Set flash message

I’m using Sprig for some Campaign subscribe/unsubscribe toggles like this:

<button sprig s-method="post" s-action="campaign/forms/unsubscribe" s-val:mailingList="{{ list.slug }}" s-val:email="{{ currentUser.email }}" s-target="#comms">
    Subscribe/Unsubscribe
</button>

Is there a way I can set a flash message when doing it this way? In my other forms I’m doing {{ hiddenInput('successMessage', 'Success.'|hash) }}.

Thanks for your support as always!

[shifuma]

Yep good shout. I’ll keep learning and playing. Thanks for your help @mattstein!

[bencroker]

I second @mattstein’s suggestion of using JavaScript to make this work for your use-case.