComponent } from './students-list/students-list.component';
import { EditStudentComponent } from './edit-student/edit-student.component';

// Routes array define component along with the path name for url
const routes: Routes = [
  { path: '', redirectTo: '/register-student', pathMatch: 'full' },
  { path: 'register-student', component: AddStudentComponent },
  { path: 'view-students', component: StudentsListComponent },
  { path: 'edit-student/:id', component: EditStudentComponent }
];

// Import RouterModule and inject routes array in it and dont forget to export the RouterModule
@NgModule({
  imports: [CommonModule,RouterModule.forRoot(routes)],
  exports: [RouterModule],
  declarations: []
})
export class AppRoutingModule { }

Afterwards, Go to src > app > app.modules.ts and add the following code into app.module.ts.

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

@NgModule({
  
  imports: [
    AppRoutingModule  // Declare AppRoutingModule into imports array
  ]

})

Now go to src > app > app.component.html file to activate router service and layout for the student demo app.

<!-- Top navigation -->
<nav class="navbar navbar-dark fixed-top bg-dark flex-md-nowrap p-0 shadow">
  <a class="navbar-brand col-sm-3 col-md-2 mr-0" routerLink="/register-student">
    <img class="brand-logo" src="assets/logo-positronx-white.svg" alt="positronX.io Logo">
    <span class="dasboard-text">Dashboard</span>
  </a>
  <ul class="navbar-nav px-3">
    <li class="nav-item text-nowrap">
      <a class="nav-link" routerLink="/register-student">
        <span class="user-image" style="background-image: url('assets/user.jpg')"></span>
        Hello Admin
      </a>
    </li>
  </ul>
</nav>

<!-- Sidebar navigation -->
<div class="container-fluid">
  <div class="row">
    <nav class="col-md-2 d-md-block bg-light sidebar">
      <div class="sidebar-sticky">
        <ul class="nav flex-column">

          <!-- routerLink="/register-student" to navigate to view-students component -->
          <li class="nav-item">
            <a class="nav-link" routerLink="/register-student" routerLinkActive="active">
              <i class="fas fa-plus"></i>Add Student
            </a>
          </li>

          <!-- routerLink="/view-students" to navigate to view-students component -->
          <!-- routerLinkActive="active" activates active class for component-->
          <li class="nav-item">
            <a class="nav-link" routerLink="/view-students" routerLinkActive="active">
              <i class="fas fa-list-ul"></i>Students List
            </a>
          </li>
        </ul>
      </div>
    </nav>

    <!-- Main content -->
    <main role="main" class="col-md-9 ml-sm-auto col-lg-10 px-4">
      <div class="inner-adjust">

        <!-- Use router template to show the components for which router service is activated -->
        <router-outlet></router-outlet>

      </div>
    </main>

  </div>
</div>

10. Integrate NGX-Toastr Module to Show Alert Messages

We’ll be requiring NGX Toastr NPM module to show alert messages when an update occurs in student’s data. In order to install NGX Toastr, we’ll be using the following command.

npm install ngx-toastr --save

// @angular/animations package is a required dependency for the default toast
npm install @angular/animations --save

Then go to angular.json and add the following code in styles array.

"styles": [
  "node_modules/ngx-toastr/toastr.css" // Includes ngx-toastr's css
]

Go to app.moudule.ts file and include this code for NGX Toastr

// Import below modules for NGX Toastr
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { ToastrModule } from 'ngx-toastr';
 
@NgModule({
  imports: [
    BrowserAnimationsModule, // required animations module
    ToastrModule.forRoot() // ToastrModule added
  ]
})
class MainModule {}

How to use NGX-Toastr in the ANgular Component?

import { ToastrService } from 'ngx-toastr';
 
@Component({...})
export class YourComponent {
  constructor(private toastr: ToastrService) {}
 
  showSuccess() {
    this.toastr.success('You've Got It Successfully!');
  }
}

To know more about ngx-toastr NPM module and its API please click on this link.

