To create a download progress bar with a percentage in Angular, you can use the HttpClient module to request a server and track the download's progress. Here is an example of how this can be done,
    First, install the @angular/material and @angular/cdk packages in your Angular project:
    npm install @angular/material @angular/cdk

Import the MatProgressBarModule and MatProgressSpinnerModule modules from the @angular/material package in your Angular module:
import { MatProgressBarModule, MatProgressSpinnerModule } from '@angular/material';

@NgModule({
  imports: [
    MatProgressBarModule,
    MatProgressSpinnerModule
  ],
  // ...
})
export class AppModule { }

Now, import the HttpClient module and the HttpEventType enum from the @angular/common/http package:
import { HttpClient, HttpEventType } from '@angular/common/http';

Inject the HttpClient service into your component or service using the constructor:
constructor(private http: HttpClient) {}

Create a function to make the download request and track the progress:
public percentDone: number = 0;

public downloadFile() {
  this.http.get('https://example.com/file.zip', { responseType: 'blob' })
    .subscribe(event => {
      if (event.type === HttpEventType.DownloadProgress) {
        // Update the progress bar with the download percentage
        const this.percentDone = Math.round(100 * event.loaded / event.total);
        console.log(`Downloaded ${this.percentDone}%`);
      } else if (event.type === HttpEventType.Response) {
        // Save the downloaded file
        const file = new Blob([event.body], { type: 'application/zip' });
        const fileURL = URL.createObjectURL(file);
        window.open(fileURL);
      }
    });
}

In your component's template, use the mat-progress-bar and mat-progress-spinner components to display the progress bar and percentage:
<mat-progress-bar mode="determinate" [value]="percentDone"></mat-progress-bar>
<mat-progress-spinner mode="determinate" [value]="percentDone"></mat-progress-spinner>
<p>{{percentDone}}%</p>

You can use the percentDone property to bind to the value attribute of the mat-progress-bar and mat-progress-spinner components, as well as to display the percentage as text.

This is an example of how you can create a material design download progress bar with a percentage in Angular. You can customize the appearance and behaviour of the progress bar and percentage by using the various options and styles available for the mat-progress-bar and mat-progress-spinner components.

In my previous article Simple Way To Create Sqlite Database, I talked about the choice of the database and I focused on the simplest one which is Sqlite. But even if we choose the right one, we still need to work on the design and on its integration in the application side.

The old way of doing things was to use a database driver in your application, define the connexion and then execute the SQL command and queries from your code. When you get the data from the query execution, you need to parse them and then insert them to your objects. And this was a heavy task.

Later in time appeared Object-Relational Mapping. The ORM.

The ORM is the object-relational Mapping Tool. To make it simple, it's a tool that helps you to translate your database tables to a class Model in your application and vice versa. It also provides you with the methods to perform all the CRUD operation

The approach of creating the database then generating the class model is called Database First. The approach of creating the model in your application and then generating the database is called Code First.

In this article, we will focus on the database first part.

Entity Framework
Entity framework is the most commonly used ORM in .NET projects. It doesn't only allow you to access the database from your application. But also it also simplifies your life by giving you advanced possibilities like managing the concurrency and configuring your model. It has also the advantage of the use of the Language Integrated Query LINQ which is a powerful tool to perform your queries and filters.

Step 1: Nuget packages
    Create a new console project in visual studio.
    Open the commad line: Go to Tools => NuGet Package Manager => Package Manager Console and then you will get the command line displayed in your editor.

Install the required libraries by executing the following commands :

    PM>  Install-Package Microsoft.EntityFrameworkCore.Tools
    PM> install-Package Microsoft.EntityFrameworkCore.Sqlite
    Once you installed all packages you should have the following references in your solution

Step 2: Model generation

    To generate the model, you need to use also the command line
    You need to copy the needed database to your project folder and choose the right mode of copy to output directory:

Now you can generate your classes using the following command. You need to specify the output path, in our case it will be the folder Models
Scaffold-DbContext "Data Source=.\Database\products.db" Microsoft.EntityFrameworkCore.Sqlite -OutputDir Models
if everything is ok, you should get the classes generated under the folder Models and the following message in the package manager console should appear

The warning is there because the generator hardcoded the database's connection string in the code. You need to consider moving it in a protected way to a configuration file. But let's ignore it because it's not the main topic of this article.

