JSFiddle - React, Tailwind, and code Playground

HTML

First Name:<input type="text" id="FirstName" />
Last Name:<input type="text" id="LastName" />

JavaScript

function validate(){

  if ( $('#FirstName').val().length   >   2   || $('#LastName').val().length  >   2  ) {
     after( "<span class='errors'  style='color:red;'> Not a valid email </span> ");
  }
}
    
   
$(document).ready(function (){
$('#FirstName, #LastName').keyup(function() {
   validate();
 });
});