There's a div called .description in a form in the site I've inherited. I want to add a another class to the div.

The div's content is created within hook_form_FORM_ID_alter(), eg:

$form['#description'] = 'Please enter your full name';

I've tried adding a classed to it like:

$form['#description'] = [
    '#markup' => '<div class="my-class">Please enter your full name</div>',

But this just results in "Array" being printed.

Would anyone know what I could do add a class to this element?

  • Why did you add an 's' in the second example? #description is not an element, its the description text - in this case it would be for the form itself. Does that text appear at the top of the form and not attached to anything?
    – Kevin
    Commented Nov 20, 2017 at 0:34
  • @Kevin, oops typo. The text appears at the bottom of the form, but still within the form element, wrapped in it's own div <div class="description">Please enter your full name</a>. (I don't know where the description class is coming from.)
    – MeltingDog
    Commented Nov 20, 2017 at 0:36

1 Answer 1


That's not what you want. What you want to do is add it to the form structure like this:

$form['#attributes']['class'][] = 'my-class';

Since you didn't list an element on the form, I can only assume you want the class on the form itself. If you want to wrap an element with a div with a class on it, you can do:

$form['element']['#prefix'] = '<div class="my-class">';
$form['element']['#suffix'] = '</div>';

That will wrap the entire element.

  • Thanks, yes this adds the class to the wrapping <form> element, but I want to target the div element within that form element.
    – MeltingDog
    Commented Nov 20, 2017 at 0:38
  • That comes from the core theming function theme_form_element: cgit.drupalcode.org/drupal/tree/includes/form.inc?h=7.x#n4261 it is hardcoded there. To get around that, you would need to change the theme wrapper for this element to point to a custom one or add JS to add the class on (not preferable). I am not sure if there is a contrib module to help this, I don't know of one off the top of my head.
    – Kevin
    Commented Nov 20, 2017 at 0:43
  • Barring any overrides of this theming function, this div will appear for any element that has a #description key.
    – Kevin
    Commented Nov 20, 2017 at 0:46

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