Make the download window appear automatically when downloading a file

How can I use JavaScript/TypeScript to prompt the browser to open the download window? My goal is to give users the ability to rename the file and select the download folder, as most downloads are saved directly in the default location.

This is how I currently enable the download:

    const json = JSON.stringify(data);
    const blob = new Blob([json], {type: 'application/json'});
    const url = URL.createObjectURL(blob);

    const a = document.getElementById('export');
    a.download = 'export.json';
    a.href = url;
javascripttypescript

Answer №1

For more details, check out the complete blog post: Download File in Angular Js2 Application

You might be missing these two lines in your code:

var url= window.URL.createObjectURL(b);//add this line 
window.open(url);//add this line for download

I recommend trying it like this:

  constructor(private http:Http)
  {}

  DownloadFile():void
  {
    this.getFile("http://localhost:1800/api/demo/GetTestFile")
    .subscribe(fileData => 
      {
      let b:any = new Blob([fileData], { type: 'application/zip' });
      var url= window.URL.createObjectURL(b);//add this line 
        window.open(url);//add this line for download 
      }
    );
  }

  public getFile(path: string):Observable<any>{
    let options = new RequestOptions({responseType: ResponseContentType.Blob});
    return this.http.get(path, options)
        .map((response: Response) => <Blob>response.blob())  ;
  }

You can find a similar solution provided by me here: Angular JS empty pdf in new window

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