FileSystemEntry.isFile - Web APIs 编辑

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The read-only isFile property of the FileSystemEntry interface is true if the entry represents a file (meaning it's a FileSystemFileEntry) and false if it's not.

You can also use isDirectory to determine if the entry is a directory.

You should not assume that any entry which isn't a file is a directory or vice-versa. There are other types of file descriptors on many operating systems. Be sure to use both isDirectory and isFile as needed to ensure that the entry is something you know how to work with.

Syntax

var isFile = FileSystemEntry.isFile;

Value

A Boolean indicating whether or not the FileSystemEntry is a file.

Example

This example shows how this property might be used to determine whether to process the entry as a directory or file. If the entry is neither, an error handler is called with an appropriate message.

if (entry.isDirectory) {
  processSubdirectory(entry);
} else if (entry.isFile) {
  processFile(entry);
} else {
  displayErrorMessage("Unsupported file system entry specified.");
}

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• File and Directory Entries API
• Introduction to the File System API
• FileSystemEntry
• FileSystemEntry.isDirectory
• FileSystemFileEntry