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Experiment: "Live block" using the latest-comments block #38843

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@michalczaplinski michalczaplinski commented Feb 16, 2022

This is an experiment in "server components" pattern. It's related to the #38713 as this PR is using the same pattern of data loading + morphdom.

Here, I have created a new block called latest-comments-filter which dynamically loads the HTML for the latest-comments block from the props passed to the block-renderer endpoint. It then uses morphdom to update the latest-comments block's DOM with new HTML.

Some video demos (there is some vague speculation at the end of the first video, sorry for that 😅)

2022-02-15_19-22-27.mp4

I've forgotten to mention some additional stuff so short part 2:

2022-02-15_19-42-23.mp4

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Size Change: +229 B (0%)

Total Size: 1.15 MB

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@michalczaplinski michalczaplinski marked this pull request as draft February 16, 2022 01:20
@michalczaplinski michalczaplinski added [Feature] Blocks Overall functionality of blocks [Type] Technical Prototype Offers a technical exploration into an idea as an example of what's possible labels Feb 16, 2022
@gziolo
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gziolo commented Feb 16, 2022

I'm so glad you are exploring this approach. It made me realize that the block-renderer REST API endpoint isn't aware of the context where it is being rendered. In the block editor, all the data that the block needs are passed explicitly. The biggest challenge on the frontend would be to replicate the entire block context that is easy to access when you have the whole app rendered in the editor. See https://github.com/WordPress/gutenberg/blob/trunk/docs/reference-guides/block-api/block-context.md.

To give an example let's use the Comment Content block. It reads the comment id from the block context:

function render_block_core_comment_content( $attributes, $content, $block ) {
if ( ! isset( $block->context['commentId'] ) ) {
return '';
}

I checked the existing core blocks that use the ServerSideRenderer component which is a tiny wrapper over the same endpoint. It looks like the usage is limited only to passing block attributes. The Calendar block is probably the closest example where some global variables are overridden through the attribute passed as REST params:

<ServerSideRender
block="core/calendar"
attributes={ { ...attributes, ...getYearMonth( date ) } }
/>

$previous_monthnum = $monthnum;
$previous_year = $year;
if ( isset( $attributes['month'] ) && isset( $attributes['year'] ) ) {
$permalink_structure = get_option( 'permalink_structure' );
if (
strpos( $permalink_structure, '%monthnum%' ) !== false &&
strpos( $permalink_structure, '%year%' ) !== false
) {
// phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
$monthnum = $attributes['month'];
// phpcs:ignore WordPress.WP.GlobalVariablesOverride.OverrideProhibited
$year = $attributes['year'];
}
}

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