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FileSystemEntry: getMetadata() method

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

Non-standard: This feature is not standardized. We do not recommend using non-standard features in production, as they have limited browser support, and may change or be removed. However, they can be a suitable alternative in specific cases where no standard option exists.

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

getMetadata(successCallback)
getMetadata(successCallback, errorCallback)

Parameters

successCallback: A function which is called when the copy operation is successfully 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 DOMException describing what went wrong.

Return value

None (undefined).

Exceptions

DOMException.NOT_FOUND_ERR: The FileSystemEntry refers to an item which doesn't exist.
DOMException.SECURITY_ERR: Security restrictions prohibit obtaining the requested metadata.

Examples

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",
  {},
  (fileEntry) => {
    fileEntry.getMetadata((metadata) => {
      if (metadata.size > 1048576) {
        workingDirectory.getDirectory(
          "log",
          {},
          (dirEntry) => {
            fileEntry.moveTo(dirEntry);
          },
          handleError,
        );
      }
    });
  },
  handleError,
);

Browser compatibility

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	WebView on iOS
`getMetadata`	8	79	No	15	No	18	No	14	No	1.0	4.4	No