ServerSideRender does not expose block's content

[barryceelen]

The block's HTML is passed along to the render function of a dynamic block. When using ServerSideRender the block's HTML is not made available to the render function, only it's attributes are passed along via the API request:

https://github.com/WordPress/gutenberg/blob/master/lib/class-wp-rest-block-renderer-controller.php#L149

One can access the block's HTML via the block's attributes (that would enable me to pass the html to the render function by adding it to the attributes), but that html content does not include nested blocks as they are within HTML comments:

content: {
	type: 'string',
	source: 'html',
},

I've tried accessing the block's "raw" unparsed HTML in my edit function but have not found a way to do so, is this exposed in any way?

[aduth]

Can you confirm whether this is a duplicate of #8214 ? (Discussion ongoing in #8760)

[barryceelen]

Thanks @aduth, this is not a duplicate of #8214

Context:

I'm creating a block preview using <ServerSideRender />. The block uses the php render callback to parse the block's saved HTML content.

The block's content is made available as $inner_content to the render function (in addition to the block's attributes) when rendering it in the theme's template:
https://github.com/WordPress/gutenberg/blob/master/lib/blocks.php#L240

But the content is not available (only the block's attributes) when rendering the block via ServerSideRender:
https://github.com/WordPress/gutenberg/blob/master/lib/class-wp-rest-block-renderer-controller.php#L149

[fabiankaegy]

I am also running into this issue. There is no way to pass the InnerBlocks html string to the block renderer Rest endpoint. Which is something that I believe would be very useful.

The Endpoint /wp/v2/block-renderer/${ block } takes the blocks attributes as query args, but not the InnerBlocks markup string.