Step 3: Check your generated classes
Now you should have the Context that contains the model creation and for each table you will get a class. In our case we have only one entity.

The Context class,
using System;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;
namespace EntityFrameworkDbFirst.Models;
public partial class ProductsContext: DbContext {
    public ProductsContext() {}
    public ProductsContext(DbContextOptions < ProductsContext > options): base(options) {}
    public virtual DbSet < Item > Items {
        get;
        set;
    }
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    #warning To protect potentially sensitive information in your connection string, you should move it out of source code.You can avoid scaffolding the connection string by using the Name = syntax to read it from configuration - see https: //go.microsoft.com/fwlink/?linkid=2131148. For more guidance on storing connection strings, see http://go.microsoft.com/fwlink/?LinkId=723263.
        => optionsBuilder.UseSqlite("Data Source=.\\Database\\products.db");
    protected override void OnModelCreating(ModelBuilder modelBuilder) {
        modelBuilder.Entity < Item > (entity => {
            entity.HasKey(e => e.Barcode);
            entity.Property(e => e.Barcode).HasColumnType("VARCHAR");
            entity.Property(e => e.Brand).HasColumnType("VARCHAR");
            entity.Property(e => e.Name).HasColumnType("VARCHAR");
            entity.Property(e => e.PruchasePrice).HasColumnType("DOUBLE");
            entity.Property(e => e.SellingPrice).HasColumnType("DOUBLE");
        });
        OnModelCreatingPartial(modelBuilder);
    }
    partial void OnModelCreatingPartial(ModelBuilder modelBuilder);
}

The class Item,
using System;
using System.Collections.Generic;
namespace EntityFrameworkDbFirst.Models;
public partial class Item {
    public string Barcode {
        get;
        set;
    } = null!;
    public string ? Name {
        get;
        set;
    }
    public string ? Brand {
        get;
        set;
    }
    public double ? PruchasePrice {
        get;
        set;
    }
    public double ? SellingPrice {
        get;
        set;
    }
}

Step 4: Write your cruds
Once you have created your model, you can now start performing operations on it. The following code in program.cs allows to add / update or delete an item.
You can test it and then see the results in the database directly.

It's a simple call to every method of the crud. You can play with it by changing the data and adding more controls.
For example if you call the AddItem twice without modifying it you will get an exception related to the constraint of the primary key
// See https://aka.ms/new-console-template for more information
using EntityFrameworkDbFirst.Models;
using System.Runtime.CompilerServices;
using static System.Net.Mime.MediaTypeNames;
using System.Xml.Linq;
try {
    Item item = new Item() {
        Barcode = "B12345678",
            Brand = "Milky Way",
            Name = "Milk",
            PruchasePrice = 20.5,
            SellingPrice = 25.5
    };
    // Uncomment this line if you want to test the delete method
    //DeleteItem("B12345678");
    AddItem(item);
    ////Uncomment this line if you want to test the update method
    //item.SellingPrice = 30;
    //UpdateItem(item);
    Console.WriteLine("Everything is Ok !");
} catch (Exception e) {
    Console.WriteLine(e.Message);
    if (e.InnerException != null) Console.WriteLine(e.InnerException.Message);
}
void AddItem(Item item) {
    using(var db = new ProductsContext()) {
        db.Items.Add(item);
        db.SaveChanges();
    }
}
//Delete the item
void DeleteItem(string Barcode) {
    using(var db = new ProductsContext()) {
        var item = db.Items.Find(Barcode);
        if (item == null) return;
        db.Items.Remove(item);
        db.SaveChanges();
    }
}
//Update the price of the item
void UpdateItem(Item item) {
    using(var db = new ProductsContext()) {
        db.Items.Update(item);
        db.SaveChanges();
    }
}

Step 4: And finally check your database
If you remember, we have set the property of the database in the solution explorer to "Copy if newer" so the file products.db is copied to the binary folder.
Open the database and browse your file then you will see the inserted item. Ensure that you left at least one product after testing the add and the delete

Here I recorded a video using MediaRecorder in Angular, So for that follow the below steps for a practical example.

