How can I downlaod a file with this package?

[JgomesAT]

With dart:html i used this to download a file,

`static void _downloadFile(List bytes, String fileNameWithExtension) {
final html.Blob blob = html.Blob([bytes]);
final String url = html.Url.createObjectUrlFromBlob(blob);
final html.AnchorElement anchor = html.document.createElement('a') as html.AnchorElement
..href = url
..style.display = 'none'
..download = fileNameWithExtension;
html.document.body!.children.add(anchor);

// download
anchor.click();

// cleanup
html.document.body!.children.remove(anchor);
html.Url.revokeObjectUrl(url);

}`
and work fine

now I try to refactor to use the new package web

`static void _downloadFile(List bytes, String fileNameWithExtension) {
final web.Blob blob = web.Blob(bytes.map((int byte) => byte.toJS).toList().toJS);
final String url = web.URL.createObjectURL(blob.toJSBox);
final web.HTMLAnchorElement anchor = web.document.createElement('a') as web.HTMLAnchorElement
..href = url
..style.display = 'none'
..download = fileNameWithExtension;
// Insert new elements in the DOM:
web.document.body!.appendChild(anchor);

// download
anchor.click();

// cleanup
web.document.body!.removeChild(anchor);
web.URL.revokeObjectURL(url);

}`

but it doesn't work

Error: Attempting to box non-Dart object.

[JgomesAT]

I found an option to download, you can avoid the use of blob

`final web.HTMLAnchorElement anchor = web.document.createElement('a') as web.HTMLAnchorElement
..href = "data:application/octet-stream;base64,${base64Encode(bytes)}"
..style.display = 'none'
..download = fileNameWithExtension;

// Insert new elements in the DOM:
web.document.body!.appendChild(anchor);

// download
anchor.click();

// cleanup
web.document.body!.removeChild(anchor);`

[markbreuss]

@JgomesAT saved my ass - thanks a lot!

[AbhiralJain]

@JgomesAT THANK YOU SO MUCH!

[srujzs]

It seems you found a workaround, but I suspect your original issue is here: final String url = web.URL.createObjectURL(blob.toJSBox);. You're boxing a JS object - you shouldn't do that and can just pass it directly without the call to toJSBox.