Angular 6 Registration and Login System Example Tutorial

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Angular 6 Registration and Login System Example Tutorial From Scratch

There are the Following The simple About Angular 6 Registration and Login System Example Tutorial From Scratch Full Information With Example and source code.

As I will cover this Post with live Working example to develop Angular 6 Login and Logout with Web API Using Token Based, so the some major files and Directory structures for this example is following below.

Angular 6 Example

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Step 1: Angular 6 Tutorial Project Structure

Angular 6 Alert Component Template

Folder and File Path: /src/app/_directives/alert.component.html

Angular 6 Registration and Login System Example

<div>{{message.text}}</div>

Step 2: Angular 6 Alert Component

Folder and File Path: /src/app/_directives/alert.component.ts

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

import { AlertService } from '../_services';

@Component({
    selector: 'alert',
    templateUrl: 'alert.component.html'
})

export class AlertComponent implements OnInit, OnDestroy {
    private subscription: Subscription;
    message: any;

    constructor(private alertService: AlertService) { }

    ngOnInit() {
        this.subscription = this.alertService.getMessage().subscribe(message => { 
            this.message = message; 
        });
    }

    ngOnDestroy() {
        this.subscription.unsubscribe();
    }
}

Step 3: Angular 6 Auth Guard

Folder and File Path: /src/app/_guards/auth.guard.ts

import { Injectable } from '@angular/core';
import { Router, CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
//Angular 6 Registration and Login System Example Tutorial From Scratch
@Injectable()
export class AuthGuard implements CanActivate {

    constructor(private router: Router) { }

    canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
        if (localStorage.getItem('currentMember')) {
            return true;
        }

        this.router.navigate(['/login'], { queryParams: { returnUrl: state.url }});
        return false;
    }
}

Step 4: Angular 6 Fake Backend Provider

Folder and File Path: /src/app/_helpers/fake-backend.ts

//Angular 6 Registration and Login System Example
import { Injectable } from '@angular/core';
import { HttpRequest, HttpResponse, HttpHandler, HttpEvent, HttpInterceptor, HTTP_INTERCEPTORS } from '@angular/common/http';
import { Observable, of, throwError } from 'rxjs';
import { delay, mergeMap, materialize, dematerialize } from 'rxjs/operators';

@Injectable()
export class FakeBackendInterceptor implements HttpInterceptor {

    constructor() { }

    intercept(req: HttpRequest, next: HttpHandler): Observable<HttpEvent> {
        let members: any[] = JSON.parse(localStorage.getItem('members')) || [];

        return of(null).pipe(mergeMap(() => {

            if (req.url.endsWith('/members/authenticate') && req.method === 'POST') {
                let filteredMembers = members.filter(member => {
                    return member.membername === req.body.membername && member.password === req.body.password;
                });

                if (filteredMembers.length) {
                    let member = filteredMembers[0];
                    let body = {
                        id: member.id,
                        membername: member.membername,
                        memberFname: member.memberFname,
                        memberLname: member.memberLname,
                        token: 'fake-jwt-token'
                    };

                    return of(new HttpResponse({ status: 200, body: body }));
                } else {
                    return throwError({ error: { message: 'Membername or password is incorrect' } });
                }
            }

            if (req.url.endsWith('/members') && req.method === 'GET') {
                if (req.headers.get('Authorization') === 'Bearer fake-jwt-token') {
                    return of(new HttpResponse({ status: 200, body: members }));
                } else {
                    return throwError({ status: 401, error: { message: 'Unauthorised' } });
                }
            }

            if (req.url.match(/\/members\/\d+$/) && req.method === 'GET') {
                if (req.headers.get('Authorization') === 'Bearer fake-jwt-token') {
                    let urlParts = req.url.split('/');
                    let id = parseInt(urlParts[urlParts.length - 1]);
                    let matchedMembers = members.filter(member => { return member.id === id; });
                    let member = matchedMembers.length ? matchedMembers[0] : null;

                    return of(new HttpResponse({ status: 200, body: member }));
                } else {
                    return throwError({ status: 401, error: { message: 'Unauthorised' } });
                }
            }

            if (req.url.endsWith('/members/signup') && req.method === 'POST') {
                let newMember = req.body;