Step 1
Install the @types/dom-mediacapture-record using below npm command
npm i @types/dom-mediacapture-record

No need to import this package into the app.module.ts file, We can directly use in our component.

Step 2
Add the below code to your tsconfig.json file for avoiding some elements-related errors.

tsconfig.json
"compilerOptions": {
    "strictPropertyInitialization": false
  },

If you have already added then avoid it.

Step 3
Now need to import some basic packages from @angular/core and declare the MediaRecorder variable into the component where you want to use it.

Here I am using the app.component.ts file
import {   Component,  ViewChild,  OnInit,  ElementRef} from '@angular/core';
declare var MediaRecorder: any;

Let's share the whole ts file code, Please refer to the below app.component.ts file code

import {Component,  ViewChild,  OnInit,  ElementRef} from '@angular/core';
declare var MediaRecorder: any;
@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.scss']
})
export class AppComponent implements OnInit {
    //Video Record and Play By Peter
    videoElement: HTMLVideoElement;
    recordVideoElement: HTMLVideoElement;
    mediaVideoRecorder: any;
    videoRecordedBlobs: Blob[];
    isRecording: boolean = false;
    downloadVideoUrl: string;
    stream: MediaStream;
    @ViewChild('recordedVideo') recordVideoElementRef: ElementRef;
    @ViewChild('liveVideo') videoElementRef: ElementRef;
    constructor() {}
    async ngOnInit() {
        navigator.mediaDevices.getUserMedia({
            video: {
                width: 480
            }
        }).then(stream => {
            this.videoElement = this.videoElementRef.nativeElement;
            this.recordVideoElement = this.recordVideoElementRef.nativeElement;
            this.stream = stream;
            this.videoElement.srcObject = this.stream;
        });
    }
    startVideoRecording() {
        this.videoRecordedBlobs = [];
        let options: any = {
            mimeType: 'video/webm'
        };
        try {
            this.mediaVideoRecorder = new MediaRecorder(this.stream, options);
        } catch (err) {
            console.log(err);
        }
        this.mediaVideoRecorder.start();
        this.isRecording = !this.isRecording;
        this.onDataAvailableVideoEvent();
        this.onStopVideoRecordingEvent();
    }
    stopVideoRecording() {
        this.mediaVideoRecorder.stop();
        this.isRecording = !this.isRecording;
    }
    playRecording() {
        if (!this.videoRecordedBlobs || !this.videoRecordedBlobs.length) {
            return;
        }
        this.recordVideoElement.play();
    }
    onDataAvailableVideoEvent() {
        try {
            this.mediaVideoRecorder.ondataavailable = (event: any) => {
                if (event.data && event.data.size > 0) {
                    this.videoRecordedBlobs.push(event.data);
                }
            };
        } catch (error) {
            console.log(error);
        }
    }
    onStopVideoRecordingEvent() {
        try {
            this.mediaVideoRecorder.onstop = (event: Event) => {
                const videoBuffer = new Blob(this.videoRecordedBlobs, {
                    type: 'video/webm'
                });
                this.downloadVideoUrl = window.URL.createObjectURL(videoBuffer);
                this.recordVideoElement.src = this.downloadVideoUrl;
            };
        } catch (error) {
            console.log(error);
        }
    }
}Put the same code in your component and verify once it is the correct one.Here I have created some functions regarding our video recording functionality, and If you want to try other mime types then you can use them according to your requirement,Refer to the below support mime types:"video/webm",
"audio/webm",
"video/webm;codecs=vp8",
"video/webm;codecs=daala",
"video/webm;codecs=h264",
"audio/webm;codecs=opus",
"video/mpeg",Step 4Put the HTML code as shown below app.component,html<div style="text-align:center">
  <h1 style="margin-bottom:30px;">Video Record Using Angular by Peter</h1>
  <video class="video" #liveVideo autoplay controls></video>
  <span class="m-1"></span>
  <video class="video" style="width:480px !important;" controls #recordedVideo></video>
  <br>
  <button class="btn btn-success btn-lg" *ngIf="!isRecording" (click)="startVideoRecording()">Start Recording</button>
  <button class="btn btn-warning btn-lg" *ngIf="isRecording" (click)="stopVideoRecording()">Stop Recording</button>
</div>If you want to get a better UI then please add the below script to your main index.html, Here I am sharing the whole index.html code you can use only CSS and js.index.html<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Video Record by RG</title>
  <base href="/">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
    <link rel="stylesheet" href="https://unpkg.com/[email protected]/style.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body>
  <app-root></app-root>
</body>
</html>