11. Use Reactive Form to Add Student in Firebase Database using CRUD Services

Go to src > app > app.module.ts file and add the given below code within app.module.ts file to activate Reactive Forms service in your Angular project.

import { ReactiveFormsModule } from '@angular/forms';  // Reactive Form Module

@NgModule({
  imports: [
    ReactiveFormsModule   // Reactive forms module
  ]
})

Afterwards, go to src > app > add-student.component.html file and add the following code. It contains Reactive Forms tags and form validation logic and HTML layout for add student component.

<div class="pt-3 pb-2 mb-3 border-bottom">
  <h1 class="h2">Add Student</h1>
  <p class="custom-text">A demo CRUD app for <strong>student record management system</strong> built with <strong>Angular6 and Firebase5</strong></p>
</div>

<!-- Student form -->
<form [formGroup]="studentForm" (ngSubmit)="submitStudentData()" novalidate> // Declared formGroup="studentForm" to create Reactive form group, novalidate is used to disable HTML5 default validation 
  <div class="row">
    <div class="col-lg-5 col-md-12 col-sm-12">
      <div class="row">
        <div class="col-md-12 mb-3">
          <label>First name</label>
          <input type="text" formControlName="firstName" class="form-control" required>   // formControlName is used to commnunicate to formGroup's properties
          <p *ngIf="firstName.touched && firstName.invalid" class="error"><sup>*</sup>Please enter atleast first name</p>   // Accessing fromGoup object's property using Getter method
          <p *ngIf="firstName.errors?.minlength" class="error"><sup>*</sup>Name shouldn't be less than 2 words</p>         // Accessing Reactive Forms error property using Getter method
        </div>
        <div class="col-md-12 mb-3">
          <label>Last name</label>
          <input type="text" formControlName="lastName" class="form-control">
        </div>
      </div>
      <div class="row">
        <div class="col-md-12 mb-3">
          <label>Email</label>
          <input type="email" formControlName="email" class="form-control" required>
          <p *ngIf="email.touched && email.invalid" class="error"><sup>*</sup>Please provide email</p>
          <p *ngIf="email.errors?.pattern" class="error"><sup>*</sup>Please enter correct email</p>
        </div>
        <div class="col-md-12 mb-3">
          <label>Mobile number</label>
          <input type="text" formControlName="mobileNumber" class="form-control" required>
          <p *ngIf="mobileNumber.touched && mobileNumber.invalid" class="error"><sup>*</sup>Please provide contact
            number</p>
          <p *ngIf="mobileNumber.errors?.pattern" class="error"><sup>*</sup>Use numbers only
            number</p>
        </div>
      </div>
      <div class="form-group text-right">
        <button type="button" class="btn btn-secondary gap-right" (click)="ResetForm()">Reset</button>  // (click) event to trigger ResetForm
        <button type="submit" class="btn btn-success" [disabled]="!studentForm.valid">Add Student</button>   // Disable student form unless it is valid
      </div>
    </div>
  </div>
</form><!-- Student form ends-->

Afterwards, go to src > app > add-student.component.ts file and add the given below code. It contains Reactive Forms Logic, Getter method to access FormGroup’s properties, Reactive Form validation logic, Form Reset method and Toastr service for showing alert messages.

import { Component, OnInit } from '@angular/core';
import { CrudService } from '../shared/crud.service';    // CRUD services API
import { FormBuilder, FormGroup, FormControl, Validators } from '@angular/forms'; // Reactive form services
import { ToastrService } from 'ngx-toastr'; // Alert message using NGX toastr


@Component({
  selector: 'app-add-student',
  templateUrl: './add-student.component.html',
  styleUrls: ['./add-student.component.css']
})

export class AddStudentComponent implements OnInit {
  public studentForm: FormGroup;  // Define FormGroup to student's form
 
  constructor(
    public crudApi: CrudService,  // CRUD API services
    public fb: FormBuilder,       // Form Builder service for Reactive forms
    public toastr: ToastrService  // Toastr service for alert message
  ) { }

 
  ngOnInit() {
    this.crudApi.GetStudentsList();  // Call GetStudentsList() before main form is being called
    this.studenForm();              // Call student form when component is ready
  }

  // Reactive student form
  studenForm() {
    this.studentForm = this.fb.group({
      firstName: ['', [Validators.required, Validators.minLength(2)]],
      lastName: [''],
      email: ['', [Validators.required, Validators.pattern('^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+

12. Set up and Usage of NGX Pagination Module

Run below command in Angular CLI to install NGX Pagination NPM module.

npm install ngx-pagination --save

Open src > app > app.module.ts file and add the given below code.

