[Feature Request] Specify which folders in ToC are expanded by default

[michjnich]

Allow ToC to expand sections by default

Say I have a posts structure as follows:

Posts
-- Tech
-- -- 2022
-- -- 2021
-- -- 2020
-- Personal
-- -- 2022

At the moment, when I go into posts I will see Tech and Personal at the top level. I would also like to see the expanded view of Tech though, and possibly even the expanded view of the most recent year (2022).

Describe alternatives you've considered

The solution I was considering was to add a parameter to the _index.md file for these folders to set expand. The default would be false (as is) and would only change if explicitly set.

So, eg.

---
title: Technology
menu:
  sidebar:
    name: Tech
    identifier: tech
    expand: true
    weight: 1000
---

If this is set then the section is expanded by default when the page is created.

Additional context

N/A

[hossainemruz]

The menu structure does not accept any custom parameter. So, we can't have the expand field there.

[michjnich]

That's a shame. Not sure where else something like that could go?

Perhaps a single expandedPosts could be set in config,toml that could be either a menu or a post tag, and everything down to that would expand automatically? That would get most of the way there, even if it's not quite as flexible as being able to set true/false individually.

[hossainemruz]

Yes. That's probably will be the way to go.

[hossainemruz]

It seems that Menu can take a map in Params field. We should be able to use that to add expand logic.

Ref: https://github.com/gohugoio/hugo/blob/b80853de90b10171155b8f3fde47d64ec7bfa0dd/navigation/menu.go#L48