html dialog - example
seems that you hook only into the close event, then look at the favDialog.returnValue to see if its a confirm or a cancel (based on the the button VALUE attributes). ESC also works. Then examine the fields in the form to get their values.
by Andy Bulka
HTML
<!-- Learn about this code on MDN: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog -->
<!-- Simple pop-up dialog box containing a form -->
<dialog id="favDialog">
<form method="dialog">
<p><label>Favorite animal:
<select>
<option></option>
<option>Brine shrimp</option>
<option>Red panda</option>
<option>Spider monkey</option>
</select>
</label></p>
<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
(function() {
var updateButton = document.getElementById('updateDetails');
var favDialog = document.getElementById('favDialog');
var outputBox = document.getElementsByTagName('output')[0];
var selectEl = document.getElementsByTagName('select')[0];
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");
}
});
// "Favorite animal" input sets the value of the submit button
/* selectEl.addEventListener('change', function onSelect(e) {
confirmBtn.value = selectEl.value;
}); */
// "Confirm" button of form triggers "close" on dialog because of [method="dialog"]
favDialog.addEventListener('close', function onClose() {
outputBox.value += favDialog.returnValue + " button clicked! ";
});
})();