JSFiddle - React, Tailwind, and code Playground

HTML

<h2>Here's my form:</h2>

<form action='nothing' method='post' name='testform'>
<input type='hidden' name='data' value='blahdatayadda' />
<input type='submit' name='name1' value='value1' />
<input type='submit' name='name2' value='value2' />
</form>

JavaScript

$(document).ready(function(){
  $('form[name="testform"]').submit( function(event){ process_form_submission(event); } );
});

function process_form_submission( event ) {
  event.preventDefault();
  //var target = $(event.target);
  var me = event.currentTarget;
  var data = me.data.value;
  var which_button = '?';       // <-- this is what I want to know
  alert( 'data: ' + data + ', button: ' + which_button );
}