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Navigation: add a home link that always points to home_url() #30975

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@gwwar gwwar commented Apr 19, 2021

Fixes #20542 Alternative to #30926

This PR adds a new navigation link variations that renders a link, backed by home_url(). While editing, this is auto-updated for a user. Note that it's entirely possible for this url value to get out of sync with what home_url(). Two simple examples are:

  1. We save a page with the navigation block. We update home_url(). The page is never saved again by the user.
  2. Someone modifies the url attribute in code view, classic editor, or in a hook.

Regardless of how someone may alter block attributes, the render_callback will ignore the url attribute in favor of home_url(). Updating this value in the editor is mainly to give the user a good experience for knowing where home_url currently points to.

Areas that might need a bit of iteration is the new argument on LinkControl to avoid allowing users to edit a url.

homevariation.mp4

Testing Instructions

Depending on what version of WP we're using, variations provided to the NavigationLink are either defined in a fallback JS variations file, or in the server block registration.

No custom variations 5.7.1 and below Master with custom variations
Screen Shot 2021-04-19 at 11 40 03 AM Screen Shot 2021-04-19 at 11 45 48 AM

WP 5.7.1 and below

  • Checkout this branch
  • Click on the block inserter, and add a navigation block
  • Click start with empty
  • Click on the block inserter in navigation
  • Click on Browse All. We should see the home link, but no custom post-types/taxonomies.
  • Verify that we can add a home link and edit the label value, and if it opens in a new tab
  • Verify that navigation menu nesting works as expected

WordPress Develop Master

  • Setup a local environment of your choice using wordpress-develop
  • Setup gutenberg and checkout this branch . One way of doing this on a local install is to link this via ln -s your-gutenberg-checkout-path your-wordpress-local-path/wp-content/plugins/gutenberg. Run npm run build in your gutenberg checkout
  • Install a plugin with some custom post types and taxonomies (optional, but it makes it obvious that we're using the server provided variations)
  • Edit a post or page
  • Click on the block inserter, and add a navigation block
  • Click start with empty
  • Click on the block inserter in navigation
  • Click on Browse all. We should see the home link, and installed custom post types and taxonomies as link variant options
    Verify that there are no errors in console or in the server error log.
  • Verify that we can add a home link and edit the label value, and if it opens in a new tab
  • Verify that navigation menu nesting works as expected

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Size Change: +194 B (0%)

Total Size: 1.46 MB

Filename Size Change
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@gwwar gwwar requested a review from mtias April 19, 2021 18:57
@gwwar gwwar added [Block] Navigation Affects the Navigation Block [Package] Block library /packages/block-library labels Apr 19, 2021
@jasmussen
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Took this for a spin, and I'm used to recording GIFs, but you did such an excellent job already, I can only confirm I'm seeing the same.

And give or take a few considerations, this feels like a good solution in that it's fairly basic and uses existing interfaces (block inserter) to accomplish it. It also seems like, if we solve #29423, then converting the Page List to manual menu items will map very well to this approach.

Two considerations, none of which I feel are necessary to solve here to land this:

  1. The fact that it looks like you can edit the link, even if the edit button is technically missing, makes it feel less resilient. It's a small thing, and it does enable you to open in a new tab. But that seems a rare use case that can be accomplished otherwise, and an entirely grayed link button, perhaps with a descriptive tooltip why, feels like it might be a better flow.
  2. Now that a number of blocks are available for the navigation block, showing the last 6 blocks used in the quick inserter feels increasingly like it obscures possibilities of the block. The fact that it uses some frecency also feels less optimal in this particular flow.

Number 2 is a more general thought about the quick inserter, and solutions should be looked at in context of all blocks, not just the navigation block. Reducing the frecency (making it change less often), and perhaps allowing a scrollbar or might help indicate that more blocks are available to insert.

Ultimately that means I think this approach feels like the safest and smallest path forward, with few downsides.

@mtias
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mtias commented Apr 20, 2021

I actually prefer the implementation at #30926.

A variation doesn't make a lot of sense to me given the block doesn't need editing of the url at all, nor nesting. By making it a variation the result is an increase in the complexity of the navigation link (by introducing allowEditing) and the fragility of the Home block (given it holds a url attribute that is not necessary, leading to the sync issue you describe).

@getdave
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getdave commented Apr 21, 2021

Just wondering how we might consider this mapping to the wp menu items in the Navigation Editor. For example, if I'm using the Navigation Editor and I add the Home variation then once #31004 is merged we will need to consider how to best "map" the block to an equivalent nav_menu_item object in the database.

AFAIK the current menus system doesn't support the concept of a dynamic "Home" link. Therefore we might need to store this with some special meta data to ensure the Editor and the Nav Block know how to parse it back into a Home variation from the menu item.

@gwwar
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gwwar commented Apr 21, 2021

AFAIK the current menus system doesn't support the concept of a dynamic "Home" link.

@getdave This is what I see when testing too. Using the customzier, adding a front page link is a custom link and does not get automatically updated when the static front page is changed.

This means we have some flexibility in how this is used. If it's possible we could enhance the menu data to also support this dynamic link, or we can have it fallback to using the url value of whatever home_url was at the time of serialization. I do think we'd end up needing some sort of meta value for MenuData -> NavigationLink, possibly a type of home or something similar?

@gwwar
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gwwar commented Apr 21, 2021

To reduce confusion I'm also closing this PR for now in favor of #30926 which I'm still working on.

@gwwar gwwar closed this Apr 21, 2021
@gwwar gwwar deleted the add/navigation-home-variation branch September 20, 2021 16:20
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Navigation Block: Add support for a dynamic home URL
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