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.
The non-standard Window
method 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!
Syntax
This method is prefixed with webkit
in all browsers that implement it (that is, Google Chrome).
window.requestFileSystem(type, size, successCallback[, errorCallback]);
Parameters
type
- The type of storage to request. Specify
Window.TEMPORARY
if it's acceptable for the browser to delete the files at its own discretion, such as if storage space runs low, orWindow.PERSISTENT
if 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. size
- The amount of storage space you wish to have allocated for your app's use.
successCallback
- A function which is invoked when the file system has been successfully obtained. The callback receives a single parameter: a
FileSystem
object representing the file system the app has permission to use. errorCallback
Optional- 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
FileError
object describing the error.
Return value
undefined
Example
Specifications
Specification | Status | Comment |
---|---|---|
File and Directory Entries API | Draft | Draft of proposed API |
This API has no official W3C or WHATWG specification.
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
requestFileSystem | Chrome
Full support
13
| Edge
Full support
≤18
| Firefox No support No | IE No support No | Opera No support No | Safari No support No | WebView Android
Full support
37
| Chrome Android
Full support
Yes
| Firefox Android No support No | Opera Android No support No | Safari iOS No support No | Samsung Internet Android
Full support
Yes
|
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- Non-standard. Expect poor cross-browser support.
- Non-standard. Expect poor cross-browser support.
- Requires a vendor prefix or different name for use.
- Requires a vendor prefix or different name for use.