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FileSystemDirectoryHandle: resolve() method - Web APIs

Baseline 2023

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The resolve() method of the FileSystemDirectoryHandle interface returns an Array of directory names from the parent handle to the specified child entry, with the name of the child entry as the last array item.

resolve(possibleDescendant)

possibleDescendant

The FileSystemHandle from which to return the relative path.

A Promise which resolves with an Array of strings, or null if possibleDescendant is not a descendant of this FileSystemDirectoryHandle.

No exceptions are thrown.

The following asynchronous function uses resolve() to find the path to a chosen file, relative to a specified directory handle.

async function returnPathDirectories(directoryHandle) {
  // Get a file handle by showing a file picker:
  const [handle] = await self.showOpenFilePicker();
  if (!handle) {
    // User cancelled, or otherwise failed to open a file.
    return;
  }

  // Check if handle exists inside our directory handle
  const relativePaths = await directoryHandle.resolve(handle);

  if (relativePaths === null) {
    // Not inside directory handle
  } else {
    // relativePath is an array of names, giving the relative path
    for (const name of relativePaths) {
      // log each entry
      console.log(name);
    }
  }
}

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