CKEditor Ecosystem Documentation
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Table of contents

The table of contents feature lets you insert a widget with a list of headings (section titles) that reflects the structure of the document. The list stays up–to–date automatically as the user works on the document. Clicking a list item navigates the user to the corresponding document section.

This premium feature is a part of the Productivity Pack. The Productivity Pack is included in our commercial license. If you have an active CKEditor 5 license, please contact your Account Manager to check your eligibility. Some legacy licenses are not eligible for the exclusive Productivity Pack even if they are active. Contact us for more details.

You can also sign up for the CKEditor Premium Features 30-day free trial to test the feature.

# Demo

Create several headings in the editor and click the table of contents button Insert table of contents in the toolbar. Change the heading text or level to see the table of contents getting updated live.

The plant kingdom

The plant kingdom is a diverse group of organisms that includes both tiny algae and giant sequoias. Despite this diversity, all plants have a few things in common.

Plants are organisms that:

  • Have bodies made of multiple cells.
  • Can synthesize food in a process called photosynthesis.
  • Usually can’t move.
  • Have cells with walls made of cellulose.

Plants can be divided into two groups: those that make seeds and those that don’t.

Seedless plants

Plants in this group, called cryptogams, do not produce seeds.

Freshwater and marine algae

Green algae do not form true roots, stems, or leaves. This group gave rise to all land plants hundreds of millions of years ago.

Mosses and liverworts

Mosses and liverworts are the oldest land plants. They have a stem and structures resembling leaves and roots. Unlike other land plants, they lack a vascular system (a special tissue to transport water and nutrients).

Ferns and horsetails

Ferns and horsetails have distinct stems, leaves, and roots. They are the oldest vascular plants. This means that, unlike mosses and liverworts, they do have a vascular system that transports water and nutrients through their bodies.

Seed-producing plants

Plants in this group, called phanerogams, can produce seeds.

Non-flowering plants

Members of this group, called gymnosperms, are the first vascular plants to produce seeds. The seeds, unlike in flowering plants, don’t have an outer covering.

Conifers

Most members of this group are evergreen trees and shrubs. They are known for their needles (specialized leaves) and cones (where the seeds are kept). 

Ginkgos and cycads

Ginkgos and cycads are both very old plant groups. The only surviving ginkgo species is the ginkgo tree (Ginkgo biloba). Cycads resemble palm trees, but the two are not related. The latter belong to flowering plants.

Flowering plants

When you hear the word ‘plant’, you likely picture a member of this group. Called angiosperms, they form the most diverse and abundant division of the plant kingdom. Plants in this group can make flowers and fruits that enclose seeds.

# Installation

⚠️ New import paths

Starting with version 42.0.0, we changed the format of import paths. This guide uses the new, shorter format. Refer to the Packages in the legacy setup guide if you use an older version of CKEditor 5.

After installing the editor, add the feature to your plugin list and toolbar configuration:

import { ClassicEditor } from 'ckeditor5';
import { TableOfContents } from 'ckeditor5-premium-features';

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        plugins: [ TableOfContents, /* ... */ ],

        // Provide the licence key (see explanation below).
        licenseKey: '<YOUR_LICENSE_KEY>',

        toolbar: [ 'tableOfContents', /* ... */ ]
        // ...
    } )
    .then( /* ... */ )
    .catch( /* ... */ );

By default, the table of contents feature takes care of managing the heading IDs and creating proper links with a dedicated href attribute. The output data produced by this feature ensures that clicking a link in a table of contents will scroll to the corresponding heading in the content.

# Activating the feature

To use this premium feature, you need to activate it with proper credentials. Refer to the License key and activation guide for details.

Here are some more CKEditor 5 features that can help you navigate the content of the editor:

  • Document outline – Display the list of sections (headings) of the document next to the editor.
  • Content minimap – Navigate the document using a miniature overview map placed next to the editor.
  • Pagination – See the live preview of the document’s page breaks and quickly navigate between pages.

# Common API

The TableOfContents plugin registers:

  • The 'tableOfContents' UI button component.
  • The 'insertTableOfContents' command implemented by TableOfContentsCommand.

You can execute the command using the editor.execute() method:

// Insert the table of contents.
editor.execute( 'insertTableOfContents' );

We recommend using the official CKEditor 5 inspector for development and debugging. It will give you tons of useful information about the state of the editor such as internal data structures, selection, commands, and many more.