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<?php
/**
* List post headings
* @see https://www.billerickson.net/access-gutenberg-block-data/
*/
function be_list_post_headings() {
global $post;
$blocks = parse_blocks( $post->post_content );
$headings = array();
foreach( $blocks as $block ) {
if( 'core/heading' === $block['blockName'] ) {
if( false !== strpos( $block['innerHTML'], 'id=' ) ) {
$element = 'h' . $block['attrs']['level'];
$title = str_replace( array( '<' . $element, 'id="', '</' . $element ), array( '<a', 'href="#', '</a' ), $block['innerHTML'] );
} else {
$title = wp_strip_all_tags( $block['innerHTML'] );
}
$headings[] = $title;
}
}
if( !empty( $headings ) ) {
echo '<ol class="table-of-contents">';
foreach( $headings as $heading )
echo '<li>' . $heading . '</li>';
echo '</ol>';
}
}
add_action( 'genesis_before_entry', 'be_list_post_headings' );
@certainlyakey
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certainlyakey commented Oct 13, 2019

Unfortunately there's a bug in Gutenberg now that only fills $block['attrs']['level'] for H1 headings.

@billerickson
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Author

billerickson commented Oct 15, 2019

Hopefully the bug will be resolved soon. There's no good reason for WordPress to not include the heading level in there.

@LukaszJaro
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LukaszJaro commented May 25, 2020

Same issue with https://github.com/sortabrilliant/guidepost

No column support due to gutenberg bug.

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