我还在努力想办法解决这个问题。
我可以让用户使用文件输入选择文件(甚至多个):
<form>
<div>
<label>Select file to upload</label>
<input type="file">
</div>
<button type="submit">Convert</button>
</form>
我可以使用<fill in your event handler here>
捕获submit
事件。但是,一旦我这样做了,我如何使用fetch
发送文件呢
fetch('/files', {
method: 'post',
// what goes here? What is the "body" for this? content-type header?
}).then(/* whatever */);
发布于 2016-03-18 18:31:21
这是一个带有注释的基本示例。upload
函数就是您要查找的函数:
// 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);
发布于 2016-11-27 16:05:51
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
})
发布于 2018-03-27 18:49:54
使用Fetch API发送文件时的一个重要注意事项
需要省略Fetch请求的content-type
头。然后,浏览器将自动添加包含Form边界的Content type
标头,如下所示
Content-Type: multipart/form-data; boundary=—-WebKitFormBoundaryfgtsKTYLsT7PNUVD
表单边界是表单数据的分隔符。
https://stackoverflow.com/questions/36067767
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