                let duplicateMember = members.filter(member => { return member.membername === newMember.membername; }).length;
                if (duplicateMember) {
                    return throwError({ error: { message: 'Membername "' + newMember.membername + '" is already taken' } });
                }

                newMember.id = members.length + 1;
                members.push(newMember);
                localStorage.setItem('members', JSON.stringify(members));

                return of(new HttpResponse({ status: 200 }));
            }

            // delete member
            if (req.url.match(/\/members\/\d+$/) && req.method === 'DELETE') {
                if (req.headers.get('Authorization') === 'Bearer fake-jwt-token') {
                    let urlParts = req.url.split('/');
                    let id = parseInt(urlParts[urlParts.length - 1]);
                    for (let i = 0; i < members.length; i++) {
                        let member = members[i];
                        if (member.id === id) {
                            members.splice(i, 1);
                            localStorage.setItem('members', JSON.stringify(members));
                            break;
                        }
                    }
                    return of(new HttpResponse({ status: 200 }));
                } else {
                    return throwError({ status: 401, error: { message: 'Unauthorised' } });
                }
            }
            return next.handle(req);
            
        }))
        .pipe(materialize())
        .pipe(delay(500))
        .pipe(dematerialize());
    }
}

export let fakeBackendProvider = {
    // use fake backend in place of Http service for backend-less development
    provide: HTTP_INTERCEPTORS,
    useClass: FakeBackendInterceptor,
    multi: true
};

Step 5: Angular 6 Http Error Interceptor

Folder and File Path: /src/app/_helpers/error.interceptor.ts

import { Injectable } from '@angular/core';
import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { catchError } from 'rxjs/operators';
//Angular 6 Registration and Login System Example
import { AuthenticationService } from '../_services';

@Injectable()
export class ErrorInterceptor implements HttpInterceptor {
    constructor(private authenticationService: AuthenticationService) {}

    intercept(req: HttpRequest, next: HttpHandler): Observable<HttpEvent> {
        return next.handle(req).pipe(catchError(err => {
            if (err.status === 401) {
                this.authenticationService.logout();
                location.reload(true);
            }
            
            const error = err.error.message || err.statusText;
            return throwError(error);
        }))
    }
}

Step 6: Angular 6 JWT Interceptor

Folder and File Path: /src/app/_helpers/jwt.interceptor.ts

import { Injectable } from '@angular/core';
import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable()
export class JwtInterceptor implements HttpInterceptor {
    intercept(req: HttpRequest, next: HttpHandler): Observable<HttpEvent> {
        let currentMember = JSON.parse(localStorage.getItem('currentMember'));
        if (currentMember && currentMember.token) {
            req = req.clone({
                setHeaders: { 
                    Authorization: `Bearer ${currentMember.token}`
                }
            });
        }

        return next.handle(req);
    }
}

Step 7: Angular 6 Member Model

Folder and File Path: /src/app/_models/member.ts

export class Member {
    id: number;
    membername: string;
    password: string;
    memberFname: string;
    memberLname: string;
}

Step 8: Angular 6 Alert Service

Folder and File Path: /src/app/_services/alert.service.ts

import { Injectable } from '@angular/core';
import { Router, NavigationStart } from '@angular/router';
import { Observable, Subject } from 'rxjs';

@Injectable()
export class AlertService {
    private subject = new Subject();
    private keepAfterNavigationChange = false;

    constructor(private router: Router) {
        router.events.subscribe(event => {
            if (event instanceof NavigationStart) {
                if (this.keepAfterNavigationChange) {
                    this.keepAfterNavigationChange = false;
                } else {
                    this.subject.next();
                }
            }
        });
    }

    success(message: string, keepAfterNavigationChange = false) {
        this.keepAfterNavigationChange = keepAfterNavigationChange;
        this.subject.next({ type: 'success', text: message });
    }

    error(message: string, keepAfterNavigationChange = false) {
        this.keepAfterNavigationChange = keepAfterNavigationChange;
        this.subject.next({ type: 'error', text: message });
    }

    getMessage(): Observable {
        return this.subject.asObservable();
    }
}

Step 9: Angular 6 Authentication Service

Folder and File Path: /src/app/_services/authentication.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { map } from 'rxjs/operators';