Let's save and run the app, Browser asks for your camera access give them.
And then click on Start Recording to start and Stop Recording to stop it. Once your recorder has done your recorded video show on right side.

You can play your recorded video by clicking on the play/pause icon.

This would be a series of articles, in this article, we would talk about out-of-box files code explanation and implement new custom APIs (to be covered in the next article)

It will cover the following things,

    What is NestJS? (covered in the previous article)
    Background (covered in the previous article)
    Installation (covered in the previous article)
    Hands-on Lab – Create a sample NestJS project (covered in the previous article)
    Hands-on Lab – Create custom API in the existing NestJS project (covered in the second article)
    In-depth Explanation - Out-of-the-box files (current article)

In-depth Explanation - Out-of-the-box files

Open Visual Code and see the project structure with the following files,

main.ts

    In the below code, the NestFactory method is imported as an entry point of the application. Next, the AppModule is imported from the previously discussed app. module file.
    Secondly, the bootstrap is marked as async and implemented. The main purpose of importing the bootstrap function is to call it for code execution.
    Then, the execution takes when the NestFactory.create() method is called the AppModule is passed as an argument to the root application module.
    This will attach a module by creating a new NestJS instance.
    The next step is to start the server by using the event listener method on the web server with port 3000.
    This method will return a promise indicating that the server has successfully started embarking on the await key.

app.module.ts

• In the below code snippet, the AppModule is imported as a method, and @Module decorator is imported from @nestjs/ sharing common library. The @Module decorator when passed consists of three properties namely imports, controllers, and providers.
• The specified controllers in the AppModule should always be the part of the array assigned to the property in the initial stage of the application development because the count of the controller is constrained to AppController which is the root module.
• And, the services should be made readily available in AppModule and hence be listed in the array assigned to the property of providers.

app.controller.ts
    The below code snippet is a simple demonstration of a controller in NestJS consisting of only one GET route. The class can be made a controller just by adding the @Controller decorator. It is also imported from the @nestjs/ which is a common library for all.
    The point here is to understand clearly that the controller usually relies on a service class.
    In the examples given AppController uses App service to implement the app.services.ts file by importing the corresponding statement that is added at the top.
    However, the process of inserting AppService into AppController is based on the method of Dependency Injection which by default adds the parameter of the same type.
    A default route is then implemented to handle the HTTP GET request through @Get decorator to implement getHello method.
    The method is therefore powered by AppService to fetch data and carry out request and response actions by returning at the same time.

app.services.ts file

• The below code snippet is a simple demonstration of a controller in NestJS consisting of only one GET route. The class can be made a controller just by adding the @Controller decorator. It is also imported from the @nestjs/ which is a common library for all.
• The point here is to understand clearly that the controller usually relies on a service class. In the examples given AppController uses Appservice to implement the app.services.ts file by importing the corresponding statement that is added at the top.
• However, the process of inserting AppService into AppController is based on the method of Dependency Injection which by default adds the parameter of the same type. A default route is then implemented to handle the HTTP GET request through @Get decorator to implement getHello method. The method is therefore powered by AppService to fetch data and carry out request and response actions by returning at the same time.

