将文件夹参数添加到Rails简单表单上传

<%= form_tag(upload_path, multipart: true) do %>
  <%= file_field_tag 'files[]', multiple: true, webkitdirectory: true, style: 'display: none;' %>
  <%= hidden_field_tag 'folder_path', '', id: 'folder-path' %>
  <%= submit_tag 'Upload' %>
<% end %>

document.querySelector('input[type="file"]').addEventListener('change', function(e) {
  var files = e.target.files;
  var folderPath = files[0].webkitRelativePath.split('/')[0];
  document.getElementById('folder-path').value = folderPath;
});

def upload
  folder_path = params[:folder_path]
  files = params[:files]

  # 处理上传的文件
  # ...

  redirect_to root_path, notice: '文件上传成功！'
end