@Injectable()
export class AuthenticationService {
    constructor(private http: HttpClient) { }

    login(membername: string, password: string) {
        return this.http.post(`${config.apiUrl}/members/authenticate`, { membername: membername, password: password })
            .pipe(map(member => {
                if (member && member.token) {
                    localStorage.setItem('currentMember', JSON.stringify(member));
                }

                return member;
            }));
    }

    logout() {
        localStorage.removeItem('currentMember');
    }
}

Step 10: Angular 6 Member Service

Folder and File Path: /src/app/_services/member.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

import { Member } from '../_models';

@Injectable()
export class MemberService {
    constructor(private http: HttpClient) { }

    getAll() {
        return this.http.get(`${config.apiUrl}/members`);
    }

    getById(id: number) {
        return this.http.get(`${config.apiUrl}/members/` + id);
    }

    signup(member: Member) {
        return this.http.post(`${config.apiUrl}/members/signup`, member);
    }

    update(member: Member) {
        return this.http.put(`${config.apiUrl}/members/` + member.id, member);
    }

    delete(id: number) {
        return this.http.delete(`${config.apiUrl}/members/` + id);
    }
}

Step 11: Angular 6 Home Component Template

Folder and File Path: /src/app/home/home.component.html

<h1>Hi {{currentMember.memberFname}}!</h1>
<p>You're logged in with Angular 6!!</p>
<h3>All signuped members:</h3>
<ul>
    <li>
        {{member.membername}} ({{member.memberFname}} {{member.memberLname}})
        - <a class="text-danger">Delete</a>
    </li>
</ul>
<p><a>Logout</a></p>

Step 12: Angular 6 Home Component

Folder and File Path: /src/app/home/home.component.ts

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

import { Member } from '../_models';
import { MemberService } from '../_services';

@Component({templateUrl: 'home.component.html'})
export class HomeComponent implements OnInit {
    currentMember: Member;
    members: Member[] = [];

    constructor(private memberService: MemberService) {
        this.currentMember = JSON.parse(localStorage.getItem('currentMember'));
    }

    ngOnInit() {
        this.loadAllMembers();
    }

    deleteMember(id: number) {
        this.memberService.delete(id).pipe(first()).subscribe(() => { 
            this.loadAllMembers() 
        });
    }

    private loadAllMembers() {
        this.memberService.getAll().pipe(first()).subscribe(members => { 
            this.members = members; 
        });
    }
}

Step 13: Angular 6 Login Component Template

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Folder and File Path: /src/app/login/login.component.html

<h2>Login</h2>
<h3>Angular 6 Registration and Login System Example Tutorial From Scratch</h3>
<form>
    <div class="form-group">
        <label for="membername">Membername</label>
        
        <div class="invalid-feedback">
            <div>Membername is required</div>
        </div>
    </div>
    <div class="form-group">
        <label for="password">Password</label>
        
        <div class="invalid-feedback">
            <div>Member Password is required</div>
        </div>
    </div>
    <div class="form-group">
        <button class="btn btn-primary">Login</button>
        <img src="image/gif;base64,R0lGODlhEAAQAPIAAP..........." />
        <a class="btn btn-link">SignUp</a>
    </div>
</form>

Step 14: Angular 6 Login Component

Folder and File Path: /src/app/login/login.component.ts

import { Component, OnInit } from '@angular/core';
import { Router, ActivatedRoute } from '@angular/router';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { first } from 'rxjs/operators';

import { AlertService, AuthenticationService } from '../_services';

@Component({templateUrl: 'login.component.html'})
export class LoginComponent implements OnInit {
    loginForm: FormGroup;
    loading = false;
    submitted = false;
    returnUrl: string;

    constructor(
        private formBuilder: FormBuilder,
        private route: ActivatedRoute,
        private router: Router,
        private authenticationService: AuthenticationService,
        private alertService: AlertService) {}

    ngOnInit() {
        this.loginForm = this.formBuilder.group({
            membername: ['', Validators.required],
            password: ['', Validators.required]
        });

        this.authenticationService.logout();

        this.returnUrl = this.route.snapshot.queryParams['returnUrl'] || '/';
    }

    get f() { return this.loginForm.controls; }

    onSubmit() {
        this.submitted = true;

        if (this.loginForm.invalid) {
            return;
        }

        this.loading = true;
        this.authenticationService.login(this.f.membername.value, this.f.password.value)
            .pipe(first())
            .subscribe(
                data => {
                    this.router.navigate([this.returnUrl]);
                },
                error => {
                    this.alertService.error(error);
                    this.loading = false;
                });
    }
}

