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Interactivity API: router with region-based client-side navigation #53733

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luisherranz
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@luisherranz luisherranz commented Aug 16, 2023

What?

This PR adds support for region-based client-side navigation.

It works with a new directive called data-wp-navigation-id which must be unique. Once those ids are in place, you can use navigate (exported for now in @wordpress/interactivity) to navigate to another page. Only the regions marked with data-wp-navigation-id will be replaced.

Why?

Because with the Interactivity API, we can replace regions of the DOM with server-generated content while maintaining the UI state.

Use cases include:

  • Client-side pagination of the Query block.
  • Client-side submission of the Comments Form block.

How?

Based on @DAreRodz's Woo PR: woocommerce/woocommerce-blocks#10200

Apart from that, I added new options to navigate and prefetch:

  • force: when true, it bypasses the client page cache.
  • html: when it's a string, it doesn't fetch the URL and uses that HTML instead
  • replace: when it's true, it uses history.replaceState instead of history.pushState.

Tasks

  • Add changelog
  • Add e2e tests

We decided to leave these tasks for a following PR:

  • Add JSDocs
  • Add documentation

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github-actions bot commented Aug 16, 2023

Size Change: +413 B (0%)

Total Size: 1.51 MB

Filename Size Change
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ℹ️ View Unchanged
Filename Size
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compressed-size-action

@luisherranz luisherranz self-assigned this Aug 16, 2023
@luisherranz luisherranz added [Feature] Interactivity API API to add frontend interactivity to blocks. [Type] Feature New feature to highlight in changelogs. labels Aug 16, 2023
@luisherranz luisherranz added [Type] New API New API to be used by plugin developers or package users. and removed [Type] Feature New feature to highlight in changelogs. labels Aug 16, 2023
@luisherranz luisherranz assigned DAreRodz and unassigned luisherranz Aug 17, 2023
@luisherranz
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I think it's confusing to use navigation in data-wp-navigation-id if navigation is going to be the namespace of the Navigation block ("core/navigation").

If router is going to be the namespace of the router ("core/router"), you should use something that has the router namespace in it, like: data-wp-router-region or data-wp-router-region-id.

What do you think, @DAreRodz?

@DAreRodz
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Hey @ajgagnon, loading states still need to be implemented, but it's already in our roadmap (see #53740), so it'll be implemented soon.

Our current idea is to expose the current loading status in the global state―under the router namespace.

@DAreRodz
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you should use something that has the router namespace in it, like: data-wp-router-region or data-wp-router-region-id

Agree, and I think those names are easy to understand as well, so you have my +1 👍.

@luisherranz
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Let's go with data-wp-router-region-id then. I think the id conveys the uniqueness requirement so it's a bit more explicit.

@DAreRodz
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@luisherranz, I assume we need to add the data-wp-router-link as well, am I right?

@luisherranz
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@luisherranz, I assume we need to add the data-wp-router-link as well, am I right?

No, let's keep the navigate logic inside actions instead of directives for now.

@luisherranz
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I've just noticed a problem while working on data-wp-key: the data-wp-router-region-id needs to match with data-wp-interactive. If not, Preact recreates all the nodes from scratch (it doesn't do a diff of the DOM). This is because Preact's vDOM starts with data-wp-interactive, but when you do a navigation, it starts with data-wp-router-region-id so Preact doesn't have a previous "root" node.

Therefore, I think this should be an option of data-wp-interactive instead of a different directive. Something like: data-wp-interactive='{ "region-id": "some-id" }'. Regions inside other regions are ignored (like data-wp-interactive).

I also noticed that we are doing the toVdom twice for the initial page (once for data-wp-interactive and once for data-wp-router-region-id). If we make this change, we can save the vDOM of each data-wp-interactive that has a region-id and avoid that extra processing.

What do you think? Do you see any problem or inconvenience?

@ajgagnon
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Hey @ajgagnon, loading states still need to be implemented, but it's already in our roadmap (see #53740), so it'll be implemented soon.

Our current idea is to expose the current loading status in the global state―under the router namespace.

Thanks! I did see that right after I posted 🤦🏼‍♂️ Global state makes a lot of sense!

@alexstine
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I am not following this PR for now as it looks to still be under dev but please note the accessibility concerns around using JS this way. Dynamically rendering parts of the page comes with huge implications for people who can't see changes happening if not properly communicated. With great power comes great responsibility. This is still a problem in Gutenberg today so I am super hesitant to make this available to the front-end.

Please ping me when this is ready for proper review.

Thanks.

@luisherranz
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Hi @alexstine. Yes, we're aware of the accessibility challenges, and we have plans to work on them.

At this moment, we're only experimenting with this here and here, so my plan is to address the accessibility in those PRs. I was planning to ping you once that initial accessibility work was done so you can review it 🙂

Once we learn more, we can find ways to include accessibility on the underlying APIs to ensure people building on top of this make things right (the Interactivity API is still experimental so nobody should be using it in production yet).

@luisherranz
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Global state makes a lot of sense!

Hey @ajgagnon, I think we're going to add it manually first. Once we learn more, we can look into ways to make it globally accessible. Same for changing the scroll position and accessibility.

So for now, we'll use something like this (simplified):

store({
  actions: {
    core: {
      query: {
        navigate: async ({ ref, context }) => {
          context.core.query.isLoading = true;
          speak(state.core.query.loadingPageMessage);
          await navigate(ref.href);
          context.core.query.isLoading = false;
          speak(state.core.query.pageLoadedMessage);
          const firstFocusableItem = getFirstFocusableItem(ref);
          firstFocusableItem.focus();
          firstFocusableItem.scrollIntoView();
        },
      },
    },
  },
});

@luisherranz luisherranz force-pushed the add/interactivity-api-regions-based-client-side-navigation branch from 9bac437 to 79ecdbb Compare August 21, 2023 10:35
…ide navigation (#53853)

* Add failing test

* Fix the test

* Add changelog

* Fix lint error
luisherranz and others added 5 commits August 22, 2023 12:00
* Add failing test

* Fix test using key

* Replace key with data-wp-key

* Refactor test a bit

* Add changelog

* Add docs

* Remove unnecessary paragraph

* Fix lint error
@luisherranz
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Let's make the data-wp-interactive change I mentioned previously in a separate PR. I think this is good enough as it is so people can start testing the enhanced UX of the Query and Comments blocks as soon as possible.

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The tests are great, David!

I can't approve because it's my own PR, but consider them approved 🙂

@DAreRodz DAreRodz marked this pull request as ready for review August 28, 2023 08:19
@DAreRodz
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Docs for the region-based router directives still need to be included. They'll be added in a subsequent PR.

@DAreRodz DAreRodz merged commit 640150a into trunk Aug 28, 2023
@DAreRodz DAreRodz deleted the add/interactivity-api-regions-based-client-side-navigation branch August 28, 2023 08:36
@github-actions github-actions bot added this to the Gutenberg 16.6 milestone Aug 28, 2023
@properlypurple properlypurple mentioned this pull request Oct 11, 2023
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[Feature] Interactivity API API to add frontend interactivity to blocks. [Type] New API New API to be used by plugin developers or package users.
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4 participants