// NGX Pagination
import { NgxPaginationModule } from 'ngx-pagination';

@NgModule({
    imports: [
          NgxPaginationModule  // Include it in imports array
     ] 
})

How to use NGX Pagination?

// your.component.ts example
import {Component} from '@angular/core';
 
@Component({
    selector: 'my-component',
    template: `
    <ul>
      <li *ngFor="let item of collection | paginate: { itemsPerPage: 07, currentPage: p }"> ... </li>
    </ul>
               
    <pagination-controls (pageChange)="p = $event"></pagination-controls>
    `
})
export class MyComponent {
    p: number = 1;
    collection: any[] = someArrayOfThings;  
}

To learn more about ngx-pagination and its API please visit Pagination for Angular (v2+)

13. Show Students List and Delete Student Object using CRUD API

I am going to fetch students data list using crud.service.ts, afterwards, I’ll be creating
student delete functionality and integrate NGX pagination to show pagination in student’s data list.

Go to src > app > students-list > student-list.component.html file then add the following
code.

<div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
  <h1 class="h2">Students List</h1>
  <!-- It won't show if there is no student data -->
  <a routerLink="/register-student" class="btn btn-success" *ngIf="hideWhenNoStudent">
    <i class="fas fa-plus custom-fa-plus"></i>
    Add Student
  </a>
</div>

<div class="pricing-header mx-auto">

  <!-- Preloader shows before the data loads-->
  <div class="no-data text-center" *ngIf="preLoader">
    <img src="assets/preloader.gif" class="preloader-icon" alt="No student">
  </div>

  <!-- No data shows when their is no student data available -->
  <div class="no-data text-center" *ngIf="noData">
    <img src="assets/no-student.svg" class="nodata-msg" alt="No student">
    <p class="nodata-msg">No student added yet!</p>
    <a routerLink="/register-student" class="btn btn-success">
      <i class="fas fa-plus custom-fa-plus"></i>
      Add Student
    </a>
  </div>

  <!-- Showing students data -->
  <div class="table-responsive" *ngIf="hideWhenNoStudent">
    <table class="table table-bordered table-responsive-sm table-responsive-md table-responsive-lg">
      <thead>
        <tr>
          <th scope="col">Student Id</th>
          <th scope="col">Student name</th>
          <th scope="col">Email</th>
          <th scope="col">Mobile number</th>
          <th class="text-center" scope="col">Edit</th>
        </tr>
      </thead>
      <tbody>
        <!-- *ngFor loop iterates over Student array and fetch the student's data -->
        <!-- paginate pipe will add pagination in student's list, it won't show if items are less then 7 -->
        <tr *ngFor="let student of Student| paginate: { itemsPerPage: 7, currentPage: p }; let i = index;">
          <th scope="row">{{student.$key}}</th>
          <td>{{student.firstName}} {{student.lastName}}</td>
          <td>{{student.email}}</td>
          <td>{{student.mobileNumber}}</td>
          <td class="text-center action-block">
            <!-- routerLink="/edit-student/{{student.$key}}" is refered to { path: 'edit-student/:id', component: EditStudentComponent } in app-routing.moudles.ts -->
            <i class="far fa-edit" routerLink="/edit-student/{{student.$key}}"></i>
            <i class="far fa-trash-alt" (click)="deleteStudent(student)"></i></td>
        </tr>
      </tbody>
    </table>
  </div>
  <!-- Pagination -->
  <pagination-controls (pageChange)="p = $event" autoHide="true" responsive="true"></pagination-controls>
</div>

It’s time to write the logic in src > app > students-list > student-list.component.ts file.

