JSFiddle - React, Tailwind, and code Playground

HTML

<form id="form">

  <input type="text" name="vb" value="">
  <input type="text" name="vd" value="">

  <button type="submit">
    ok
  </button>

</form>

JavaScript

var form = document.getElementById('form');
form.addEventListener('submit', function(e) {
  e.preventDefault();

  var href = 'index.php?aaa' + form.vb.value + 'ccc' + form.vd.value;
  alert(href);
  document.location.href = href;
});