How to add progress bar when click upload button?

I work on angular 8 application I need to add progress bar

when click upload button so progress bar will work when click

button upload until finish upload

upload service

public uploadFile = () => {
this._dataService.PostUpload(this.selectedoptions.toString(),this.fileToUpload)

 .subscribe((response: Blob) => saveAs(response, this.fileToUpload.name + '.xlsx'));
}