<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<!DOCTYPE html>
<html>
<body>
<p>Click on the button to copy the text from the text field. Try to paste the text (e.g. ctrl+v) afterwards in a different window, to see the effect.</p>
<input type="text" value="Hello World" id="myInput">
<button onclick="myFunction()">Copy text</button>
<script>
function myFunction() {
var copyText = document.getElementById("myInput");
copyText.select();
copyText.setSelectionRange(0, 99999)
document.execCommand("copy");
alert("Copied the text: " + copyText.value);
}
</script>
</body>
</html>
