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 FileEntrySync interface of the File System API represents a file in a file system. It lets you write content to a file.
Inherits from: EntrySync
About this document
This document was last updated on March 2, 2012 and follows the W3C Specifications (Working Draft) drafted on April 19, 2011.
This specification is more or less abandoned as it didn't get significant traction among browser makers.
Basic concepts
To write content to file, create a FileWriter object by calling createWriter().
Method overview
FileWriterSync createWriter () raises (FileException); |
File file () raises (FileException); |
Methods
createWriter()
Creates a new FileWriter associated with the file that the FileEntry represents.
void createWriter ( ) raises (FileException);
Parameter
None.
Returns
FileWriterSync
Exceptions
This method can raise a FileException with the following codes:
| Exception | Description |
|---|---|
NOT_FOUND_ERR |
The file does not exist. |
INVALID_STATE_ERR |
The file is no longer valid for some reason other than it having been deleted. |
file()
Returns a File that represents the current state of the file that this FileEntry represents.
void file ( ) raises (FileException);
Parameter
None.
Returns
File
Exceptions
This method can raise a FileException with the following codes:
| Exception | Description |
|---|---|
NOT_FOUND_ERR |
The file does not exist. |
INVALID_STATE_ERR |
The file is no longer valid for some reason other than it having been deleted. |
Browser compatibility
| Desktop | Mobile | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | Chrome
Full support
13
| Edge ? | Firefox No support No | IE No support No | Opera No support No | Safari No support No | WebView Android ? | Chrome Android
Full support
18
| Edge Mobile ? | 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
- Compatibility unknown
- Compatibility unknown
- 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.
See also
Specification:File API: Directories and System SpecificationWD
Reference: File System API
Introduction: Basic Concepts About the File System API