FileSystemEntry: getParent() method
The FileSystemEntry
interface's method
getParent()
obtains a
FileSystemDirectoryEntry
.
Syntax
getParent(successCallback, errorCallback)
getParent(successCallback)
Parameters
successCallback
-
A function which is called when the parent directory entry has been retrieved. The callback receives a single input parameter: a
FileSystemDirectoryEntry
object representing the parent directory. The parent of the root directory is considered to be the root directory, itself, so be sure to watch for that. errorCallback
Optional-
An optional callback which is executed if an error occurs. There's a single parameter: a
DOMException
describing what went wrong.
Return value
None (undefined
).
Exceptions
FileError.INVALID_STATE_ERR
-
The operation failed because the file system's state doesn't permit it. This can happen, for example, if the file system's cached state differs from the actual state of the file system.
FileError.NOT_FOUND_ERR
-
The specified path could not be found.
FileError.SECURITY_ERR
-
Security restrictions prohibit obtaining the parent directory's information.
Examples
This example renames the file specified by the variable fileEntry
to
"newname.html"
.
fileEntry.getParent(
(parent) => {
fileEntry.moveTo(parent, "newname.html", (updatedEntry) => {
console.log(`File ${fileEntry.name} renamed to newname.html.`);
});
},
(error) => {
console.error(
`An error occurred: Unable to rename ${fileEntry.name} to newname.html.`,
);
},
);
This is accomplished by first obtaining a FileSystemDirectoryEntry
object representing the directory the file is currently located in. Then
moveTo()
is used to rename the file within that
directory.
Using promises
Currently, there isn't a Promise
-based version of this method. You can,
however, create a simple helper function to adapt it, like this:
function getParentPromise(entry) {
return new Promise((resolve, reject) => {
entry.getParent(resolve, reject);
});
}
A similar approach can be taken elsewhere in the File and Directory Entries API.
Specifications
Specification |
---|
File and Directory Entries API # dom-filesystementry-getparent |
Browser compatibility
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