I have set some css classes for the boxes in the Gutenberg editor, and I can type it in the additional css input box, it is not a problem for me, but for the client it is not convenient, because he does not know and he forget them. There is a way to have a drop-down with all the custom classes instead of a simple input field?

Thank you.


You should add a custom plugin. That's need a PHP main file that include, register a JavaScript file. The source below should result in an plugin. You find a usable solution also in the probs below.

PHP part

add_action( 'enqueue_block_editor_assets', 'my_gutenberg_scripts' );
function my_gutenberg_scripts() {

        plugins_url( 'editor.js', __FILE__ ),
        array( 'wp-blocks' ), // Necessary script handles.
        filemtime( plugins_url( 'editor.js', __FILE__ ) ),

    wp_enqueue_script( 'my-editor-enhancement' );

JavaScript part

In our example is this the code of the editor.js, that we enqueue above. The example add only one paragraph and two different heading types.

wp.domReady( () => {

    wp.blocks.registerBlockStyle( 'core/paragraph', {
        name: 'blue-paragraph',
        label: 'Blue Paragraph'
    } );

    wp.blocks.registerBlockStyle( 'core/heading', {
        name: 'default',
        label: 'Default',
        isDefault: true,
    } );

    wp.blocks.registerBlockStyle( 'core/heading', {
        name: 'alt',
        label: 'Alternate',
        isDefault: false,
    } );

} );

If you add isDefault: true, then this style will be marked as active on visible blocks that don’t already have a style specified.

core blocks

  • core/paragraph
  • core/image
  • core/heading
  • core/gallery
  • core/list
  • core/quote
  • core/audio
  • core/cover
  • core/file
  • core/video
  • core/preformatted
  • core/code
  • core/freeform
  • core/html
  • core/pullquote
  • core/table
  • core/verse
  • core/button
  • core/columns
  • core/media-text
  • core/more
  • core/nextpage
  • core/separator
  • core/spacer
  • core/shortcode
  • core/archives
  • core/categories
  • core/latest-comments
  • core/latest-posts

Removing blocks

JavaScript part

 wp.domReady( () => {
    wp.blocks.unregisterBlockStyle( 'core/button', 'default' );
    wp.blocks.unregisterBlockStyle( 'core/button', 'outline' );
    wp.blocks.unregisterBlockStyle( 'core/button', 'squared' );
} );


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Finally, I find an alternative solution here: https://www.billerickson.net/block-styles-in-gutenberg/

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  • 2
    I add a longer answer that helps user to get a valid answer, also if we lost the source of the link. – bueltge Mar 26 '19 at 19:12

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