JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<form action="#" method="POST">
  <input type="text" />
  <input type="submit" />
</form>
<span class="res"></span>

JavaScript

$(document).ready(function(){
	$('form.form-class').submit(function(e) {
    e.preventDefault();
    $.ajax({
       type     : "POST",
       url      : 'some.php',
       data     : $(this).serialize(),
       success  : function(msg) {
            $('span.res').html(msg);
        }
   });
 });
});