Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
Summary
The IDBMutableFile interface provides access in read or write mode to a file, dealing with all the necessary locks.
Note: This interface used to be called FileHandle , but it was changed to this (bug 1006485.)
As IDBMutableFile objects are bound to a fake file system built on top of IndexedDB, such an object is created using the IDBDatabase.createMutableFile method.
Properties
MutableFile.nameRead only- The name of the handled file.
MutableFile.typeRead only- The MIME type of the handled file.
Events Handler
MutableFile.onabort- The
abortevent is triggered each time the handled file is aborted. MutableFile.onerror- The
errorevent is triggered each time something goes wrong.
Methods
MutableFile.open()- Returns a
LockedFileobject to read or write the associated file safely. MutableFile.getFile()- Returns a
DOMRequestobject. In case of success, the request's result is aFileobject representing a snapshot of the handled file.
Specifications
Not part of any specification at present.