Typo3 Content Blocks

TYPO3 Content Blocks Development

Source: https://github.com/dirnbauer/webconsulting-skills

Compatibility: This skill targets TYPO3 v14.3+ with Content Blocks 2.x. Always match the Packagist friendsoftypo3/content-blocks constraint to your Core version. For Content Blocks 2.x, the line this skill targets, upstream requires TYPO3 ≥ 14.3 (typo3/cms-core: ^14.3) — confirm the exact patch constraint on Packagist. The 1.x line was v13-only and is not what a v14 project installs. Examples use TYPO3 v14 APIs and CB 2.x; adjust composer.json if upstream constraints differ.

TYPO3 API First: Always use TYPO3's built-in APIs, core features, and established conventions before creating custom implementations. Do not reinvent what TYPO3 already provides. Always verify that the APIs and methods you use exist and are not deprecated in TYPO3 v14 by checking the official TYPO3 documentation.

Migration Coverage: Content Blocks migration and cross-skill handoff guidance are documented directly in this skill and its local add-ons.

1. The Single Source of Truth Principle

Content Blocks is the modern approach to creating custom content types in TYPO3. It eliminates redundancy by providing a single YAML configuration that generates:

• TCA (Table Configuration Array)
• Database schema (SQL)
• TypoScript rendering
• Backend forms and previews
• Labels and translations

Why Content Blocks?

2. Installation

# Install via Composer (DDEV recommended)
ddev composer require friendsoftypo3/content-blocks

# After installation, clear caches
ddev typo3 cache:flush

Version constraint: Content Blocks 2.x requires TYPO3 ≥ 14.3 (typo3/cms-core: ^14.3, tightened to a specific patch in recent releases). Do not pin 1.x in a v14 project — it is the v13 line and will not resolve.

Security Configuration (Classic Mode)

For non-composer installations, deny web access to ContentBlocks folder:

# .htaccess addition
RewriteRule (?:typo3conf/ext|typo3/sysext|typo3/ext)/[^/]+/(?:Configuration|ContentBlocks|Resources/Private|Tests?|Documentation|docs?)/ - [F]

3. Content Types Overview

Content Blocks supports four content types:

4. Folder Structure

EXT:my_sitepackage/
└── ContentBlocks/
    ├── ContentElements/
    │   └── my-hero/
    │       ├── assets/
    │       │   └── icon.svg
    │       ├── language/
    │       │   └── labels.xlf
    │       ├── templates/
    │       │   ├── backend-preview.fluid.html
    │       │   ├── frontend.fluid.html
    │       │   └── partials/
    │       └── config.yaml
    ├── RecordTypes/
    │   └── my-record/
    │       ├── assets/
    │       │   └── icon.svg
    │       ├── language/
    │       │   └── labels.xlf
    │       └── config.yaml
    ├── PageTypes/
    │   └── blog-article/
    │       ├── assets/
    │       │   ├── icon.svg
    │       │   ├── icon-hide-in-menu.svg
    │       │   └── icon-root.svg
    │       ├── language/
    │       │   └── labels.xlf
    │       ├── templates/
    │       │   └── backend-preview.fluid.html
    │       └── config.yaml
    └── FileTypes/
        └── image-extended/
            ├── language/
            │   └── labels.xlf
            └── config.yaml

5. Creating Content Elements

Kickstart Command (Recommended)

# Interactive mode
ddev typo3 make:content-block

# One-liner
ddev typo3 make:content-block \
  --content-type="content-element" \
  --vendor="myvendor" \
  --name="hero-banner" \
  --title="Hero Banner" \
  --extension="my_sitepackage"

# After creation, update database
ddev typo3 cache:flush -g system
ddev typo3 extension:setup --extension=my_sitepackage

Predefined Basics (content elements)

List under basics: to pull in Core field groups: TYPO3/Header, TYPO3/Appearance, TYPO3/Links, TYPO3/Categories. See the Content Blocks basics reference.

