Question

我有一个用户可以提交或不提交文件的表单。

表格：

<form method="post" action="/file/upload" enctype="multipart/form-data">
    <input type="file" name="media" />
    <input type="submit" value="Submit" />
</form>

控制器

module.exports = {
  upload: function (req, res) {
    // Check if any files were uploaded
    if (!req.file('media')._files[0]) {
        return res.send('no file given!');
    }

    req.file('media').upload({
      dirname: '/tmp/uploads'
    },function whenDone(err, uploadedFiles) {
      if (err) {
        sails.log.error('Error uploading file', err);
      }
      res.send('thanks for your file');
    });
  }
};

如果他们没有上传文件，我会收到以下错误消息。除非我进入船长代码并注释掉错误，否则它似乎不是一种捕获它或抑制它的方法。 如何在不附加文件的情况下提交表单而不会导致应用崩溃？

Error: EMAXBUFFER: An Upstream (`NOOP_media`) timed out before it was plugged into a receiver. It was still unused after waiting 4500ms. You can configure this timeout by changing the `maxTimeToBuffer` option.

我已经通过了许多论坛和博客文章，但到目前为止没有任何帮助。

Answer 1

您必须在.upload()内进行检查。删除if语句。

req.file('media').upload({
  dirname: '/tmp/uploads'
}, function whenDone(err, uploadedFiles) {
  if(uploadedFiles.length === 0){ // Check the number of files uploaded.
    return res.send('no file given!');
  }
  if (err) {
    sails.log.error('Error uploading file', err);
  }
  return res.send('thanks for your file');
});

Answer 2

当文件输入为空时，它看起来像普通的文本输入，它将是空的，所以你可以尝试检查这样的事情：

 if(typeof req.param('media') !== 'undefined' && req.param('media').length == 0)) {
        return res.send('no file given!');
   }else {  //handle the file upload }

Answer 3

您可以使用noMoreFiles()中止流。

const skipperUpstream = req.file('media');

// skipperUpstream._files is an internal array containing the uploaded files for key `media`
// here i just expecting a single file, or none
const file = skipperUpstream._files[0];

if (!file) {
  // `skipperUpstream.__proto__` is `Upstream`. It provides `noMoreFiles()` to stop receiving files.
  // It also clears all timeouts: https://npmdoc.github.io/node-npmdoc-skipper/build/apidoc.html#apidoc.element.skipper.Upstream.prototype.noMoreFiles
  skipperUpstream.noMoreFiles();
  return;
}

skipperUpstream.upload(/* your stuff */);

如何使用Sails JS处理可选文件上传？

3 个答案: