How to Implement Effortless File Downloads in Your Angular2 Application?

Angular2 File Downloads Made Easy

When developing an Angular2 client for a WebApi or MVC app, understanding file saving can be daunting. This walkthrough will guide you through the process of triggering file saves in Angular2 and beyond.

In Angular2, the observable nature of the request processing introduces a subtle twist. To successfully download a file, you'll need to create the file URL object within the observable's callback function. This ensures that the file data is available when the URL is created.

For example, the following code snippet demonstrates how to handle file downloads:

this._reportService.getReport().subscribe(data => this.downloadFile(data)),//console.log(data),
                 error => console.log('Error downloading the file.'),
                 () => console.info('OK');

Here, our _reportService.getReport() call returns an observable. When the request is complete, the downloadFile function is invoked with the file data.

Within downloadFile, we create a Blob object from the received data and specify its MIME type:

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

With the Blob object created, we can use createObjectURL to generate the downloadable URL. Finally, window.open(url) triggers the file save.

In conclusion, by handling file downloads within the observable's callback function, you can ensure access to the downloaded data at the right time. This enables you to effortlessly provide seamless file downloading functionality in your Angular2 applications.

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