Ant Design Upload get file content

Question

I am using the Ant Design Upload component. Is there a way I can get the content of the selected file as a string in JavaScript in order to display it on the page?

Ideally, I would like to access file.data or something.

<Upload
    accept=".txt, .csv"
    showUploadList={false}
    beforeUpload={(file, fileList) => {
        // Access file content here and do something with it
        console.log(file);

        // Prevent upload
        return false;
    }}
>
    <Button>
        <Icon type="upload" /> Click to Upload
    </Button>
</Upload>

Answer 1

Heavily inspired by this answer from Shreyans Shrivastav but modified to better suit what has been asked. You can use a FileReader to read the content of the file:

<Upload
    accept=".txt, .csv"
    showUploadList={false}
    beforeUpload={file => {
        const reader = new FileReader();

        reader.onload = e => {
            console.log(e.target.result);
        };
        reader.readAsText(file);

        // Prevent upload
        return false;
    }}
>
    <Button>
        <Icon type="upload" /> Click to Upload
    </Button>
</Upload>;

Answer 2

const { Upload, message, Button, Icon, } = antd;

const props = {
  name: 'file',
  action: '//jsonplaceholder.typicode.com/posts/',
  headers: {
    authorization: 'authorization-text',
  },
  onChange(info) {
    if (info.file.status !== 'uploading') {
       let reader = new FileReader();
        reader.onload = (e) => {
           console.log(e.target.result);
        }
        reader.readAsText(info.file.originFileObj);
    }
    if (info.file.status === 'done') {
      message.success(`${info.file.name} file uploaded successfully`);
    } else if (info.file.status === 'error') {
      message.error(`${info.file.name} file upload failed.`);
    }
  },
};

ReactDOM.render(
  <Upload {...props}>
    <Button>
      <Icon type="upload" /> Click to Upload
    </Button>
  </Upload>,
  mountNode
);

Please check CodePen