JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
<form id="user_form">
    <input placeholder="username here" type="text" name="ajax-data" id="ajax-data">
    <input type="submit" Value="Submit">
</form>

JavaScript

$(document).ready(function () {
        $("#user_form").submit(function (event) {
            alert("sdfa");

            var textboxvalue = $("#ajax-data").val();
            $.ajax({
                data: {ajaxdata: textboxvalue},
                type: "POST",
                url: 'second.php',
                success: function (result)
                {
                    $(".php_responce_here").html(result);
                }
            });
            return false;
        });
    });