Question: Is it possible using Javascript and Html to open a Save As Dialog from a chrome extension on a Windows OS machine?

I have tried the following without luck:

1. The chrome extension's fileBrowserHandler - It works only on Chrome
OS
2. HTML5 input with type= file - It opens the Open dialog but not save
3. Anchor tag with download attribute (Save) - It downloads the file directly
to the browser's download setting. If the browser's setting Ask
Where to save the file is set, it opens the Save dialog. Is there a
way to force the browser setting programatically from the chrome
extension?

Please let me know if there are any other ways to get around this.
Any help would be appreciated.
Thanks!

Answer: 
To force the Save Dialog from a chrome extension, use chrome extension's download api and set the saveAs options flag to true. Something like this:

```
chrome.downloads.download({
    url: window.location.href + '/' + fileName,
    filename: fileName,
    saveAs: true
}, function (downloadId) {
    console.log(downloadId);
});

```
Try using the [FileSaver](http://purl.eligrey.com/github/FileSaver.js/) HTML5 polyfill. It allows you to save anything to a file from JavaScript:

```js
var blob = new Blob(["Hello, world!"], {type: "text/plain;charset=utf-8"});
saveAs(blob, "hello world.txt");

```