```javascript
var Copy2Clipboard = {
init: function(selector) {
var btns = document.querySelectorAll(selector);
for (var i = 0, len = btns.length; i < len; i++) {
var btn = btns[i]
btn.addEventListener('click', function(event) {
var btn = event.target
try {
console.debug("click")
var textarea = document.getElementById(btn.getAttribute('data-target'))
if (textarea == null) {
alert("copy-to-clipboard target is undefined")
return
}
textarea.select();
var successful = document.execCommand && document.execCommand('copy')
if (successful) {
btn.innerHTML = 'Copied...'
} else {
alert("Press Ctrl+C or Cmd+C to copy")
}
} catch (err) {
console.log('Oops, unable to copy')
}
})
}
}
}
Copy2Clipboard.init('.copy-to-clipboard')
```
```html