import { Component, OnInit } from '@angular/core';
import { CrudService } from '../shared/crud.service';  // CRUD API service class
import { Student } from './../shared/student';   // Student interface class for Data types.
import { ToastrService } from 'ngx-toastr';      // Alert message using NGX toastr


@Component({
  selector: 'app-students-list',
  templateUrl: './students-list.component.html',
  styleUrls: ['./students-list.component.css']
})

export class StudentsListComponent implements OnInit {
  p: number = 1;                      // Settup up pagination variable
  Student: Student[];                 // Save students data in Student's array.
  hideWhenNoStudent: boolean = false; // Hide students data table when no student.
  noData: boolean = false;            // Showing No Student Message, when no student in database.
  preLoader: boolean = true;          // Showing Preloader to show user data is coming for you from thre server(A tiny UX Shit)
  

  constructor(
    public crudApi: CrudService, // Inject student CRUD services in constructor.
    public toastr: ToastrService // Toastr service for alert message
    ){ }


  ngOnInit() {
    this.dataState(); // Initialize student's list, when component is ready
    let s = this.crudApi.GetStudentsList(); 
    s.snapshotChanges().subscribe(data => { // Using snapshotChanges() method to retrieve list of data along with metadata($key)
      this.Student = [];
      data.forEach(item => {
        let a = item.payload.toJSON(); 
        a['$key'] = item.key;
        this.Student.push(a as Student);
      })
    })
  }

  // Using valueChanges() method to fetch simple list of students data. It updates the state of hideWhenNoStudent, noData & preLoader variables when any changes occurs in student data list in real-time.
  dataState() {     
    this.crudApi.GetStudentsList().valueChanges().subscribe(data => {
      this.preLoader = false;
      if(data.length <= 0){
        this.hideWhenNoStudent = false;
        this.noData = true;
      } else {
        this.hideWhenNoStudent = true;
        this.noData = false;
      }
    })
  }

  // Method to delete student object
  deleteStudent(student) {
    if (window.confirm('Are sure you want to delete this student ?')) { // Asking from user before Deleting student data.
      this.crudApi.DeleteStudent(student.$key) // Using Delete student API to delete student.
      this.toastr.success(student.firstName + ' successfully deleted!'); // Alert message will show up when student successfully deleted.
    }
  }

}

15. Create Edit Student HTML Form and Integrate Edit Student Typescript Logic using Activated Route Service

Go to src > app > edit-student.component.html Create the edit form using HTML and Reactive Form’s attributes then add form validation block within HTML layout.

<div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
   <h1 class="h2">Edit Student Details</h1>
   <div class="btn-toolbar mb-2 mb-md-0">
      <div class="btn-group">
         <!-- goBack() methos to back to previous component -->
         <button class="btn btn-sm btn-outline-secondary" (click)="goBack()">Go Back</button>
      </div>
   </div>
</div>


<div class="row">
   <div class="col-lg-12">
      <div class="pricing-header form-block mx-auto">

         <!-- Student's Edit Form -->
         <form [formGroup]="editForm" (ngSubmit)="updateForm()" novalidate>
            <div class="row">
               <div class="col-lg-5 col-md-12 col-sm-12">
                  <div class="row">
                     <div class="col-md-12 mb-3">
                        <label>First name</label>
                        <input type="text" formControlName="firstName" class="form-control" required>
                        <p *ngIf="firstName.touched && firstName.invalid" class="error">
                            <sup>*</sup>Please enter firstname
                        </p>
                        <p *ngIf="firstName.errors?.minlength" class="error">
                            <sup>*</sup>Name shouldn't be less than 2 words
                        </p>
                     </div>
                     <div class="col-md-12 mb-3">
                        <label>Last name</label>
                        <input type="text" formControlName="lastName" class="form-control">
                     </div>
                  </div>
                  <div class="row">
                     <div class="col-md-12 mb-3">
                        <label>Email</label>
                        <input type="email" formControlName="email" class="form-control" required>
                        <p *ngIf="email.touched && email.invalid" class="error"><sup>*</sup>Please provide email</p>
                        <p *ngIf="email.errors?.pattern" class="error"><sup>*</sup>Please enter correct email</p>
                     </div>
                     <div class="col-md-12 mb-3">
                        <label>Mobile number</label>
                        <input type="text" formControlName="mobileNumber" class="form-control" required>
                        <p *ngIf="mobileNumber.touched && mobileNumber.invalid" class="error">
                           <sup>*</sup>Please provide contact number
                        </p>
                        <p *ngIf="mobileNumber.errors?.pattern" class="error">
                           <sup>*</sup>Use numbers only number
                        </p>
                     </div>
                  </div>
                  <div class="form-group text-right">
                     <button type="submit" class="btn btn-success btn-block" [disabled]="!editForm.valid">
                         Update Student
                     </button>
                  </div>
               </div>
            </div>
         </form>
         <!-- Student's Edit Form ends-->
         
