erb javascript 9 lines · 2 tabs

Turbo Streams: update document title with a custom action

Henry Kim Jan 2026

2 tabs

<turbo-stream action="set_title">
  <template><%= "Inbox (#{@unread_count})" %></template>
</turbo-stream>

import { Turbo } from "@hotwired/turbo-rails"

Turbo.StreamActions.set_title = function () {
  const title = this.templateContent.textContent.trim()
  if (title.length > 0) document.title = title
}

2 files · erb, javascript Explain with highlit

Sometimes the DOM updates but the browser tab title stays stale (e.g., unread count, active chat room). A neat Hotwire trick is a custom Turbo Stream action that sets document.title. The server emits a <turbo-stream action='set_title'> with a template containing the new title string. On the client, register Turbo.StreamActions.set_title and set document.title accordingly. This keeps the title logic server-side (easy to format, localize, include counts) and avoids sprinkling JS in controllers. I use it sparingly, but it’s very nice for inbox-style apps where the title communicates context. It also pairs well with Turbo Streams that update the visible header on the page.

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