JSFiddle - React, Tailwind, and code Playground

HTML

<form id="register-form" action="<?=$_SERVER['PHP_SELF']?>" method="post">
    <label>Name <span style='color: red'>*</span>
        <br/>
        <input type='text' name='user_name' />
    </label>
    <label>Email <span style='color: red'>*</span>
        <br/>
        <input type='text' name='user_email' />
    </label>//Another form elements
    <button name='register' type='submit'>Register</button>
</form>

JavaScript

$('#register-form').submit(function(event){
    event.preventDefault();
    $(this).find(":submit").prop( "disabled", true );
});