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Created October 25, 2019 22:56
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File Save from (Spartan) Edge PWA
function saveBlob (blob, fileName) {
var a = document.createElement("a");
document.body.appendChild(a); = "display: none";
var url = window.URL.createObjectURL(blob);
a.href = url; = fileName;;
async function SaveAs(blob, fileName) {
// Test if we're running ing the Spartan (Edge) UWP / PWA Context
if (window.Windows) {
var text = await (new Response(blob)).text();
// Create the picker object and set options
var savePicker = new Windows.Storage.Pickers.FileSavePicker();
savePicker.suggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.downloads;
// Dropdown of file types the user can save the file as
savePicker.fileTypeChoices.insert("Plain Text", [".txt"]);
// Default file name if the user does not type one in or select a file to replace
savePicker.suggestedFileName = fileName;
savePicker.pickSaveFileAsync().then(function (file) {
if (file) {
// Prevent updates to the remote version of the file until we finish making changes and call CompleteUpdatesAsync.
// write to file
Windows.Storage.FileIO.writeTextAsync(file, text).then(function () {
// Let Windows know that we're finished changing the file so the other app can update the remote version of the file.
// Completing updates may require Windows to ask for user input.
return Windows.Storage.CachedFileManager.completeUpdatesAsync(file);
}).done(function (updateStatus) {
if (updateStatus === Windows.Storage.Provider.FileUpdateStatus.complete) {
console.log("File " + + " was saved.", "sample", "status");
} else {
console.log("File " + + " couldn't be saved.", "sample", "status");
} else {
console.log("Operation cancelled.", "sample", "status");
} else {
saveBlob(blob, fileName);
function dl() {
var blobObject = new Blob(["I'm completely operational, and all my circuits are functioning perfectly."]);
SaveAs(blobObject, 'test.txt');
<button type="button" onclick="dl()">Click</button>
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