30秒学会 React 片段 – TextArea

Renders a <textarea> element that uses a callback function to pass its value to the parent component.

• Use object destructuring to set defaults for certain attributes of the <textarea> element.
• Render a <textarea> element with the appropriate attributes and use the callback function in the onChange event to pass the value of the textarea to the parent.

代码实现

function TextArea({
  callback,
  cols = 20,
  rows = 2,
  disabled = false,
  readOnly = false,
  placeholder = ''
}) {
  return (
    <textarea
      cols={cols}
      rows={rows}
      disabled={disabled}
      readOnly={readOnly}
      placeholder={placeholder}
      onChange={({ target: { value } }) => callback(value)}
    />
  );
}

使用样例

ReactDOM.render(
  <TextArea placeholder="Insert some text here..." callback={val => console.log(val)} />,
  document.getElementById('root')
);