How to Download Files in Angular2 ?

Downloading Files in Angular2

You are facing difficulties while implementing file downloads using Angular2. Specifically, you are unable to understand how to save the received data and trigger the file save functionality. Let's explore how this can be achieved in Angular.

The Issue

The primary issue in your code is that the observable used for downloading the file runs in a separate context. This leads to an empty object when attempting to create the URL variable using window.URL.createObjectURL. To resolve this issue, we need to ensure that the objectURL is constructed within the correct context.

The Solution

One effective solution to this problem is to subscribe to the observable and pass the data to a separate function that handles the file download. This can be accomplished with the following code:

this._reportService.getReport().subscribe((data) => this.downloadFile(data));

The downloadFile function is defined as follows:

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

In this function, we create a blob object with the response data and specify the file type. Then, we generate the objectURL and open a new window to download the file.

Additional Considerations

It's important to ensure that the 'rxjs/Rx' module is imported correctly. In order to use observable features such as 'subscribe,' you may need to include the following line at the top of your component:

import 'rxjs/Rx';

Conclusion

By subscribing to the observable and passing the data to a dedicated function that creates the objectURL, you can successfully download files in Angular2 and above. This method allows you to have greater control over the download process and handle the data within the correct context.

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