This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
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.
requestFileSystem() method is a Google Chrome-specific
method which lets a web site or app gain access to a sandboxed file system for its own
use. The returned
FileSystem is then available for use with the other file system APIs.
Even compared to the rest of the File and Directory Entries API,
requestFileSystem() is especially non-standard; only Chrome implements
it, and all other browser makers have decided that they will not implement it. It has
even been removed from the proposed
specification. Do not use this method!
This method is prefixed with
webkit in all browsers that implement it
(that is, Google Chrome).
window.requestFileSystem(type, size, successCallback[, errorCallback]);
- The type of storage to request. Specify
Window.TEMPORARYif it's acceptable for the browser to delete the files at its own discretion, such as if storage space runs low, or
Window.PERSISTENTif you need the files to remain in place unless the user or the web site or app explicitly permit it. Persistent storage requires that the user grant the site quota.
- The amount of storage space you wish to have allocated for your app's use.
- A function which is invoked when the file system has been successfully obtained. The
callback receives a single parameter: a
FileSystemobject representing the file system the app has permission to use.
- An optional parameter specifying a function which is called if an error occurs while
attempting to obtain the file system, or if the user denies permission to create or
access the file system. The callback receives as input a single parameter: a
FileErrorobject describing the error.
No specification found
No specification data found for
Check for problems with this page or contribute a missing
spec_url to mdn/browser-compat-data. Also make sure the specification is included in w3c/browser-specs.
This API has no official W3C or WHATWG specification.
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