JSFiddle - React, Tailwind, and code Playground

by Richard Hunter

HTML

<!-- Simple pop-up dialog box containing a form -->
<dialog id="favDialog">
  <form method="dialog">
    <input id="input-1"/>
    <menu>
      <button value="cancel">Cancel</button>
      <button id="confirmBtn" value="default">Confirm</button>
    </menu>
  </form>
</dialog>

<menu>
  <button id="updateDetails">Update details</button>
</menu>

<output aria-live="polite"></output>

JavaScript

var updateButton = document.getElementById('updateDetails');
var favDialog = document.getElementById('favDialog');
var outputBox = document.querySelector('output');
var selectEl = document.querySelector('select');
var confirmBtn = document.getElementById('confirmBtn');

// "Update details" button opens the <dialog> modally
updateButton.addEventListener('click', function onOpen() {
  if (typeof favDialog.showModal === "function") {
    favDialog.showModal();
  } else {
    alert("The <dialog> API is not supported by this browser");
  }
});

inputEl = document.getElementById('input-1');
inputEl.addEventListener('input', (event) => {
	confirmBtn.value = { foo : event.target.value };
});
// "Confirm" button of form triggers "close" on dialog because of [method="dialog"]
favDialog.addEventListener('close', function onClose() {
  outputBox.value = favDialog.returnValue + " button clicked - " + (new Date()).toString();
});