In this article, we talked about all the out-of-the-box files in detail and create a few custom APIs
Stay tuned for the next series of articles, hope you see you guys again soon.

Happy learning!

HostForLIFE.eu Node.js Hosting
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We know Angular 15 is released on November 2022, so now in this article, we will see how to create an Angular 15 project. If you have already worked with angular previously you know, angular CLI helps us to build an angular application. Creating a new project in angular is now as simple as installing the Angular CLI and running the ng new command.

What is Angular CLI?
The Angular CLI helps us to create an Angular application and it uses Typescript, it creates an angular application with all the configuration files and the packages in one single command.

It helps us to add features (components, pipe, services, directives, etc.) to existing or new Angular applications.

How to create a new Angular 15 project
To create a new angular 15 project, first we need to set up the system environment

Installing Visual Studio Code
We need an editor to create the application so for that we need to install VS code. It is easy to install and helps us to create an angular application easily. You can download Visual Studio Code from the following link.

Node.Js
Node.js is the open source, cross-platform javascript run time environment.

Go to https://nodejs.org/en/

And install the LTS version
Install the Package Manager

To install Angular and its dependencies, we now need to install Node Package Manager (NPM).

NPM is the node.js package manager for JavaScript, which is automatically installed when we install node.js.

To see the version of NPM, run the below command on the Node.js command prompt like below
Node -v

Go to the Node.js command prompt and install typescript using the below command
Npminstall –gTypescript
Angular CLI (command line interface)

It is a tool that allows us to create a project using the command line argument.

So below is the command to create the latest angular project
npminstall -g @angular/cli@latest

Once the above command runs successfully, now check the latest version of angular and run the below command
Ngversion

Since I was already working on angular 14, so for me only I need to run the Angular CLI command.
Below is the image when my angular version is v14,

Now I ran below CLI command and then check the angular version like the below image
npminstall -g @angular/cli@latest

So this is the way we can upgrade the angular version to the latest version. You can also install the older version of Angular as shown below,

    MDAngular8
    cdAngular8
    npmi @angular/[email protected]

Now to create an Angular 15 application run the below command
NgnewAngular15App

Once you run the above command it will ask to install routing like below, give Y and press enter

After that, it will ask to add CSS like the below,

Once you press enter, it will take a few minutes to create the Angular 15 Application.

So from above, we can see, the angular 15 project creation is in progress.

From the above image, we can see, the angular 15 projects was created successfully. After creating this project, now let's open the VS code, go File tab then select the folder, and go to the directory where we created the angular 15 project, from there, select the angular15 project folder. Once you will load the project, you will see all files in VS code.

Now run the ng serve –o command, it will open the angular15 project like below

If you face an error like below then delete ng.ps1 file
PS C:\Users\DELL\Angular15App> ng serve -o

ng : File C:\Users\DELL\AppData\Roaming\npm\ng.ps1 cannot be loaded. The file C:\Users\DELL\AppData\Roaming\npm\ng.ps1 is not digitally signed.
You cannot run this script on the current system. For more information about running scripts and setting execution policies, see
about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.

Then follow the below points then run ng serve –o again,
    Delete ng.ps1 from the directory C:\Users\% usernam%\AppData\Roaming\npm\
    Try to clear the npm cache directory C:\Users\%usernam%\AppData\ Roaming\npm-cache\

Note - Sometimes without clearing the cache also, the above error is resolved.
Now to verify that this application is created in Angular15, just go to the package.json file and see all the libraries are in v15 like below.

To build the application below is the command
ng build

To run the application below is the command
ng serve

after serving the application, go to the browser and enter the below URL, this is the default URL where the angular application run.
http://localhost:4200/