Copy to Clipboard 2

HTML

<label for="iban">Website:</label>
<input type="text" id="iban" value="pt50 0000 1254 45874 52654 4" />
<button data-copytarget="#iban">copiar</button>

<label for="twitter">Twitter:</label>
<input type="text" id="twitter" value="http://twitter.com/craigbuckler" />
<button data-copytarget="#twitter">copy</button>

CSS

body {
  font-family: sans-serif;
  font-size: 1em;
  color: #333;
  background-color: #ddd;
}

label {
  clear: both;
  display: block;
  font-size: 0.85em;
  font-weight: bold;
  padding: 0.8em 0 0.2em 0;
  user-select: none;
}

input,
button {
  float: left;
  font-size: 1em;
  padding: 3px 6px;
  margin: 0;
  border: 1px solid #333;
  outline: 0;
  box-shadow: none;
}

::-moz-focus-inner {
  padding: 0;
  border: 0;
}

input {
  width: 18em;
  background-color: #fff;
  border-right: 0 none;
}

button {
  position: relative;
  background-color: #aaa;
  cursor: pointer;
}

.copied::after {
  position: absolute;
  top: 0%;
  right: 110%;
  display: block;
  content: "Copied";
  padding: 4px;
  color: #fff;
  background-color: #000;
  border-radius: 3px;
  opacity: 0;
  will-change: opacity, transform;
  animation: showcopied 1.5s;
}

@keyframes showcopied {
  100% {
    opacity: 0;
  }
  70% {
    opacity: 1;
    transform: translateX(0);
  }
  0% {
    opacity: 0;
    transform: translateX(100%);
  }
}

JavaScript

/*
    Copy text from any appropriate field to the clipboard
  By Craig Buckler, @craigbuckler
  use it, abuse it, do whatever you like with it!
*/
(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();

        // copied animation
        t.classList.add('copied');
        setTimeout(function() {
          t.classList.remove('copied');
        }, 1500);
      } catch (err) {
        alert('please press Ctrl/Cmd+C to copy');
      }

    }

  }

})();