Eric Bidelman - Using the HTML5 Filesystem API
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Copyright 2011 Eric Bidelman
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As we move from an offline world to a completely online world, were demanding more from the Web, and more from web applications. Browser implementers are adding richer APIs by the day to support complex use cases. APIs for things like real-time communication, graphics, and client-side (offline) storage.
One area where the Web has lacked for some time is file I/O. Interacting with binary data and organizing that data into a meaningful hierarchy of folders is something desktop software has been capable of for decades. How amazing would it be if web apps could do the same? The lack of true filesystem access has hindered web applications from moving forward. For example, how can a photo gallery work offline without being able to save images locally? The answer is it cant! We need something more powerful.
The HTML5 File API: Directories and System aims to fill this void. The specification defines a means for web applications to read, create, navigate, and write to a sandboxed section of the users local filesystem. The entirety of the Filesystem API can be broken down into a number of different related specifications:
Reading and manipulating files:
File/Blob,FileList,FileReaderCreating and writing:
BlobBuilder,FileWriterDirectories and filesystem access:
DirectoryReader,FileEntry/DirectoryEntry,LocalFileSystem
The specification defines two versions (asynchronous and synchronous) of the same API. The asynchronous API is useful for normal applications and prevents blocking UI actions. The synchronous API is reserved for use in Web Workers.
HTML5 has several storage options available. The Filesystem API is different in that it aims to satisfy client-side storage use cases not well served by databases such as IndexedDB or WebSQL DB. Generally, these are applications that deal with large binary blobs and share data with applications outside of the context of the browser. The specification lists several use cases worth highlighting:
Persistent uploader
When a file or directory is selected for upload, it copies the files into a local sandbox and uploads a chunk at a time.
Uploads can be restarted after browser crashes, network interruptions, etc.
Video game, music, or other apps with lots of media assets
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