JSFiddle - React, Tailwind, and code Playground

HTML

<form>Email:
    <input type="text" name="email">
    <br>
        </label><input type ="hidden" name="retype-email">
    <br>
    
    <input id="promo-code" type="hidden" name="PromoCode" value="" method="post">
     
        <input class="Orange_button" type="submit" value="Start my free trial" data-code="trial"/> 
        <input class="green_button" type="submit" value="Buy it now" data-code="buy"/> 
        
        
    
</form>

JavaScript

$('form').on('submit', function(e){
    $('[name="retype-email"]').val($('[name="email"]').val());
    var value = $("input[type=submit][clicked=true]").data("code");
    $("#promo-code").val(value);
    alert(value);
    e.preventDefault()
});

$("form input[type=submit]").click(function() {
    $("input[type=submit]", $(this).parents("form")).removeAttr("clicked");
    $(this).attr("clicked", "true");
});