      </div>
   </div>
</div>

Then go to src > app > edit-student.component.ts file and write the edit form logic using Activated Route in the same order as mentioned below.

import {Component, OnInit, AfterViewInit} from '@angular/core';
import {FormGroup,FormBuilder,Validators} from '@angular/forms';
import {CrudService} from '../shared/crud.service';
import {ActivatedRoute,Router} from "@angular/router"; // ActivatedRoue is used to get the current associated components information.
import {Location} from '@angular/common'; // Location service is used to go back to previous component
import {ToastrService} from 'ngx-toastr';

@Component({
   selector: 'app-edit-student',
   templateUrl: './edit-student.component.html',
   styleUrls: ['./edit-student.component.css']
})

export class EditStudentComponent implements OnInit {

   editForm: FormGroup; // Define FormGroup to student's edit form

   constructor(
      private crudApi: CrudService, // Inject CRUD API in constructor
      private fb: FormBuilder, // Inject Form Builder service for Reactive forms
      private location: Location, // Location service to go back to previous component
      private actRoute: ActivatedRoute, // Activated route to get the current component's inforamation
      private router: Router, // Router service to navigate to specific component
      private toastr: ToastrService // Toastr service for alert message
   ) {}

   ngOnInit() {
      this.updateStudentData(); // Call updateStudentData() as soon as the component is ready 
      const id = this.actRoute.snapshot.paramMap.get('id'); // Getting current component's id or information using ActivatedRoute service
      this.crudApi.GetStudent(id).valueChanges().subscribe(data => {
         this.editForm.setValue(data) // Using SetValue() method, It's a ReactiveForm's API to store intial value of reactive form 
      })
   }

   // Accessing form control using getters
   get firstName() {
      return this.editForm.get('firstName');
   }
   get lastName() {
      return this.editForm.get('lastName');
   }
   get email() {
      return this.editForm.get('email');
   }
   get mobileNumber() {
      return this.editForm.get('mobileNumber');
   }

   // Contains Reactive Form logic
   updateStudentData() {
      this.editForm = this.fb.group({
         firstName: ['', [Validators.required, Validators.minLength(2)]],
         lastName: [''],
         email: ['', [Validators.required, Validators.pattern('^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+


)]],
mobileNumber: ['', [Validators.required, Validators.pattern('^[0-9]+

12. Set up and Usage of NGX Pagination Module

Run below command in Angular CLI to install NGX Pagination NPM module.

 

Open src > app > app.module.ts file and add the given below code.

 

How to use NGX Pagination?

 

To learn more about ngx-pagination and its API please visit Pagination for Angular (v2+)

13. Show Students List and Delete Student Object using CRUD API

I am going to fetch students data list using crud.service.ts, afterwards, I’ll be creating
student delete functionality and integrate NGX pagination to show pagination in student’s data list.

Go to src > app > students-list > student-list.component.html file then add the following
code.

 

It’s time to write the logic in src > app > students-list > student-list.component.ts file.

 

15. Create Edit Student HTML Form and Integrate Edit Student Typescript Logic using Activated Route Service

Go to src > app > edit-student.component.html Create the edit form using HTML and Reactive Form’s attributes then add form validation block within HTML layout.

