window.onload = function() {

  buttons = document.getElementsByClassName('copy')

  function mycopy(button) {

    alert(button)

    data = button.dataset.clipboardCopy

    while(data == undefined) {

          button = button.parentElement

          data = button.dataset.clipboardCopy

    }

    alert(data)

    i = document.createElement('input')

    i.type = 'text'

    i.value = data

    i.display = 'none'

    button.appendChild(i)

    i.select()

    i.setSelectionRange(0, 99999); /* For mobile devices */

    document.execCommand("copy")

    button.removeChild(i)

  }

  for(i=0;i<buttons.length;i++) {

    buttons[i].addEventListener('click', function(e) {

      mycopy(e.target)

    })

  }

}