JSFiddle - React, Tailwind, and code Playground

HTML

<form class="form-contact-warp form-calc-ship cb-form" action="">
  <input class="form-control" required="" id="textBox" type="text" name="code" size="15"  placeholder="USI-TECH affiliate ID" />
</form>
<div id="response"></div>

JavaScript

$(function(){
	$('#textBox').on('keyup',function(e){
  	$('#response').html('http://www.example.com/'+encodeURI($(this).val()));
  });
});