..tip::

Be sure that ``swiftmailer`` entry appears in your application

configuration. Asyou mentioned in:ref:`service-container-extension-configuration`,

Be sure thatthe``swiftmailer`` entry appears in your application

configuration. Aswas mentioned in:ref:`service-container-extension-configuration`,

the ``swiftmailer`` key invokes the service extension from the

``SwiftmailerBundle``, which registers the ``mailer`` service.

Allowing the user to dynamically add new tags means that you'll need to

use some JavaScript. Previously you added two tags to your form in the controller.

Nowtolet the user add as many tag forms as he needs directly in the browser.

Now let the user add as many tag forms as he needs directly in the browser.

This will be done through a bit of JavaScript.

The first thing you need to do is to let the form collection know that it will

<label for="{{ form.name.vars.id }}"

class="{{ form.name.vars.required ? 'required' : '' }}">

{{ form.name.label }}

{{ form.name.vars.label }}

</label>

..code-block::html+php