FileSystemEntry.getMetadata() - 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This feature is obsolete.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 getMetadata() obtains a Metadata object with information about the file system entry, such as its modification date and time and its size.

Syntax

FileSystemEntry.getMetadata(successCallback[, errorCallback]);

Parameters

successCallback

A function which is called when the copy operation is succesfully completed. Receives a single input parameter: a Metadata object with information about the file.

errorCallback Optional

An optional callback which is executed if an error occurs while looking up the metadata. There's a single parameter: a FileError describing what went wrong.

Return value

undefined.

Errors

FileError.NOT_FOUND_ERR

The FileSystemEntry refers to an item which doesn't exist.

FileError.SECURITY_ERR

Security restrictions prohibit obtaining the requested metadata.

Example

This example checks the size of a log file in a temporary folder and, if it exceeds a megabyte, moves it into a different directory.

workingDirectory.getFile("tmp/log.txt", {}, function(fileEntry) {
  fileEntry.getMetadata(function(metadata) {
    if (metadata.size > 1048576) {
      workingDirectory.getDirectory("log", {}, function(dirEntry) {
        fileEntry.moveTo(dirEntry);
      }, handleError);
    }
  });
}, handleError);

Browser compatibility

BCD tables only load in the browser

See also

• File and Directory Entries API
• Introduction to the File System API