copy to clipboard

new_gist_file.js

(function() {
  'use strict';
  
  // click events
  document.body.addEventListener('click', copy, true);
  
  // event handler
  function copy(e) {
    // find target element
    var
      t = e.target,
      c = t.dataset.copytarget,
      inp = (c ? document.querySelector(c) : null);
      
    // is element selectable?
    if (inp && inp.select) {
      // select text
      inp.select();
      
       try {
        // copy text
        document.execCommand('copy');
        inp.blur();
      }
      catch (err) {
        alert('please press Ctrl/Cmd+C to copy');
      }
    }
  }
})();