The Editor's Draft of the FileAPI --
http://dev.w3.org/2006/webapi/FileAPI/ -- has had some updates. These
are the notable changes:
1. Blob.slice behavior has changed to more closely match
String.prototype.slice from ECMAScript (and Array.prototype.slice
semantically). I think we're the first host object to have a slice
outside of ECMAScript primitives; some builds of browsers have already
vendor-prefixed slice till it becomes more stable (and till the new
behavior becomes more diffuse on the web -- Blob will soon be used in
the Canvas API, etc.). I'm optimistic this will happen soon enough.
Thanks to all the browser projects that helped initiate the change --
the consistency is desirable.
2. The read methods on FileReader raise a new exception --
OperationNotAllowedException -- if multiple concurrent reads are
invoked. I talked this over with Jonas; we think that rather than reuse
DOMException error codes (like INVALID_STATE_ERR), these kinds of
scenarios should throw a distinct exception. Some things on the web (as
in life) are simply not allowed. It may be useful to reuse this
exception in other places.
3. FileReader.abort( ) behavior has changed.
4. There is a closer integration with event loops as defined by HTML.
For browser projects with open bug databases, I'll log some bugs based
on test cases I've run on each implementation. A few discrepancies
exist in implementations I've tested; for instance, setting
FileReader.result to the empty string vs. setting it to null, and when
exceptions are thrown vs. use of the error event.
Feedback encouraged! Draft at http://dev.w3.org/2006/webapi/FileAPI/
-- A*
