Is it possible for us to download a file to a sandboxed location using File API available in HTML 5?

I wanted to ensure the documents I let user download are programmat开发者_C百科ically manipulated throughout program.

I came to know that File API does give Apps the opportunity to manipulate them. But how can we store the Files in the sandboxed location?

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You cannot directly read or write anything to the file system. You always have to go through either the usual upload/save dialog, or rely on desktop drag-and-drop (you can drag files into most modern browsers, and out of Google Chrome, at least).

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It seems you can't let the browser download the file directly into File API's sandbox now. You have to fetch the file by yourself in JavaScript and write it to a file through File API. If the file is from the same origin, you can just fetch it by XHR.