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Add CSS class to drupal form fieldset

Tested on:

Drupal x
Zen custom subtheme

Customizing Drupal form appearance may sound difficult. But to add a CSS class is (surprisingly!) simple using theme_fieldset themeable function.

theme_fieldset

Copy theme_fieldset code from Drupal manual page
Paste to your template.php:

* If you’re using a Zen theme, change theme_fieldset to zen_fieldset. You can try to use this method with your theme prefix.

* If you’re using a theme based on phptemplate engine, you can change theme_fieldset to zen_fieldset to have the same effect of above (try one of this, not both).

Change the resultant code as you wish.

I’ve attached an example to generate CSS class from fieldset title: Add CSS class to drupal form fieldset.

Add CSS class to drupal form fieldset

\# custom fieldset CSS class from element \#title

$css_class = “my-custom-class-“;

$css_class .= str_replace(” “,”-“,strtolower($element\[‘#title’\]));

\# using transliteration module to transliterate/strip non-ASCII character where available

if(module_exists(‘transliteration’)){

\# including Transliteration functions

require_once(drupal_get_path(‘module’, ‘transliteration’) .’/transliteration.inc’);

$css_class = transliteration_clean_filename($css_class);

}

Adding this code to your template:

Take all Drupal generated fieldset title

* e.g. “Impostazioni del menù”

Transform it in a CSS class using Transliteration module

* e.g. “my-custom-class-impostazioni-del-menu”

Queue it with other CSS classes (where available)

* e.g “collapsible my-custom-class-impostazioni-del-menu”

I apply a previous substitution of whitespace using “-” (transliteration module use underscore “\_”) and you can do the same, but later remember to use transliteration_clean_filename to safely sanitize class name for any other case you’ve not contemplated (accents, special characters).

https://web.archive.org/web/20080317000000*/http://api.drupal.org/api/function/theme_fieldset/5

https://web.archive.org/web/20080317000000*/http://drupal.org/phptemplate