如何在文件选择器中获取文件名反应? [英] how get get file name in file chooser in react?

问题描述

你能告诉我如何在文件选择器中获取文件名吗?从文件选择器中选择文件后，我试图在输入字段中设置值这是我的代码https://stackblitz.com/edit/react-d4kp1d?file=bulk.js我是这样试的

<输入id="file_input_file"类名=无"类型=文件"参考={输入参考}onChange={(e)=>{console.log('---')console.log(inputRef.current[0].files[0].name)}}/>

它给了我 undefined

解决方案

来自此处的优秀文档和示例，解释了您正在尝试做什么.https://reactjs.org/docs/uncontrolled-components.html#the-file-input-tag

Codepen: https://codepen.io/anon/pen/LaXXJj

React.JS 包含要使用的特定文件 API.

以下示例显示如何创建对 DOM 节点的引用以访问提交处理程序中的文件:

<块引用>

HTML

<块引用>

React.JS

class FileInput extends React.Component {构造函数(道具){超级(道具)；this.handleSubmit = this.handleSubmit.bind(this);this.fileInput = React.createRef();}处理提交(事件){event.preventDefault();警报(`选定的文件 - ${this.fileInput.current.files[0].name}`);}使成为() {返回 (<form onSubmit={this.handleSubmit}><标签>上传文件:<input type="file" ref={this.fileInput}/><br/><button type="submit">提交</button></表单>);}}ReactDOM.render(<文件输入/>,document.getElementById('root'));

<块引用>

警报文件名

alert(`选定的文件 - ${this.fileInput.current.files[0].name}`);

引用:React.JS 文档 |示例

could you please tell me how get get file name in file chooser in react ? I am trying to set value in input field after choosing file from file chooser here is my code https://stackblitz.com/edit/react-d4kp1d?file=bulk.js I tried like this

<input
        id="file_input_file"
        className="none"
        type="file"
        ref={inputRef }
        onChange={(e)=>{
          console.log('---')
          console.log(inputRef.current[0].files[0].name)

        }}
      />

it gives me undefined

解决方案

Good documentation and example taken from here, explaining what you are trying to do. https://reactjs.org/docs/uncontrolled-components.html#the-file-input-tag

Codepen: https://codepen.io/anon/pen/LaXXJj

React.JS contains a specific File API to use.

The following example shows how to create a ref to the DOM node to access file(s) in a submit handler:

HTML

<input type="file" />

React.JS

class FileInput extends React.Component {
  constructor(props) {
    super(props);
    this.handleSubmit = this.handleSubmit.bind(this);
    this.fileInput = React.createRef();
  }
  handleSubmit(event) {
    event.preventDefault();
    alert(
      `Selected file - ${
        this.fileInput.current.files[0].name
      }`
    );
  }

  render() {
    return (
      <form onSubmit={this.handleSubmit}>
        <label>
          Upload file:
          <input type="file" ref={this.fileInput} />
        </label>
        <br />
        <button type="submit">Submit</button>
      </form>
    );
  }
}

ReactDOM.render(
  <FileInput />,
  document.getElementById('root')
);

Alert Filename

alert(`Selected file - ${this.fileInput.current.files[0].name}`);

Cited: React.JS Documentation | Examples

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