JSFiddle - React, Tailwind, and code Playground

HTML

<form action="#" method="post">
    <input type="text" name="abc" value="hi" />
    <input type="submit" name="foo" value="123"/>
    <input type="submit" name="bar" value="456"/>
    <input type="submit" name="bar" value="789"/>
</form>

JavaScript

$('form input:submit').bind('click',function(){
  var $e=$(this);
  $e.parent().append('<input type="text" name="mySubmit" value="'+$e.attr('name')+'" />');
});

$('form').submit(function(e) {
    alert($('form').serialize());
    e.preventDefault();
});