JSFiddle - React, Tailwind, and code Playground

HTML

<form action="register.php" method="post" id="register-form" name="register-form">
    <input type="text" id="username" name="username" placeholder="Username" autofocus="autofocus" required />
    <input type="text" id="password" name="password" placeholder="Password" required />
    <a href="javascript:void(0);" class="btn">Register</a>
    <input type="submit" id="register-form-submit" style="display: none;" />
    </form>

JavaScript

$("#register-form .btn").on('click', function () { $("#register-form-submit").trigger('click'); });