File Save from (Spartan) Edge PWA

fileSaveSpartanPWA.htm

<script>
function saveBlob (blob, fileName) {
    var a = document.createElement("a");
    document.body.appendChild(a);
    a.style = "display: none";
        var url = window.URL.createObjectURL(blob);
        a.href = url;
        a.download = fileName;
        a.click();
        window.URL.revokeObjectURL(url);
};

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.
                Windows.Storage.CachedFileManager.deferUpdates(file);
                // 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 " + file.name + " was saved.", "sample", "status");
                    } else {
                        console.log("File " + file.name + " 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');
}
</script>

<button type="button" onclick="dl()">Click</button>