Uncaught (in promise) SweetAlert: You can only use SweetAlert AFTER the DOM has loaded! code example

Example: Uncaught (in promise) cancel

swal({
  …
}).then(function(json_data) {
  …
}, function(dismiss) {
  if (dismiss === 'cancel') { // you might also handle 'close' or 'timer' if you used those
    // ignore
  } else {
    throw dismiss;
  }
})