使用 reactjs 上传多个文件 [英] Multiple file upload with reactjs

问题描述

我是 reactjs 的新手，我正在尝试上传多个文件.我可以将文件作为 array 存储在 state 组件中.但是当我将数据传递给 axios post 方法时，它给了我作为 [object FileList] 的文件列表.而且我无法遍历这些文件来存储 .甚至我尝试了多种方法来上传多个文件，例如react-Dropzone".但没有帮助.

I'm new to reactjs and I'm trying to upload multiple file upload. I can able to store the files in state component as array . But When I'm passing the data to axios post method, it gives me the list of files as [object FileList] . And I couldn't able to traverse through that files to store . Even I tried multiple methods to upload multiple files like 'react-Dropzone`. But didn't help.

我的反应代码.

handleChange(event) {
  this.setState({ file: event.target.files })
}

async handleSubmit(e) {
  e.preventDefault()
  let res = await this.uploadFile(this.state.file);
}

async uploadFile(File){
  const formData = new FormData();

  formData.append('image', File)
  axios.post(UPLOAD_ENDPOINT, formData, {
    headers: {
      'content-type': 'multipart/form-data'
    }
  }).then(response => {
    console.log(response.data)
  });
}

render() {
  return (
    <form onSubmit={this.handleSubmit}>
      <input type="file" id="file" multiple name="file" onChange={this.handleChange} />
      <button type="submit" className="btn btn-info"> Update File </button>
    </form>
  )
}

推荐答案

The

event.target.files

将为您提供一个文件列表，并将其附加到表单数据中，使用以下代码.

Will give you a file list, and to append it to form data use the following code.

const files = event.target.files;

for (let i = 0; i < files.length; i++) {
    formData.append(`images[${i}]`, files[i])
}

在服务器端，您将从请求对象/变量的 'images' 键中获取所有图像

On the server side you will get all the images from 'images' key of request object/variable

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