I know that drupal_add_css is depreciated, and that we should use #attached instead to attach a css style sheet to a module.

I am trying to replace the following (which works):

drupal_add_css(drupal_get_path('module', 'mymodule') .'/mymodule.css');

with #attached. But haven't found exactly where and how to add it.

Here is my second attempt (it still does not work):

 * Implementation of hook_block_view()
function mymodule_block_view($delta = '') {
  if ('mymodule' == $delta) {
    $render = array();
    $list = mymodule_fetch_from_info();
    foreach ($list as $element) {
      $render[] = array(
        '#type' => 'markup',
        '#markup' => $element[0],
        '#weight' => $element[1],
    $blocks['subject'] = t('Mymodule');
    $blocks['content'] = $render;
    $blocks['#attached'] = array (
      'css' => array(
        drupal_get_path('module', 'mymodule') . '/mymodule.css',
    return $blocks;

1 Answer 1


You cannot use #attached inside your hook_theme implementation. Instead, you should add it when you're building a render array:

$blocks['content'] = $render;
$blocks['content']['#attached'] = array (
  'css' => array(
    drupal_get_path('module', 'mymodule') . '/mymodule.css',

As kiamlaluno already pointed out in the comments, in your code example $blocks['content'] is the render array, so the #attached element must be part of that array.

  • $blocks is not a render array, but $blocks['content'] is.
    – apaderno
    Commented Apr 18, 2015 at 20:28

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