使用 showDirectoryPicker() 访问子目录文件内容

Question

如何使用 File System Access API 访问所选目录的文件夹中包含的文件？

document.querySelector('button').addEventListener('click', async () => {
  const dirHandle = await window.showDirectoryPicker();
  for await (const entry of dirHandle.values()) {
    if (entry.kind === "file"){
      const file = await entry.getFile();
      const text = await file.text();
      console.log(text);
    }
    if (entry.kind === "directory"){
      /* for file in this directory do something */ 
    }
  }
});

<button>Choose Directory</button>

Answer 1

您需要调用 dirHandle.getDirectoryHandle(name, options) 方法，并将 name 参数设置为条目的 .name。

这是一个示例代码，它将遍历传递的目录并构建它找到的文件的树。

btn.onclick = async (evt) => {
  const out = {};
  const dirHandle = await showDirectoryPicker();  
  await handleDirectoryEntry( dirHandle, out );
  console.log( out );
};
async function handleDirectoryEntry( dirHandle, out ) {
  for await (const entry of dirHandle.values()) {
    if (entry.kind === "file"){
      const file = await entry.getFile();
      out[ file.name ] = file;
    }
    if (entry.kind === "directory") {
      const newHandle = await dirHandle.getDirectoryHandle( entry.name, { create: false } );
      const newOut = out[ entry.name ] = {};
      await handleDirectoryEntry( newHandle, newOut );
    }
  }
}

Live demo, edit code.

Answer 2

凯多回答的小改进：

btn.onclick = async (evt) => {
  const out = {};
  const dirHandle = await showDirectoryPicker();  
  await handleDirectoryEntry( dirHandle, out );
  console.log( out );
};
async function handleDirectoryEntry( dirHandle, out ) {
  for await (const entry of dirHandle.values()) {
    if (entry.kind === "file"){
      const file = await entry.getFile();
      out[ file.name ] = file;
    }
    if (entry.kind === "directory") {
      const newOut = out[ entry.name ] = {};
      await handleDirectoryEntry( entry, newOut );
    }
  }
}

dirHandle.values() returns 继承自 FileSystemHandle 的对象列表，有两种可能性：FileSystemFileHandle 或 FileSystemDirectoryHandle.

因为 const entry 已经是 FileSystemDirectoryHandle 如果 entry.kind 是 "directory" 则不需要调用 dirHandle.getDirectoryHandle()

使用 showDirectoryPicker() 访问子目录文件内容

Accessing sub-directory file content using showDirectoryPicker()

html

javascript

file-system-access-api