Recently, I've been working on enhancing my Angular project by incorporating new functionalities such as file upload, download, renaming, or deletion for JSON files. As someone who is still new to typescript and angular, I could really benefit from some expert advice on the most convenient way to achieve this. Could you please point me in the right direction?
Thank you.
If you're looking to download a file, follow these three steps:
1- Send the appropriate request from the Angular side
download(): Observable<HttpResponse<Blob>> {
return this.http.get<HttpResponse<Blob>>(someURL, {
observe: 'response',
responseType: 'blob'
}); as any }
2- In your backend, make sure to set the necessary headers in the response. The following code snippet is for .NET Framework 4.7 and will return CSV file contents:
var contents = new byte[0]; // Insert your file contents here
var response = new HttpResponseMessage(HttpStatusCode.OK) { Content = new
ByteArrayContent(contents)};
response.Content.Headers.ContentDisposition = new
ContentDispositionHeaderValue("attachment")
{
FileName = file.Name
}
response.Content.Headers.Add("Access-Control-Expose-Headers", "Content-
Disposition");
response.Content.Headers.ContentType = new MediaTypeHeaderValue ("text/csv");
return response;
3- Finally, subscribe to the http request on the Angular side:
const result
= this.service.download()
.subscribe(res=> {
let contentDisposition = res.headers.get('content-disposition');
let filename = contentDisposition.split(';')[1].split('filename')
[1].split('=')[1].trim();
let blob = res.body;
const url = window.URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = url;
link.download = fileName;
document.body.appendChild(link);
link.click();
window.URL.revokeObjectURL(url);
link.parentNode.removeChild(link);
});
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