JSFiddle - React, Tailwind, and code Playground

HTML

<select>
  <option value="*">Please choose one</option>
    <option value="gradle">gradle</option>
          <option value="ivy">ivy</option>
          <option value="maven">maven</option>
          </select>

JavaScript

var d = document;
var val = str = "";
var s = d.getElementsByTagName("select")[0];
s.onchange = function() {
  val = s.options[s.selectedIndex].value;
  if (val == "") {
    return;
  }
	else
	{
   str = "Hello " + val;
   copyText(str);
	} 
};

function copyText( text ) {
  var textArea = d.createElement("textarea");
  
	d.body.appendChild( textArea );
  
	textArea.textContent = text;
  
	textArea.select();
	
  d.execCommand("copy"); // copy exists on Windows XP
  
	textArea.remove();
}