FileSystemDirectoryReader: readEntries() method

The FileSystemDirectoryReader interface's readEntries() method retrieves the directory entries within the directory being read and delivers them in an array to a provided callback function.

The objects in the array are all based upon FileSystemEntry. Generally, they are either FileSystemFileEntry objects, which represent standard files, or FileSystemDirectoryEntry objects, which represent directories.

Syntax

readEntries(successCallback)
readEntries(successCallback, errorCallback)

Parameters

successCallback

A function which is called when the directory's contents have been retrieved. The function receives a single input parameter: an array of file system entry objects, each based on FileSystemEntry. Generally, they are either FileSystemFileEntry objects, which represent standard files, or FileSystemDirectoryEntry objects, which represent directories. If there are no files left, or you've already called readEntries() on this FileSystemDirectoryReader, the array is empty.

errorCallback Optional

A callback function which is called if an error occurs while reading from the directory. It receives one input parameter: a DOMException object describing the error which occurred.

Return value

None (undefined).

Examples

See DataTransferItem.webkitGetAsEntry() for example code that uses this method.

Specifications

Browser compatibility

On Chrome 77, readEntries() will only return the first 100 FileSystemEntry instances. In order to obtain all of the instances, readEntries() must be called multiple times.

See also

• File and Directory Entries API
• FileSystemDirectoryEntry
• FileSystem