30秒学会 React 片段 – useCopyToClipboard

A hook that copies the given text to the clipboard.

• Use the copyToClipboard snippet to copy the text to clipboard.
• Use the React.useState() hook to initialize the copied variable.
• Use the React.useCallback() hook to create a callback for the copyToClipboard method.
• Use the React.useEffect() hook to reset the copied state variable if the text changes.
• Return the copied state variable and the copy callback.

代码实现

const useCopyToClipboard = (text) => {
  const copyToClipboard = (str) => {
    const el = document.createElement('textarea');
    el.value = str;
    el.setAttribute('readonly', '');
    el.style.position = 'absolute';
    el.style.left = '-9999px';
    document.body.appendChild(el);
    const selected =
      document.getSelection().rangeCount > 0
        ? document.getSelection().getRangeAt(0)
        : false;
    el.select();
    const success = document.execCommand('copy');
    document.body.removeChild(el);
    if (selected) {
      document.getSelection().removeAllRanges();
      document.getSelection().addRange(selected);
    }
    return success;
  };

  const [copied, setCopied] = React.useState(false);

  const copy = React.useCallback(() => {
    if (!copied) setCopied(copyToClipboard(text));
  }, [text]);
  React.useEffect(() => () => setCopied(false), [text]);

  return [copied, copy];
};

使用样例

const TextCopy = (props) => {
  const [copied, copy] = useCopyToClipboard('Lorem ipsum');
  return (
    <div>
      <button onClick={copy}>Click to copy</button>
      <span>{copied && 'Copied!'}</span>
    </div>
  );
};

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