具有数组的多部分/表单数据 [英] Multipart/form-data with arrays

问题描述

我有一个简单的表单：

<form method="post" action="/test">
  <input type="hidden" name="arr[]" value="val1">
  <input type="hidden" name="arr[]" value="val2">
  <input type="hidden" name="arr[]" value="val3">
  <input type="submit" value="Submit">
</form>

使用控制器：

//...
server.post('/test', function(req, res) {
    res.json(req.body);
});
//...

这将返回正常：

{
  arr: [
    "val1",
    "val2",
    "val3"
  ]
}

但是，当我将enctype更改为multipart / formdata

However, when I change the enctype to multipart/formdata

<form method="post" action="/test" enctype="multipart/form-data">
  <input type="hidden" name="arr[]" value="val1">
  <input type="hidden" name="arr[]" value="val2">
  <input type="hidden" name="arr[]" value="val3">
  <input type="submit" value="Submit">
</form>

服务器现在响应：

{
  arr[]: "val3"
}

有什么问题？有没有一些我需要的配置？

What's the issue? Is there some kind of configuration I need?

如果你想知道，我也在发送一个文件，为什么我需要 multipart / form-data 。

In case you're wondering, I'm also sending a file, that why I need the multipart/form-data.

推荐答案

这可能与使用 body-parser （特别是 urlencoded 方法），其中<默认情况下，href =https://github.com/expressjs/body-parser#bodyparserurlencodedoptions =nofollow noreferrer>，适用于媒体类型应用程序/ x-www-form-urlencoded

It's probably related to the use of body-parser (especially the urlencoded method) which, by default, works on requests with the media-type application/x-www-form-urlencoded only.

您的主应用程序模块可能有以下行：

Your main application module probably has some lines like these:

const bodyParser = require('body-parser');
app.use(bodyParser.urlencoded());

我想，您可以添加以下内容以获取类型为 multipart的请求/ form-data 解析：

I suppose, you could just add the following to have requests of type multipart/form-data parsed as well:

app.use(bodyParser.urlencoded({
  type: 'multipart/form-data'
}));

这篇关于具有数组的多部分/表单数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！