This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
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
Metadataobject with information about the file. errorCallbackOptional- An optional callback which is executed if an error occurs while looking up the metadata. There's a single parameter: a
FileErrordescribing what went wrong.
Return value
Errors
FileError.NOT_FOUND_ERR- The
FileSystemEntryrefers 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);
Specifications
| Specification | Status | Comment |
|---|---|---|
| File and Directory Entries API The definition of 'getMetadata()' in that specification. |
Editor's Draft | Initial specification. |
This API has no official W3C or WHATWG specification.
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 13 webkit | No support | No support | No support | No support |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | No support | 0.16webkit | No support | No support | No support | No support |