EasyAdminMarkdownBundle

A Markdown editor field for EasyAdmin, powered by the EasyMDE JavaScript editor.

It provides a MarkdownEditorField that behaves like EasyAdmin's built-in TextEditorField (which uses Trix), but lets your users write Markdown with a live preview, a toolbar and keyboard shortcuts. On the detail page the stored Markdown is rendered as sanitized HTML.

Installation

Make sure Composer is installed globally, as explained in the installation chapter of the Composer documentation.

Step 1: Install the bundle

composer require clementtalleu/easyadmin-markdown-bundle

If your application uses Symfony Flex, the bundle is enabled automatically. Otherwise, enable it by hand in config/bundles.php:

// config/bundles.php

return [
    // ...
    ClementTalleu\EasyAdminMarkdownBundle\ClementTalleuEasyAdminMarkdownBundle::class => ['all' => true],
];

Step 2: Install the EasyMDE assets

The bundle never ships third-party JavaScript itself, so you add EasyMDE to your application's importmap. Use the self-contained build (it bundles CodeMirror and marked), which works reliably with AssetMapper:

php bin/console importmap:require easymde/dist/easymde.min.js
php bin/console importmap:require easymde/dist/easymde.min.css

That's it — the field automatically loads its own JavaScript (as an ES module) and stylesheet from the bundle, and the editor resolves EasyMDE from your importmap. No importmap.php editing is required.

Step 3 (optional): Enable HTML rendering on the detail page

To render the Markdown as HTML on the detail page, install a Markdown parser:

composer require league/commonmark

If you skip this step, the detail page falls back to displaying the raw Markdown source as plain text.

Usage

Use the field in any EasyAdmin CRUD controller, exactly like the native fields:

use ClementTalleu\EasyAdminMarkdownBundle\Field\MarkdownEditorField;
use EasyCorp\Bundle\EasyAdminBundle\Controller\AbstractCrudController;

class ArticleCrudController extends AbstractCrudController
{
    public function configureFields(string $pageName): iterable
    {
        yield MarkdownEditorField::new('content');
    }
}

Options

setNumOfRows()

Sets the initial height (in rows) of the editor when its content is empty:

MarkdownEditorField::new('content')->setNumOfRows(20);

setEasyMdeConfig()

Passes any EasyMDE configuration option to the editor. The array is JSON-encoded and forwarded to the EasyMDE constructor on the client side:

MarkdownEditorField::new('content')->setEasyMdeConfig([
    'hideIcons' => ['guide', 'fullscreen'],
    'tabSize' => 4,
    'placeholder' => 'Write your story…',
]);

By default the bundle disables EasyMDE's built-in spell checker and status bar, and does not download Font Awesome (EasyAdmin already provides icons). You can re-enable any of these through setEasyMdeConfig().

renderAsHtml()

Forces (or disables) HTML rendering on the detail page, regardless of whether league/commonmark is installed:

MarkdownEditorField::new('content')->renderAsHtml(false); // always show raw Markdown

How it works

• The field renders a standard <textarea> whose configuration is exposed through data-* attributes.
• A small, framework-agnostic JavaScript module (loaded through AssetMapper) scans the page and initializes EasyMDE on each editor — the same self-contained approach EasyAdmin uses for its own Trix editor, so it does not require a Stimulus application to be running on the admin pages.
• The editor keeps the original <textarea> in sync so the form submits the Markdown source and EasyAdmin's "unsaved changes" detection keeps working.
• Required fields are validated client-side even though EasyMDE hides the original textarea.
• Markdown rendered on the detail page is sanitized (raw HTML is escaped and unsafe links are stripped) to prevent stored XSS.

Security

The Markdown rendered on the detail page is converted with league/commonmark configured with html_input: escape and allow_unsafe_links: false. Any HTML embedded in the Markdown source is escaped rather than executed.

Running the tests

composer install
vendor/bin/phpunit
vendor/bin/phpstan analyse
vendor/bin/php-cs-fixer fix --dry-run --diff

License

This bundle is released under the MIT license.