How to Download Files in Angular2 and Above: A Step-by-Step Guide

How to Download a File Using Angular2 or Above

Angular2 introduced significant changes to the way files are downloaded. Understanding how Angular saves files can be a challenge, especially for those accustomed to the practices used in legacy versions.

To download a file in Angular2, follow these steps:

1. Create a function that handles the download request, subscribing to the returned observable.
2. Within the subscribe callback, create a Blob object from the downloaded data.
3. Use the URL.createObjectURL() method to create a URL for the Blob.
4. Open the URL in a new window to initiate the file download.

An example implementation is provided below:

downloadfile(type: string){

  this.pservice.downloadfile(this.rundata.name, type)
      .subscribe(data => this.downloadFile(data),
                  error => console.log("Error downloading the file."),
                  () => console.log('Completed file download.'));
}

downloadFile(data: Response) {
  const blob = new Blob([data], { type: 'application/octet-stream' });
  const url = window.URL.createObjectURL(blob);
  window.open(url);
}

Note:

Ensure you have imported rxjs/Rx to enable the use of observables.

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