@yncoder/element-react/dist/npm/es6/src/upload/ajax.js

Element UI for React

function getError(action, option, xhr) {
  var msg = void 0;
  if (xhr.response) {
    msg = xhr.status + ' ' + (xhr.response.error || xhr.response);
  } else if (xhr.responseText) {
    msg = xhr.status + ' ' + xhr.responseText;
  } else {
    msg = 'fail to post ' + action + ' ' + xhr.status;
  }

  var err = new Error(msg);
  err.status = xhr.status;
  err.method = 'post';
  err.url = action;
  return err;
}

function getBody(xhr) {
  var text = xhr.responseText || xhr.response;
  if (!text) {
    return text;
  }

  try {
    return JSON.parse(text);
  } catch (e) {
    return text;
  }
}

export default function upload(option) {
  if (typeof XMLHttpRequest === 'undefined') {
    return;
  }

  var xhr = new XMLHttpRequest();
  var action = option.action;

  if (xhr.upload) {
    xhr.upload.onprogress = function progress(e) {
      if (e.total > 0) {
        e.percent = e.loaded / e.total * 100;
      }
      option.onProgress(e);
    };
  }

  var formData = new FormData();

  if (option.data) {
    Object.keys(option.data).map(function (key) {
      formData.append(key, option.data[key]);
    });
  }

  formData.append(option.filename, option.file);

  xhr.onerror = function error(e) {
    option.onError(e);
  };

  xhr.onload = function onload() {
    if (xhr.status < 200 || xhr.status >= 300) {
      return option.onError(getError(action, option, xhr));
    }

    option.onSuccess(getBody(xhr));
  };

  xhr.open('post', action, true);

  if (option.withCredentials && 'withCredentials' in xhr) {
    xhr.withCredentials = true;
  }

  var headers = option.headers || {};

  for (var item in headers) {
    if (headers.hasOwnProperty(item) && headers[item] !== null) {
      xhr.setRequestHeader(item, headers[item]);
    }
  }
  xhr.send(formData);
  return xhr;
}