 

Then go to src > app > edit-student.component.ts file and write the edit form logic using Activated Route in the same order as mentioned below.

 

)]] }) } // Accessing form control using getters get firstName() { return this.studentForm.get('firstName'); } get lastName() { return this.studentForm.get('lastName'); } get email() { return this.studentForm.get('email'); } get mobileNumber() { return this.studentForm.get('mobileNumber'); } // Reset student form's values ResetForm() { this.studentForm.reset(); } submitStudentData() { this.crudApi.AddStudent(this.studentForm.value); // Submit student data using CRUD API this.toastr.success(this.studentForm.controls['firstName'].value + ' successfully added!'); // Show success message when data is successfully submited this.ResetForm(); // Reset form when clicked on reset button }; }

12. Set up and Usage of NGX Pagination Module

Run below command in Angular CLI to install NGX Pagination NPM module.

 

Open src > app > app.module.ts file and add the given below code.

 

How to use NGX Pagination?

 

To learn more about ngx-pagination and its API please visit Pagination for Angular (v2+)

13. Show Students List and Delete Student Object using CRUD API

I am going to fetch students data list using crud.service.ts, afterwards, I’ll be creating
student delete functionality and integrate NGX pagination to show pagination in student’s data list.

Go to src > app > students-list > student-list.component.html file then add the following
code.

 

It’s time to write the logic in src > app > students-list > student-list.component.ts file.

 

15. Create Edit Student HTML Form and Integrate Edit Student Typescript Logic using Activated Route Service

Go to src > app > edit-student.component.html Create the edit form using HTML and Reactive Form’s attributes then add form validation block within HTML layout.

 

Then go to src > app > edit-student.component.ts file and write the edit form logic using Activated Route in the same order as mentioned below.

 

)]], mobileNumber: ['', [Validators.required, Validators.pattern('^[0-9]+ )]], mobileNumber: ['', [Validators.required, Validators.pattern('^[0-9]+

12. Set up and Usage of NGX Pagination Module

Run below command in Angular CLI to install NGX Pagination NPM module.

 

Open src > app > app.module.ts file and add the given below code.

 

How to use NGX Pagination?

 

To learn more about ngx-pagination and its API please visit Pagination for Angular (v2+)

13. Show Students List and Delete Student Object using CRUD API

I am going to fetch students data list using crud.service.ts, afterwards, I’ll be creating
student delete functionality and integrate NGX pagination to show pagination in student’s data list.

Go to src > app > students-list > student-list.component.html file then add the following
code.

 

It’s time to write the logic in src > app > students-list > student-list.component.ts file.

 

15. Create Edit Student HTML Form and Integrate Edit Student Typescript Logic using Activated Route Service

Go to src > app > edit-student.component.html Create the edit form using HTML and Reactive Form’s attributes then add form validation block within HTML layout.

 

Then go to src > app > edit-student.component.ts file and write the edit form logic using Activated Route in the same order as mentioned below.

 

)]] }) } // Accessing form control using getters get firstName() { return this.studentForm.get('firstName'); } get lastName() { return this.studentForm.get('lastName'); } get email() { return this.studentForm.get('email'); } get mobileNumber() { return this.studentForm.get('mobileNumber'); } // Reset student form's values ResetForm() { this.studentForm.reset(); } submitStudentData() { this.crudApi.AddStudent(this.studentForm.value); // Submit student data using CRUD API this.toastr.success(this.studentForm.controls['firstName'].value + ' successfully added!'); // Show success message when data is successfully submited this.ResetForm(); // Reset form when clicked on reset button }; }

12. Set up and Usage of NGX Pagination Module

Run below command in Angular CLI to install NGX Pagination NPM module.

 

Open src > app > app.module.ts file and add the given below code.

 

How to use NGX Pagination?

 

To learn more about ngx-pagination and its API please visit Pagination for Angular (v2+)

13. Show Students List and Delete Student Object using CRUD API

I am going to fetch students data list using crud.service.ts, afterwards, I’ll be creating
student delete functionality and integrate NGX pagination to show pagination in student’s data list.

