Formidable Node模块...如何在文件上载进度开始之前获取非文件字段名称/值

I am using Node's formidable module for form processing. Works perfect. Now I need to have access to the non-file field names/values posted before the file upload starts. The field names/values are available only AFTER the file uploads are done. Is there any way to get the field names before the file uploads start?I am using Node's formidable module for form pr