Symfony FormBuilder - custom option for additional element?

Question

I've only recently started using Symfony (Symfony3) and I'm in the process of converting my old website to use Symfony. Currently with my form elements I have the addition of a validation error message element, plus a help/information element (an info symbol that shows the text on clicking).

<div id="info-username" class="additional-info">
    <p>Your username will be used as a way of <em>uniquely</em> identifying you when you log into your account. You can still log in using your email address in case you forget your username.</p>
    <p>It must be between 2-25 characters long and start with a letter. The following characters are permitted: letter, number, dot, underscore, dash.</p>
</div>

Symfony handles the validation error message element as standard but I can't see a way of easily adding extra info text. Ideally I would like this as an extra option I can then pass to the 'add' method of the FormBuilder. E.g.

->add('username', TextType::class, array(
    'info' => '<p>Your username will be used as a way of <em>uniquely</em> identifying you when you log into your account. You can still log in using your email address in case you forget your username.</p>
<p>It must be between 2-25 characters long and start with a letter. The following characters are permitted: letter, number, dot, underscore, dash.</p>'
)

Is that possible? Rather than adding it directly in my twig templates.

Answer 1

Try the following :

->add('username', TextType::class, array(
    'help' => '<p>Your username will be used as a way of <em>uniquely</em> identifying you when you log into your account. You can still log in using your email address in case you forget your username.</p>
<p>It must be between 2-25 characters long and start with a letter. The following characters are permitted: letter, number, dot, underscore, dash.</p>'
)

If it doesn't work on this field type, look at the following form extension