Minimal Content Element

# EXT:my_sitepackage/ContentBlocks/ContentElements/hero-banner/config.yaml
name: myvendor/hero-banner
fields:
  - identifier: header
    useExistingField: true
  - identifier: bodytext
    useExistingField: true

Full Content Element Example

# EXT:my_sitepackage/ContentBlocks/ContentElements/hero-banner/config.yaml
name: myvendor/hero-banner
group: default
description: "A full-width hero banner with image and CTA"
prefixFields: true
prefixType: full
basics:
  - TYPO3/Appearance
  - TYPO3/Links
fields:
  - identifier: header
    useExistingField: true
  - identifier: subheadline
    type: Text
    label: Subheadline
  - identifier: hero_image
    type: File
    minitems: 1
    maxitems: 1
    allowed: common-image-types
  - identifier: cta_link
    type: Link
    label: Call to Action Link
  - identifier: cta_text
    type: Text
    label: Button Text

Frontend Template

<!-- templates/frontend.fluid.html -->
<html xmlns:f="http://typo3.org/ns/TYPO3/CMS/Fluid/ViewHelpers"
      xmlns:cb="http://typo3.org/ns/TYPO3/CMS/ContentBlocks/ViewHelpers"
      data-namespace-typo3-fluid="true">

<f:asset.css identifier="hero-banner-css" href="{cb:assetPath()}/frontend.css"/>

<section class="hero-banner">
    <f:if condition="{data.hero_image}">
        <f:for each="{data.hero_image}" as="image">
            <f:image image="{image}" alt="{data.header}" class="hero-image"/>
        </f:for>
    </f:if>
    
    <div class="hero-content">
        <h1>{data.header}</h1>
        <f:if condition="{data.subheadline}">
            <p class="subheadline">{data.subheadline}</p>
        </f:if>
        
        <f:if condition="{data.cta_link}">
            <f:link.typolink parameter="{data.cta_link}" class="btn btn-primary">
                {data.cta_text -> f:or(default: 'Learn more')}
            </f:link.typolink>
        </f:if>
    </div>
</section>
</html>

shadcn/ui Frontend Template Pattern

When a Content Block should follow shadcn/ui styling, keep the Content Block YAML as the content model and move repeated visual structure into shared Fluid components. The frontend.fluid.html entrypoint should map {data} fields to typed atomic components rather than duplicating bespoke CSS in every block.

<!-- templates/frontend.fluid.html -->
<html xmlns:f="http://typo3.org/ns/TYPO3/CMS/Fluid/ViewHelpers"
      xmlns:d="http://typo3.org/ns/Vendor/Sitepackage/Components/ComponentCollection"
      data-namespace-typo3-fluid="true">

<section class="py-12 md:py-16">
    <d:molecule.card class="mx-auto max-w-2xl">
        <d:molecule.cardHeader>
            <d:molecule.cardTitle>{data.header}</d:molecule.cardTitle>
            <f:if condition="{data.subheadline}">
                <d:molecule.cardDescription>{data.subheadline}</d:molecule.cardDescription>
            </f:if>
        </d:molecule.cardHeader>
        <d:molecule.cardContent>
            <f:format.html>{data.bodytext}</f:format.html>
        </d:molecule.cardContent>
    </d:molecule.card>
</section>
</html>

Guidelines:

• Preserve existing field identifiers, fixture.json, labels, and editor workflows unless the content model itself is changing.
• Use shared Fluid components for shadcn primitives such as Button, Badge, Card, Form controls, Tabs, Accordion, Alert, Table, and Sheet/Dialog shells.
• Put <f:argument> type contracts in reusable Fluid components and partials. Avoid adding required arguments to a Content Block entry template unless the render context is fully controlled.
• Use f:asset.css / f:asset.script only for block-specific assets. Shared shadcn/Tailwind tokens and utility classes belong in the site CSS entrypoint.
• For interactive shadcn patterns, use Alpine or small vanilla controllers with ARIA and data-state attributes instead of React/Radix runtime dependencies.
• Create or update styleguide fixtures so every Content Block can be rendered with realistic content in light and dark mode.

Backend Preview Template

<!-- templates/backend-preview.fluid.html -->
<html xmlns:f="http://typo3.org/ns/TYPO3/CMS/Fluid/ViewHelpers"
      xmlns:be="http://typo3.org/ns/TYPO3/CMS/Backend/ViewHelpers"
      data-namespace-typo3-fluid="true">

<div class="content-block-preview">
    <strong>{data.header}</strong>
    <f:if condition="{data.subheadline}">
        <br/><em>{data.subheadline}</em>
    </f:if>
    <f:if condition="{data.hero_image}">
        <f:for each="{data.hero_image}" as="image">
            <be:thumbnail image="{image}" width="100" height="100"/>
        </f:for>
    </f:if>
</div>
</html>

Detailed Reference

Read the full guide when the task needs detailed examples, long templates, troubleshooting matrices, appendices, or sections not included above. Keep this file unloaded for narrow tasks so the skill follows progressive disclosure.

For migrations and silent data-contract failures, also read Common Pitfalls & Hard-Won Lessons.