How to use reportProgress in HttpClient in Angular? [duplicate]

Question

I am downloading file using HTTP POST method. I want to call another method to show download progress to end user until file download complete. How to use reportProgress in HttpClient for this.

  downfile(file: any): Observable<any> {      return this.http.post(this.url , app, {       responseType: "blob", reportProgress: true, headers: new HttpHeaders(         { 'Content-Type': 'application/json' },       )     });   } 

Answer 1

You need to use reportProgress: true to show some progress of any HTTP request. If you want to see all events, including the progress of transfers you need to use observe: 'events' option as well and return an Observable of type HttpEvent. Then you can catch all the events(DownloadProgress, Response..etc) in the component method. Find more details in Angular Official Documentation.

  downfile(file: any): Observable<HttpEvent<any>>{      return this.http.post(this.url , app, {       responseType: "blob", reportProgress: true, observe: "events", headers: new HttpHeaders(         { 'Content-Type': 'application/json' },       )     });   } 

Then in component you can catch all the events as below.

this.myService.downfile(file)     .subscribe(event => {          if (event.type === HttpEventType.DownloadProgress) {             console.log("download progress");         }         if (event.type === HttpEventType.Response) {             console.log("donwload completed");         } }); 

Find HttpEventTypes Here.

Answer 2

you will have to add HttpClientModule in your AppModule

you first need to build a request object by creating an instance of HttpRequest class and using reportProgress option.

For more information, please refer: https://alligator.io/angular/httpclient-intro/