FileSystemEntry.toURL() - Web APIs 编辑

Obsolete

This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The FileSystemEntry interface's method toURL() 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 src and href attributes.

Syntax

FileSystemEntry.toURL([mimeType]);

Parameters

mimeType Optional

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.

Return value

A 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 toURL()).

Example

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 "filesystem:http://my-awesome-website.woot/temporary/awesomesauce.jpg".

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:

<img src="filesystem:http://my-awesome-website.woot/temporary/awesomesauce.jpg">

Browser compatibility

BCD tables only load in the browser

See also

• File and Directory Entries API
• Introduction to the File System API
• FileSystemDirectoryEntry.removeRecursively()