Session.hasFlash
Session.hasFlash($key) -> boolean
Description
Return true if the flash $key has been set for the current session via Session.setFlash.
// ... process user action ...
Session.setFlash('message', 'Congratulations!')
// ... in the NEXT request only ...
// In HTML template
--- if (Session.hasFlash('message')) {
<div>{{ Session.getFlash('message') }}</div>
--- }
//= <div>Congratulations!</div>