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InnerBlocks

InnerBlocks exports a pair of components which can be used in block implementations to enable nested block content.

Refer to the implementation of the Columns block as an example resource.

Usage

In a block's edit implementation, render InnerBlocks. Then, in the save implementation, render InnerBlocks.Content. This will be replaced automatically with the content of the nested blocks.

import { registerBlockType } from '@wordpress/blocks';
import { useBlockProps, InnerBlocks } from '@wordpress/block-editor';

registerBlockType( 'my-plugin/my-block', {
	// ...

	edit() {
		const blockProps = useBlockProps();

		return (
			<div { ...blockProps }>
				<InnerBlocks />
			</div>
		);
	},

	save() {
		const blockProps = useBlockProps.save();

		return (
			<div { ...blockProps }>
				<InnerBlocks.Content />
			</div>
		);
	},
} );

Note: A block can render at most a single InnerBlocks and InnerBlocks.Content element in edit and save respectively. To create distinct arrangements of nested blocks, create a separate block type which renders its own InnerBlocks and assign as the sole allowedBlocks type.

Note: Because the save step will automatically apply props to the element returned by save, it is important to include the wrapping div in the above simple example even though we are applying no props of our own. In a real-world example, you may have your own attributes to apply to the saved markup, or sibling content adjacent to the rendered nested blocks.

Note: Inner blocks, by default, are not visible inside a WordPress excerpt. If you wish your block to appear then it needs to be returned from the excerpt_allowed_wrapper_blocks filter. More details can be found on the filter reference page page, as well as the excerpt_remove_blocks page.

Props

allowedBlocks

  • Type: Boolean|Array<String>
  • Default: true

allowedBlocks can contain an array of strings, each string should contain the identifier of a block. When allowedBlocks is set it is only possible to insert blocks part of the set specified in the array.

const ALLOWED_BLOCKS = [ 'core/image', 'core/paragraph' ];
...
<InnerBlocks
    allowedBlocks={ ALLOWED_BLOCKS }
/>

The previous code block creates an InnerBlocks area where only image and paragraph blocks can be inserted.

Child blocks that have marked themselves as compatible are not excluded from the allowed blocks. Even if allowedBlocks doesn't specify a child block, a registered child block will still appear on the inserter for this block.

const ALLOWED_BLOCKS = [];
...
<InnerBlocks
    allowedBlocks={ ALLOWED_BLOCKS }
/>

The previous code block restricts all blocks, so only child blocks explicitly registered as compatible with this block can be inserted. If no child blocks are available: it will be impossible to insert any inner blocks.

If allowedBlocks is set to true, all blocks are allowed. false means no blocks are allowed.

orientation

  • Type: "horizontal"|"vertical"|undefined

Indicates whether inner blocks are shown horizontally or vertically. Use the string 'horizontal' or 'vertical' as a value. When left unspecified, defaults to 'vertical'.

While this prop doesn't change any styles for the inner blocks themselves, it does display the Block Movers in the correct orientation, and also ensures drag and drop works correctly.

template

  • Type: Array<Array<Object>>

The template is defined as a list of block items. Such blocks can have predefined attributes, placeholder, content, etc. Block templates allow specifying a default initial state for an InnerBlocks area. More information about templates can be found in template docs.

const TEMPLATE = [ [ 'core/columns', {}, [
    [ 'core/column', {}, [
        [ 'core/image' ],
    ] ],
    [ 'core/column', {}, [
        [ 'core/paragraph', { placeholder: 'Enter side content...' } ],
    ] ],
] ] ];
...
<InnerBlocks
    template={ TEMPLATE }
/>

The previous example creates an InnerBlocks area containing two columns one with an image and the other with a paragraph.

templateInsertUpdatesSelection

  • Type: Boolean
  • Default: false

If true when child blocks in the template are inserted the selection is updated. If false the selection should not be updated when child blocks specified in the template are inserted.

templateLock

  • Type: String|Boolean

Template locking of InnerBlocks is similar to Custom Post Type templates locking.

Template locking allows locking the InnerBlocks area for the current template. Options:

  • contentOnly — prevents all operations. Additionally, the block types that don't have content are hidden from the list view and can't gain focus within the block list. Unlike the other lock types, this is not overrideable by children.
  • 'all' — prevents all operations. It is not possible to insert new blocks. Move existing blocks or delete them.
  • 'insert' — prevents inserting or removing blocks, but allows moving existing ones.
  • false — prevents locking from being applied to an InnerBlocks area even if a parent block contains locking. ( Boolean )

If locking is not set in an InnerBlocks area: the locking of the parent InnerBlocks area is used. Note that contentOnly can't be overriden: it's present, the templateLock value of any children is ignored.

If the block is a top level block: the locking of the Custom Post Type is used.

renderAppender

  • Type: Component|false
  • Default: - undefined. When renderAppender is not specified, the default appender is shown. If a false value is provided, no appender is rendered.

A component to show as the trailing appender for the inner blocks list.

Notes

  • For convenience two predefined appender components are exposed on InnerBlocks which can be used for the prop:
    • InnerBlocks.ButtonBlockAppender - display a + (plus) icon button as the appender.
    • InnerBlocks.DefaultBlockAppender - display the default block appender, typically the paragraph style appender when the paragraph block is allowed.
  • Consumers are also free to pass any valid component. This provides the full flexibility to define a bespoke block appender.

Example usage

// Utilise a predefined component
<InnerBlocks
	renderAppender={ InnerBlocks.ButtonBlockAppender }
/>

// Don't display an appender
<InnerBlocks
	renderAppender={ false }
/>

// Fully custom
<InnerBlocks
	renderAppender={ MyAmazingAppender }
/>

__experimentalCaptureToolbars

  • Type: Boolean
  • Default: false

Determines whether the toolbars of all child Blocks (applied deeply, recursive) should have their toolbars "captured" and shown on the Block which is consuming InnerBlocks.

For example, a button block, deeply nested in several levels of block X that utilizes this property will see the button block's toolbar displayed on block X's toolbar area.

placeholder

  • Type: Function
  • Default: - undefined. The placeholder is an optional function that can be passed in to be a rendered component placed in front of the appender. This can be used to represent an example state prior to any blocks being placed. See the Social Links for an implementation example.