Quick gist that converts clicked mailto links to copy-to-clipboard

convertMailto.js

const convertMailto = () => {
  const copyToClipboard = str => {
    const el = document.createElement("textarea");
    el.value = str;
    el.setAttribute("readonly", "");
    el.style.position = "absolute";
    el.style.opacity = "0";
    el.style.pointerEvents = 'none';
    document.body.appendChild(el);

    const selected =
      document.getSelection().rangeCount > 0
        ? document.getSelection().getRangeAt(0)
        : false;

    el.select();
    document.execCommand("copy");
    document.body.removeChild(el);

    if (selected) {
      document.getSelection().removeAllRanges();
      document.getSelection().addRange(selected);
    }
  };

  const emails = Array.from(
    document.querySelectorAll(`a[href^="mailto:"]`)
  );
  emails.forEach(email => {
    email.addEventListener("click", e => {
      e.preventDefault();

      const email = e.target
        .getAttribute("href")
        .split("mailto:")[1]
        .split("?")[0];

      copyToClipboard(email);
    });
  });
};

convertMailto();