Step 15: Angular 6 SignUp Component Template

Folder and File Path: /src/app/signup/signup.component.html

<h2>SignUp</h2>
<h3>Angular 6 Registration and Login System Example Tutorial From Scratch</h3>
<form>
    <div class="form-group">
        <label for="memberFname">First Name</label>
        
        <div class="invalid-feedback">
            <div>First Name is required</div>
        </div>
    </div>
    <div class="form-group">
        <label for="memberLname">Last Name</label>
        
        <div class="invalid-feedback">
            <div>Last Name is required</div>
        </div>
    </div>
    <div class="form-group">
        <label for="membername">Membername</label>
        
        <div class="invalid-feedback">
            <div>Membername is required</div>
        </div>
    </div>
    <div class="form-group">
        <label for="password">Password</label>
        
        <div class="invalid-feedback">
            <div>Password is required</div>
            <div>Password must be at least 6 characters</div>
        </div>
    </div>
    <div class="form-group">
        <button class="btn btn-primary">SignUp</button>
        <img src="image/gif;base64,R0lGODlhEAAQAPIAA...." />
        <a class="btn btn-link">Cancel</a>
    </div>
</form>

Step 16: Angular 6 SignUp Component

Folder and File Path: /src/app/signup/signup.component.ts

import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { first } from 'rxjs/operators';

import { AlertService, MemberService } from '../_services';

@Component({templateUrl: 'signup.component.html'})
export class SignUpComponent implements OnInit {
    signupForm: FormGroup;
    loading = false;
    submitted = false;

    constructor(
        private formBuilder: FormBuilder,
        private router: Router,
        private memberService: MemberService,
        private alertService: AlertService) { }

    ngOnInit() {
        this.signupForm = this.formBuilder.group({
            memberFname: ['', Validators.required],
            memberLname: ['', Validators.required],
            membername: ['', Validators.required],
            password: ['', [Validators.required, Validators.minLength(6)]]
        });
    }
    get f() { return this.signupForm.controls; }

    onSubmit() {
        this.submitted = true;
        if (this.signupForm.invalid) {
            return;
        }

        this.loading = true;
        this.memberService.signup(this.signupForm.value)
            .pipe(first())
            .subscribe(
                data => {
                    this.alertService.success('Registration successful', true);
                    this.router.navigate(['/login']);
                },
                error => {
                    this.alertService.error(error);
                    this.loading = false;
                });
    }
}

Step 17: Angular 6 App Component Template

Folder and File Path: /src/app/app.component.html

<div class="jumbotron">
    <div class="container">
        <div class="row">
            <div class="col-sm-6 offset-sm-3">
                
                
            </div>
        </div>
    </div>
</div>

Step 18: Angular 6 App Component

Folder and File Path: /src/app/app.component.ts

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

@Component({
    selector: 'app',
    templateUrl: 'app.component.html'
})

export class AppComponent { }

Step 19: Angular 6 App Module

Folder and File Path: /src/app/app.module.ts

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ReactiveFormsModule }    from '@angular/forms';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';

import { fakeBackendProvider } from './_helpers';

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

import { AlertComponent } from './_directives';
import { AuthGuard } from './_guards';
import { JwtInterceptor, ErrorInterceptor } from './_helpers';
import { AlertService, AuthenticationService, MemberService } from './_services';
import { HomeComponent } from './home';
import { LoginComponent } from './login';
import { SignUpComponent } from './signup';

@NgModule({
    imports: [
        BrowserModule,
        ReactiveFormsModule,
        HttpClientModule,
        routing
    ],
    declarations: [
        AppComponent,
        AlertComponent,
        HomeComponent,
        LoginComponent,
        SignUpComponent
    ],
    providers: [
        AuthGuard,
        AlertService,
        AuthenticationService,
        MemberService,
        { provide: HTTP_INTERCEPTORS, useClass: JwtInterceptor, multi: true },
        { provide: HTTP_INTERCEPTORS, useClass: ErrorInterceptor, multi: true },

        fakeBackendProvider
    ],
    bootstrap: [AppComponent]
})

export class AppModule { }

Step 20: Angular 6 App Routing

Folder and File Path: /src/app/app.routing.ts

import { Routes, RouterModule } from '@angular/router';

import { HomeComponent } from './home';
import { LoginComponent } from './login';
import { SignUpComponent } from './signup';
import { AuthGuard } from './_guards';

const appRoutes: Routes = [
    { path: '', component: HomeComponent, canActivate: [AuthGuard] },
    { path: 'login', component: LoginComponent },
    { path: 'signup', component: SignUpComponent },

