JSFiddle - React, Tailwind, and code Playground

HTML

<form id="deleteform" action="delete_post.php" method="POST">
    <p>Please confirm you want to delete this post.</p>
    <input type="submit" data-id="100" id="delete_submit" name="delete_submit" value="confirm" />
    <input type="hidden" id="delete_value" value="" />
</form>

JavaScript

$(document).ready(function(){
   $("#deleteform").submit(function(){
      var deleteID = $("#delete_submit").data("id");
      $("#delete_value").val(deleteID);
       return true;
    });
});