JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <form method="post" action="submit.php">
        Name: <input type="text" id="name" class="form-control" placeholder="Upisi ime">
    </form>
</body>
</html>

JavaScript

$(document).ready(function(){
    $('#name').change(function(){
        $.ajax({
            url: "submit.php",
            type: "post",
            data: 'name='+ $('#name').val()
        });
    });
});