How To Create A Download Progress Bar With Angular And Material Design

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,

1. First, install the @angular/material and @angular/cdk packages in your Angular project:

   npm install @angular/material @angular/cdk

2. 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 { }
   

3. Now, import the HttpClient module and the HttpEventType enum from the @angular/common/http package:

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

4. Inject the HttpClient service into your component or service using the constructor:

   constructor(private http: HttpClient) {}

5. 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);
         }
       });
   }
   

6. 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>
   

7. 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.