In Drupal 7, you can put the following code in template.php to add the class 'vr-paragraphs' to the field called 'field_title'

function THEMENAME_form_alter(&$form, &$form_state, $form_id) {
       $form['field_title']['#attributes']['class'][] = 'vr-paragraphs';

How can I modify this code to target all fields on the form and not just 'field_title'.

Also, this code only adds the class to the form-wrapper part of the filed. How can I alter the label part?

Thanks for any help!

2 Answers 2


When you need to find the child items present in a form, you need to use element_children(), as Drupal functions like filter_process_format() do.

The reason is simple: In a Drupal form array, as well as in a render array, not all the keys are child items; those keys with a name that starts with # are properties. Consider, for example, the form returned from forum_form_forum(); if you loop through it with the following code, you would add values where you should not.

foreach($form as $key => $value) {
  $form[$key]['#attributes']['class'][] = 'vr-paragraphs';

In fact, $form['#submit'] is not a child item, nor is $form['#theme']. In particular, when your code will be executed for the last key, you would get a PHP error. $form['#theme'] is a string, and $form['#theme']['#attributes'] would select a character of that string, supposing that '#attributes' would be evaluated as the integer 0; even in that case, $form['#theme']['#attributes']['class'][] would not be a valid PHP construct.

The correct code would be the following one.

foreach(element_children($form) as $key) {
  $form[$key]['#attributes']['class'][] = 'vr-paragraphs';

Implement a for loop over each form field to add the class. eg.

foreach(form as $key => $value){
  $form[$key]['#attributes']['class'][] = 'vr-paragraphs';

You may have to check if it is actually a field though, maybe by checking if $form[$key]['#title'] is set.

If I remember correctly, the label is usually taken from the '#title' of the field.

  • Thanks for your help. This is what I have tried: function THEMENAME_form_alter(&$form, &$form_state, $form_id) { foreach(form as $key => $value){ $form[$key]['#attributes']['class'][] = 'vr-paragraphs'; } } But it doesn't seem to work. Am I doing something wrong?
    – big_smile
    Feb 9, 2013 at 16:41
  • The answer posted by kiamlaluno should work, use that.
    – 2pha
    Feb 10, 2013 at 3:54

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