Newsletter signup block

The Threadline Newsletter Signup block embeds a single-field (email) signup form for one list.

Adding it

1. Edit a page or post, add a block, and search for Threadline Newsletter Signup.
2. In the block's sidebar panel (Newsletter List):
   • Choose a list — pick from a dropdown of your lists.
   • Button label — defaults to "Subscribe"; change it to whatever you want the submit button to say.
3. Publish or preview the page.

How it renders

Unlike the Forms block, there's no schema to fetch — it's always the same shape (one email field, a submit button). The rendered markup is a form with an email input and your chosen button label, plus hidden success/error message elements the frontend script shows as needed.

What happens on submit

Signing up through this block goes through the same public subscribe flow as any other public signup — meaning it follows double opt-in: the visitor lands as PENDING and gets a confirmation email, and only becomes SUBSCRIBED after clicking the link in it. The block itself just shows "Check your inbox to confirm your subscription." on successful submission — it doesn't distinguish "confirmation pending" from "already subscribed" in its own messaging.

If the block shows a placeholder message instead of the form

Same two connection-related messages as the Forms block — "Select a list in the block settings." if nothing's picked yet, or the "Threadline is not configured…" message if the plugin isn't connected. See Troubleshooting for connection errors.