Go to src > app > students-list > student-list.component.html file then add the following
code.

 

It’s time to write the logic in src > app > students-list > student-list.component.ts file.

 

15. Create Edit Student HTML Form and Integrate Edit Student Typescript Logic using Activated Route Service

Go to src > app > edit-student.component.html Create the edit form using HTML and Reactive Form’s attributes then add form validation block within HTML layout.

 

Then go to src > app > edit-student.component.ts file and write the edit form logic using Activated Route in the same order as mentioned below.

 

)]] }) } // Go back to previous component goBack() { this.location.back(); } // Below methods fire when somebody click on submit button updateForm() { this.crudApi.UpdateStudent(this.editForm.value); // Update student data using CRUD API this.toastr.success(this.editForm.controls[‘firstName’].value + ‘ updated successfully’); // Show succes message when data is successfully submited this.router.navigate([‘view-students’]); // Navigate to student’s list page when student data is updated } } )]], mobileNumber: [, [Validators.required, Validators.pattern(‘^[0-9]+

12. Set up and Usage of NGX Pagination Module

Run below command in Angular CLI to install NGX Pagination NPM module.

 

Open src > app > app.module.ts file and add the given below code.

 

How to use NGX Pagination?

 

To learn more about ngx-pagination and its API please visit Pagination for Angular (v2+)

13. Show Students List and Delete Student Object using CRUD API

I am going to fetch students data list using crud.service.ts, afterwards, I’ll be creating
student delete functionality and integrate NGX pagination to show pagination in student’s data list.

Go to src > app > students-list > student-list.component.html file then add the following
code.

 

It’s time to write the logic in src > app > students-list > student-list.component.ts file.

 

15. Create Edit Student HTML Form and Integrate Edit Student Typescript Logic using Activated Route Service

Go to src > app > edit-student.component.html Create the edit form using HTML and Reactive Form’s attributes then add form validation block within HTML layout.

 

Then go to src > app > edit-student.component.ts file and write the edit form logic using Activated Route in the same order as mentioned below.

 

)]] }) } // Accessing form control using getters get firstName() { return this.studentForm.get(‘firstName’); } get lastName() { return this.studentForm.get(‘lastName’); } get email() { return this.studentForm.get(’email’); } get mobileNumber() { return this.studentForm.get(‘mobileNumber’); } // Reset student form’s values ResetForm() { this.studentForm.reset(); } submitStudentData() { this.crudApi.AddStudent(this.studentForm.value); // Submit student data using CRUD API this.toastr.success(this.studentForm.controls[‘firstName’].value + ‘ successfully added!’); // Show success message when data is successfully submited this.ResetForm(); // Reset form when clicked on reset button }; }

12. Set up and Usage of NGX Pagination Module

Run below command in Angular CLI to install NGX Pagination NPM module.

 

Open src > app > app.module.ts file and add the given below code.

 

How to use NGX Pagination?

 

To learn more about ngx-pagination and its API please visit Pagination for Angular (v2+)

13. Show Students List and Delete Student Object using CRUD API

I am going to fetch students data list using crud.service.ts, afterwards, I’ll be creating
student delete functionality and integrate NGX pagination to show pagination in student’s data list.

Go to src > app > students-list > student-list.component.html file then add the following
code.

 

It’s time to write the logic in src > app > students-list > student-list.component.ts file.

 

15. Create Edit Student HTML Form and Integrate Edit Student Typescript Logic using Activated Route Service

Go to src > app > edit-student.component.html Create the edit form using HTML and Reactive Form’s attributes then add form validation block within HTML layout.

 

Then go to src > app > edit-student.component.ts file and write the edit form logic using Activated Route in the same order as mentioned below.

 

Written by Digamber

I am passionate about solving real-world problems through algorithms and functional design. I create digital products that make the user’s life easy using the latest programming languages and frameworks. e.g Angular 2+, Firebase Real-time Database, JavaScript, TypeScript, RxJS, Bootstrap, HTML5, CSS3, WordPress etc...