    // otherwise redirect to home
    { path: '**', redirectTo: '' }
];

export const routing = RouterModule.forRoot(appRoutes);

Step 21: Angular 6 Main Index Html File

Folder and File Path: /src/index.html



    
    <title>Angular 6 Registration and Login System Example Tutorial From Scratch</title>
    
    

    
        a { cursor: pointer }
    


    Loading...
	<b>Angular 6 Registration and Login System Example Tutorial From Scratch</b>

Step 22: Angular 6 Main (Bootstrap) File

Folder and File Path: /src/main.ts

import './polyfills';

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
platformBrowserDynamic().bootstrapModule(AppModule);

Step 23: Angular 6 Polyfills

Folder and File Path: /src/polyfills.ts

import 'core-js/es6/reflect';
import 'core-js/es7/reflect';
import 'zone.js/dist/zone';

Step 24: Angular 6 Custom Typings File

Folder and File Path: /src/typings.d.ts

//// Angular 6 Registration and Login System Example Tutorial From Scratch
declare var config: any;

Step 25: npm package.json

Folder and File Path: /package.json

{
  "name": "angular-6-registration-login-example-webpack",
  "version": "1.0.0",
  "repository": {
    "type": "git",
    "url": "https://github.com/cornflourblue/angular-6-registration-login-example-webpack.git"
  },
  "scripts": {
    "build": "webpack --mode production",
    "start": "webpack-dev-server --mode development --open"
  },
  "license": "MIT",
  "dependencies": {
    "@angular/common": "^6.0.0",
    "@angular/compiler": "^6.0.0",
    "@angular/core": "^6.0.0",
    "@angular/forms": "^6.0.0",
    "@angular/platform-browser": "^6.0.0",
    "@angular/platform-browser-dynamic": "^6.0.0",
    "@angular/router": "^6.0.0",
    "core-js": "^2.5.5",
    "rxjs": "^6.1.0",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@types/node": "^10.0.4",
    "angular2-template-loader": "^0.6.2",
    "html-webpack-plugin": "^3.2.0",
    "raw-loader": "^0.5.1",
    "ts-loader": "^4.3.0",
    "typescript": "^2.8.3",
    "webpack": "4.8.1",
    "webpack-cli": "^2.1.3",
    "webpack-dev-server": "3.1.4"
  }
}

Step 26: TypeScript tsconfig.json

Folder and File Path: /tsconfig.json

{
  "compilerOptions": {
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": [ "es2015", "dom" ],
    "module": "commonjs",
    "moduleResolution": "node",
    "noImplicitAny": true,
    "sourceMap": true,
    "suppressImplicitAnyIndexErrors": true,
    "target": "es5"
  }
}

Step 27: Webpack 4 Config

Folder and File Path: /webpack.config.js

Angular 6 Routing Tutorial with Examples

Angular 6 Registration and Login System Example Tutorial From Scratch

webpack is a static module bundler for modern JavaScript applications

const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: './src/main.ts',
  module: {
    rules: [
      {
        test: /\.ts$/,
        use: ['ts-loader', 'angular2-template-loader'],
        exclude: /node_modules/
      },
      {
        test: /\.(html|css)$/,
        loader: 'raw-loader'
      },
    ]
  },
  resolve: {
    extensions: ['.ts', '.js']
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: './src/index.html',
      filename: 'index.html',
      inject: 'body'
    }),
    new webpack.DefinePlugin({
      config: JSON.stringify({
        apiUrl: 'http://localhost:4000'
      })
    })
  ],
  optimization: {
    splitChunks: {
      chunks: 'all',
    },
    runtimeChunk: true
  },
  devServer: {
    historyApiFallback: true
  }
};

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