{% extends "base.html" %} {% block customscript %} <script type="text/javascript" charset="utf-8"> if (confirm("{message}") == true) { fetch("{{destination}}", { method: "POST", body: JSON.stringify({data}), headers: { "Content-type": "application/json; charset=UTF-8" } }) } else { window.location = "/list" } </script> {% endblock %}