FileSystemDirectoryEntry: createReader() method
The FileSystemDirectoryEntry
interface's method
createReader()
returns a
FileSystemDirectoryReader
object which can be used to read the entries in
the directory.
Syntax
js
createReader()
Parameters
None.
Return value
A FileSystemDirectoryReader
object which can be used to read the
directory's entries.
Examples
This example creates an async function called readDirectory()
, which fetches all of
the entries in the specified FileSystemDirectoryEntry
and returns them in
an array.
js
async function readDirectory(directory) {
const dirReader = directory.createReader();
const entries = [];
while (true) {
const results = await new Promise((resolve, reject) => {
dirReader.readEntries(resolve, reject);
});
if (!results.length) {
break;
}
for (const entry of results) {
entries.push(entry);
}
}
return entries;
}
This works by calling readEntries()
repetitively to get all the entries in the directory, concatenating each batch to the array. When it returns an empty array, all entries have been read, and the loop ends.
Specifications
Specification |
---|
File and Directory Entries API # dom-filesystemdirectoryentry-createreader |
Browser compatibility
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