This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
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.
FileSystemEntry interface's method
() creates and returns a string containing a URL which can be used to identify the file system entry. This is done by exposing a new URL scheme—
filesystem:—that can be used as the value of
- An optional string specifying the MIME type to use when interpreting the file. This can be used to help deal with files whose types aren't recognized automatically by the user agent. If this parameter is omitted, the user agent uses its standard algorithms to identify the file.
DOMString containing a URL that can then be used as a document reference in HTML content, or an empty string if the URL can't be generated (such as if the file system implementation doesn't support
If you have a
FileSystemFileEntry corresponding to an image file in a file system available to your Web site or app, you can call
toURL() to get its URL for use in HTML. If your site is located at
http://my-awesome-website.woot, and you have a temporary file system that contains an image file named
awesomesauce.jpg, the URL returned by
toURL() might be (depending on the browser's implementation) something like
Code that makes use of this might look like this:
let img = document.createElement("img"); img.src = imageFileEntry.toURL(); document.body.appendChild(img);
Assuming the scenario mentioned before the code, the result would be HTML that looks like this being appended to the end of the document:
|File and Directory Entries API
The definition of 'toURL()' in that specification.
|Editor's Draft||Initial specification.|
This API has no official W3C or WHATWG specification.
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Opera||Safari (WebKit)|
|Basic support||13 webkit||No support||No support||No support||No support|
|Feature||Android||Chrome for Android||Firefox Mobile (Gecko)||IE Phone||Opera Mobile||Safari Mobile|
|Basic support||No support||0.16webkit||No support||No support||No support||No support|
- File and Directory Entries API
- Introduction to the File System API
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.