I am adding a PluginSidebar to Gutenberg and it works until I try to add a meta field to the sidebar. Then it doesn't work. I'm not sure why though.

import { registerPlugin } from "@wordpress/plugins";
import { PluginSidebar, PluginSidebarMoreMenuItem } from "@wordpress/edit-post";
import { __ } from "@wordpress/i18n";

import { PanelBody, ToggleControl } from '@wordpress/components';

registerPlugin( 'page-layout-plugin', {
    icon: 'smiley',
    render: ( props ) => {
        return (
            title="Gutenberg Settings Sidebar"
                label={__('Show Sidebar?', 'starter')}
                onChange={(val) => props.setAttributes({showSidebarAttribute: val})}
} );

This is the code before compiling it. The error I am getting it below. I read that we can create the attribute name to be saved so I'm not sure why it isn't working. Any help would be greatly appreciated. enter image description here

2 Answers 2


You forgot to declare the attributes:

registerPlugin( 'page-layout-plugin', {
    icon: 'smiley',
    attributes: {
      'showSidebarAttribute': {'type': 'boolean', 'default': true}, // <-- and maybe others
    render: ( props ) => {

You can drop the quotes of the properties, of course (they are optional), I keep them because the equivalent statement is copied over from the PHP part where the quotes are necessary:

 'showSidebarAttribute' => ['type' => 'boolean', 'default' => true],
  • I am still getting the undefined error sadly
    – JayDev95
    Mar 23, 2023 at 12:01

The issue is that you are conflating registerPlugin with registerBlockType. The render property in registerPlugin doesn't receive any props so both props.attributes and props.setAttributes are not defined here.

Where do you want this data to be saved?

  • I wanted it saved as meta data
    – JayDev95
    Mar 25, 2023 at 4:33

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