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Page List: Show empty placeholder if no items #35441

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merged 4 commits into from Oct 8, 2021
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@mkaz mkaz commented Oct 7, 2021

Description

If no pages exist the Page List block will be empty, making it impossible to select in the rendered view in editor. This PR adds an empty placeholder to show where the block would be and allows for selecting in rendered view.

The Page List block can be empty if a user deletes all pages, or while working on #31471 there may be no children when showing a child list.

How has this been tested?

  • Add a Page List to a post or page
  • Confirm it shows fine
  • Delete all pages from your site
  • View post with Page List block and confirm it is not shown
  • Apply PR change
  • View post again and confirm page list shows

Screenshots

image

Types of changes

  • Add empty response placeholder for empty server-side render response
  • Updates render_callback to return early and empty if no top level pages

@mkaz mkaz added the [Block] Page List Affects the Page List Block label Oct 7, 2021
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mkaz commented Oct 7, 2021

@jasmussen I use just the default <Placeholder/> component but it doesn't render with nice padding. I can add some in, or other suggestion for design on the placeholder?

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github-actions bot commented Oct 7, 2021

Size Change: +2.2 kB (0%)

Total Size: 1.07 MB

Filename Size Change
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build/block-library/blocks/site-logo/style-rtl.css 165 B +12 B (+8%) 🔍
build/block-library/blocks/site-logo/style.css 165 B +12 B (+8%) 🔍
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ℹ️ View Unchanged
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Looks good! Just a minor comment below, but not a blocker.

// Return early and empty to trigger EmptyResponsePlaceholder.
if ( empty( $top_level_pages ) ) {
return;
}
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We could return even earlier if we instead checked $all_pages above.

@jasmussen
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Nice one! Before:
Screenshot 2021-10-08 at 10 16 33

After:

Screenshot 2021-10-08 at 10 21 52

The first is the page list inside navigation, the second is just a standalone page list.

I also confirmed that the placeholder is only shown in the editor.

However, in light of what we're doing to other FSE blocks (see #35243 and #35242), I think we should avoid the use of the Placeholder component entirely. It feels entirely sufficient to output just the text phrase, and inherit everything else from the theme. That way it's substantially easier for a theme developer to develop their theme, to see that styles are correctly inherited, and to not have to worry about the clunky placeholder and the editor styles it brings with it isn't the source of trouble.

Removing the placeholder could make it look like this:
Screenshot 2021-10-08 at 10 24 42

This is the markup I inspected myself to:

Screenshot 2021-10-08 at 10 24 49

@mkaz
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mkaz commented Oct 8, 2021

Thanks @tellthemachines good catch, I moved the check up even earlier, which also makes it more clear.

Thanks @jasmussen, I simplified the placeholder to just that span tag. 👍

@jasmussen
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Nice! Ship it.

@mkaz mkaz merged commit 7fcbfdb into trunk Oct 8, 2021
@mkaz mkaz deleted the fix/empty-page-list branch October 8, 2021 15:18
@github-actions github-actions bot added this to the Gutenberg 11.8 milestone Oct 8, 2021
@jasmussen
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@mkaz Two side effects of this one:

  1. The spinner now seems to appear very often (see GIF below)
  2. When first opening up the Site Editor, the Page List will show "Page List: No pages." for a very long time while loading.

GIF showing the message, and the spinner recurring:
spinner

This makes the block feel a bit brittle. Can we follow up with a few tweaks?

  • Never show the spinner in this block, it shouldn't be doing any loading work after the initial load.
  • Delay the "No pages" message until we're absolutely sure there really are no pages.

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