Copy Current Page URL Button

(function () {
  'use strict';

  document.addEventListener('DOMContentLoaded', function () {
    var buttons = document.querySelectorAll('[data-copy-url]');
    if (!buttons.length) { return; }

    function fallbackCopy(text, btn) {
      var ta = document.createElement('textarea');
      ta.value     = text;
      ta.style.cssText = 'position:fixed;top:0;left:0;opacity:0;';
      document.body.appendChild(ta);
      ta.focus();
      ta.select();
      try { document.execCommand('copy'); } catch (err) { /* unsupported */ }
      document.body.removeChild(ta);
      showFeedback(btn);
    }

    function showFeedback(btn) {
      var original = btn.textContent;
      btn.textContent = btn.getAttribute('data-copied-label') || 'Copied!';
      btn.setAttribute('disabled', 'disabled');
      setTimeout(function () {
        btn.textContent = original;
        btn.removeAttribute('disabled');
      }, 2000);
    }

    buttons.forEach(function (btn) {
      btn.addEventListener('click', function (e) {
        e.preventDefault();
        var url = window.location.href;
        if (navigator.clipboard && navigator.clipboard.writeText) {
          navigator.clipboard.writeText(url)
            .then(function ()  { showFeedback(btn); })
            .catch(function () { fallbackCopy(url, btn); });
        } else {
          fallbackCopy(url, btn);
        }
      });
    });
  });
}());