Symfony with Sonata Admin Bundle and rich HTML editor

I successfully configured Sonata Admin v3.2 and Sonata Media Bundle in my Symfony 2.8 installation. As you can see the back-end is working fine:

I wanted to render the content property as a rich HTML so I followed the appropriate guide:

https://sonata-project.org/bundles/formatter/3-x/doc/reference/formatter_widget.html

I configured the SonataFormatterBundle following the guide step by step but the field doesn't render correctly. This is my config:

#Sonata with Symfony >= 2.6
form_themes:
    - 'SonataFormatterBundle:Form:formatter.html.twig'

sonata_block:
    default_contexts: [cms]
    blocks:
        # Enable the SonataAdminBundle block
        sonata.admin.block.admin_list:
            contexts:   [admin]
        # Your other blocks
        sonata.formatter.block.formatter:

sonata_formatter:
ckeditor:
    templates:
        browser: 'SonataFormatterBundle:Ckeditor:browser.html.twig'
        upload: 'SonataFormatterBundle:Ckeditor:upload.html.twig'
default_formatter: richhtml
formatters:
    markdown:
        service: sonata.formatter.text.markdown
        extensions:
            - sonata.formatter.twig.control_flow
            - sonata.formatter.twig.gist
            - sonata.media.formatter.twig


    text:
        service: sonata.formatter.text.text
        extensions:
            - sonata.formatter.twig.control_flow
            - sonata.formatter.twig.gist
            - sonata.media.formatter.twig


    rawhtml:
        service: sonata.formatter.text.raw
        extensions:
            - sonata.formatter.twig.control_flow
            - sonata.formatter.twig.gist
            - sonata.media.formatter.twig


    richhtml:
        service: sonata.formatter.text.raw
        extensions:
            - sonata.formatter.twig.control_flow
            - sonata.formatter.twig.gist
            - sonata.media.formatter.twig


    twig:
        service: sonata.formatter.text.twigengine
        extensions: [] # Twig formatter cannot have extensions

And this is my PostAdmin class:

protected function configureFormFields(FormMapper $formMapper)
{
    $formMapper
        ->add('title')
        ->add('content', 'sonata_simple_formatter_type', array(
            'format' => 'richhtml',
            'ckeditor_context' => 'default', // optional
        ))
        ->add('category')
    ;
}

The page is not showing any errors but the field stays as a normal textarea (see my above screenshot).

Solution

So, for those who are not looking into comments:

The rich text editors in SonataFormatterBundle need some Javascript and Stylesheets to work. You need to add those in your admin layout template as described here.

Copied from documentation (Code for Version 3.x):

{% extends 'SonataAdminBundle::standard_layout.html.twig' %}

{% block stylesheets %}
{{ parent() }}

<link rel="stylesheet" href="{{ asset('bundles/sonataformatter/markitup/skins/sonata/style.css') }}" type="text/css" media="all" />
<link rel="stylesheet" href="{{ asset('bundles/sonataformatter/markitup/sets/markdown/style.css') }}" type="text/css" media="all" />
<link rel="stylesheet" href="{{ asset('bundles/sonataformatter/markitup/sets/html/style.css') }}" type="text/css" media="all" />
<link rel="stylesheet" href="{{ asset('bundles/sonataformatter/markitup/sets/textile/style.css') }}" type="text/css" media="all" />
{% endblock %}

{% block javascripts %}
{{ parent() }}

<script src="{{ asset('bundles/ivoryckeditor/ckeditor.js') }}" type="text/javascript"></script>
<script src="{{ asset('bundles/sonataformatter/vendor/markitup-markitup/markitup/jquery.markitup.js') }}" type="text/javascript"></script>
<script src="{{ asset('bundles/sonataformatter/markitup/sets/markdown/set.js') }}" type="text/javascript"></script>
<script src="{{ asset('bundles/sonataformatter/markitup/sets/html/set.js') }}" type="text/javascript"></script>
<script src="{{ asset('bundles/sonataformatter/markitup/sets/textile/set.js') }}" type="text/javascript"></script>
{% endblock %}