How phoenix layouts work in phoenix 1.7?

All the functionality, which previously required a separate live.html and app.html template was updated with functionality, which works for both codepaths (mostly flash message handling). So there’s simply no longer a need for those separte layout files.

So basically adding live functionality in root files is out of the question currently, or I am missing something?

Yes. Always has been. The root layout doesn’t include live things, the layout can …

Good details here: Live layouts — Phoenix LiveView v1.2.5

This is exactly what I was looking for, thanks!

Documentation didn’t have the specific code snippet I needed, so here’s how to set a custom layout for a router.ex live_session.

Imagine you have a dashboard layout that you want all dashboard-y liveviews to use.

Create your custom layout template in:

/lib/myapp_web/components/layouts/dashboard.html.heex

scope "/dashboard", EverlyWeb do
  pipe_through [:browser]

  live_session :dashboard,
    on_mount: [{EverlyWeb.UserAuth, :ensure_authenticated}],
    layout: {EverlyWeb.Layouts, :dashboard} do
    live "/leads", LeadLive.Index, :index
    live "/leads/new", LeadLive.Index, :new
    live "/leads/:id/edit", LeadLive.Index, :edit

    live "/leads/:id", LeadLive.Show, :show
    live "/leads/:id/show/edit", LeadLive.Show, :edit
  end
end