Config in symfony to use it in the form

Your collection container should have the prototype mentioned in the symfony documentation, and an id or a class. So in your form type:

$builder->add('collectionProperty',   CollectionType::class, [
                ...
                'prototype' => true,
                'by_reference' => false,
                'attr' => array(
                    'class' => 'collection',
                    ),
                ...
            ]);

Then on the client side, include the library either with a package manager or with a cdn, and use the function like in the demo

Tags: getting_started