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javascript - 以文件上传的形式接收进度

问题描述

我有一些上传文件的代码，我正在寻找一种方法来接收进度百分比，以便将其输入进度条。我尝试了 ProgressEventInit 和 ProgressEvent，但我没有得到我需要的东西。有人有想法么。下面是代码：

function objToQuery(obj: {[key: string]: any}) {
  if (R.isEmpty(obj)) {
    return '';
  }
  return `?${R.toPairs(obj).map(kvPair => kvPair.join('=')).join('&')}`;
}

export default async function request<T>(url: string, options: RequestInit) {
  const response = await window.fetch(url, { credentials: 'include', ...options });
  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
  const json = (await parseJSON<T>(response))!;
  return checkStatus(response, json);
}

export async function postFiles<T>(url: string, postForm: FormData, queryData: {} = {}) {
  const headers: HeadersInit = {
    Accept: 'application/json',
  };

  return request<T>(`${apiRoot}/${url}${objToQuery(queryData)}`, {
    headers,
    method: 'POST',
    body: postForm,
  });
}

标签： javascriptnode.jsreactjstypescript

解决方案

参考：file_upload_demo

注意：由于跨源策略，这可能在片段中不起作用，请在您的机器上尝试。

希望这会有所帮助。 

function postFile() {
    var formdata = new FormData();

    formdata.append('file1', $('#file1')[0].files[0]);

    var request = new XMLHttpRequest();

    request.upload.addEventListener('progress', function (e) {
        var file1Size = $('#file1')[0].files[0].size;

        if (e.loaded <= file1Size) {
            var percent = Math.round(e.loaded / file1Size * 100);
            $('#progress-bar-file1').width(percent + '%').html(percent + '%');
        } 

        if(e.loaded == e.total){
            $('#progress-bar-file1').width(100 + '%').html(100 + '%');
        }
    });   

    request.open('post', '/echo/html/');
    request.timeout = 45000;
    request.send(formdata);
}
.progress-wrapper {
    width:100%;
}
.progress-wrapper .progress {
    background-color:green;
    width:0%;
    padding:5px 0px 5px 0px;
}
<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.js"></script>
</head>
<form id="form1">
    <input id="file1" type="file" />
    <div class="progress-wrapper">
        <div id="progress-bar-file1" class="progress"></div>
    </div>
    <button type="button" onclick="postFile()">Upload File</button>
</form>
</html>

axios是很好的反应解决方案

    upload(files) {
      const config = {
        onUploadProgress: function(progressEvent) {
          var percentCompleted = Math.round((progressEvent.loaded * 100) / progressEvent.total)
          console.log(percentCompleted)
        }
      }
    
      let data = new FormData()
      data.append('file', files[0])
    
      axios.put('/endpoint/url', data, config)
        .then(res => console.log(res))
        .catch(err => console.log(err))
    }

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