我如何上传一个文件与JS获取API?

我还在试着接受这件事。

我可以让用户选择文件(甚至多个)与文件输入:

<form>
  <div>
    <label>Select file to upload</label>
    <input type="file">
  </div>
  <button type="submit">Convert</button>
</form>

我可以用<填充事件处理程序>来捕获提交事件。但是一旦我这样做了，我如何使用fetch发送文件?

fetch('/files', {
  method: 'post',
  // what goes here? What is the "body" for this? content-type header?
}).then(/* whatever */);

当前回答

从Alex Montoya的多文件输入元素方法出发

const inputFiles = document.querySelectorAll('input[type="file"]');
const formData = new FormData();

for (const file of inputFiles) {
    formData.append(file.name, file.files[0]);
}

fetch(url, {
    method: 'POST',
    body: formData })

2018-10-25 19:44:09

其他回答

这是一个带有注释的基本示例。上传功能就是你要找的:

// Select your input type file and store it in a variable
const input = document.getElementById('fileinput');

// This will upload the file after having read it
const upload = (file) => {
  fetch('http://www.example.net', { // Your POST endpoint
    method: 'POST',
    headers: {
      // Content-Type may need to be completely **omitted**
      // or you may need something
      "Content-Type": "You will perhaps need to define a content-type here"
    },
    body: file // This is your file object
  }).then(
    response => response.json() // if the response is a JSON object
  ).then(
    success => console.log(success) // Handle the success response object
  ).catch(
    error => console.log(error) // Handle the error response object
  );
};

// Event handler executed when a file is selected
const onSelectFile = () => upload(input.files[0]);

// Add a listener on your input
// It will be triggered when a file will be selected
input.addEventListener('change', onSelectFile, false);

2016-03-18 10:31:20

我是这样做的:

var input = document.querySelector('input[type="file"]')

var data = new FormData()
data.append('file', input.files[0])
data.append('user', 'hubot')

fetch('/avatars', {
  method: 'POST',
  body: data
})

2016-11-27 08:05:51

从Alex Montoya的多文件输入元素方法出发

const inputFiles = document.querySelectorAll('input[type="file"]');
const formData = new FormData();

for (const file of inputFiles) {
    formData.append(file.name, file.files[0]);
}

fetch(url, {
    method: 'POST',
    body: formData })

2018-10-25 19:44:09

这是我的代码:

html:

2019-12-13 10:07:45

对我来说，问题是我正在使用response.blob()填充表单数据。显然你不能这样做，至少用react native，所以我最终使用

data.append('fileData', {
  uri : pickerResponse.uri,
  type: pickerResponse.type,
  name: pickerResponse.fileName
 });

Fetch似乎可以识别该格式，并将文件发送到uri指向的位置。

2018-11-03 03:03:57

我如何上传一个文件与JS获取API?

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