Load Stimulus Controllers in Symfony EasyAdmin

I had the use case to enable drag and drop sorting in an EasyAdmin user interface. I want to reuse stimulus controllers I already coded on the Crud index page and take advantage of the simplicity of the Asset Mapper component.

Install Symfony and EasyAdmin

composer create-project symfony/skeleton:"7.2.x" my_project_directory
cd my_project_directory
composer require webapp

composer require easycorp/easyadmin-bundle

Boot Stimulus in the Admin

In order to dynamically load the Stimulus controller as you are used to, we must first create an entry point:

Path: assets/admin.js

import './bootstrap.js';

Add admin.js as entrypoint to your importmap.php in the project root

return [
    'app' => [
        'path' => './assets/app.js',
        'entrypoint' => true,
    ],
    'admin' => [
        'path' => './assets/admin.js',
        'entrypoint' => true,
    ],

Now we need to load the import map globally in EasyAdmin by overriding the EasyAdmin layout template:

Path: templates/bundles/EasyAdminBundle/layout.html.twig

{% extends '@!EasyAdmin/layout.html.twig' %}
{% block importmap %}
    {{ parent() }}
    {{ importmap('admin') }}
{% endblock %}

That’s it, now you can use all your Stimulus controllers in EasyAdmin!

Use a Stimulus Controller on a Crud index page

I use this Stimulus controller to enable sorting for a Crud Entity:

Path: assets/controllers/sortable_controller.js

import { Controller } from '@hotwired/stimulus';
import Sortable from 'sortablejs';

export default class extends Controller {
    static values = {
        url: String
    }

    connect() {
        if (!this.element) return;
        const tbody = this.element.querySelector('tbody');
        if (!tbody) return;

        new Sortable(tbody, {
            animation: 150,
            handle: '.drag-handle',
            onEnd: this.onEnd.bind(this)
        });
    }

    onEnd(event) {
        const itemId = event.item.dataset.id;
        const newPosition = event.newIndex + 1;
        const oldPosition = event.oldIndex + 1;

        fetch(this.urlValue.replace('{id}', itemId), {
            method: 'POST'…