function hook_library

7.x system.api.php hook_library()

Registers JavaScript/CSS libraries associated with a module.

Modules implementing this return an array of arrays. The key to each sub-array is the machine readable name of the library. Each library may contain the following items:

  • 'title': The human readable name of the library.
  • 'website': The URL of the library's web site.
  • 'version': A string specifying the version of the library; intentionally not a float because a version like "1.2.3" is not a valid float. Use PHP's version_compare() to compare different versions.
  • 'js': An array of JavaScript elements; each element's key is used as $data argument, each element's value is used as $options array for drupal_add_js(). To add library-specific (not module-specific) JavaScript settings, the key may be skipped, the value must specify 'type' => 'setting', and the actual settings must be contained in a 'data' element of the value.
  • 'css': Like 'js', an array of CSS elements passed to drupal_add_css().
  • 'dependencies': An array of libraries that are required for a library. Each element is an array listing the module and name of another library. Note that all dependencies for each dependent library will also be added when this library is added.

Registered information for a library should contain re-usable data only. Module- or implementation-specific data and integration logic should be added separately.

Return value

An array defining libraries associated with a module.

See also




Related topics

6 functions implement hook_library()

Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

common_test_library in drupal/modules/simpletest/tests/common_test.module
Implements hook_library().
contextual_library in drupal/modules/contextual/contextual.module
Implements hook_library().
drupal_add_library in drupal/includes/
Adds multiple JavaScript or CSS files at the same time.
drupal_get_library in drupal/includes/
Retrieves information for a JavaScript/CSS library.
overlay_library in drupal/modules/overlay/overlay.module
Implements hook_library().

... See full list

1 invocation of hook_library()
drupal_get_library in drupal/includes/
Retrieves information for a JavaScript/CSS library.


drupal/modules/system/system.api.php, line 783
Hooks provided by Drupal core and the System module.


function hook_library() {
  // Library One.
  $libraries['library-1'] = array(
    'title' => 'Library One',
    'website' => '',
    'version' => '1.2',
    'js' => array(
      drupal_get_path('module', 'my_module') . '/library-1.js' => array(),
    'css' => array(
      drupal_get_path('module', 'my_module') . '/library-2.css' => array(
        'type' => 'file',
        'media' => 'screen',
  // Library Two.
  $libraries['library-2'] = array(
    'title' => 'Library Two',
    'website' => '',
    'version' => '3.1-beta1',
    'js' => array(
      // JavaScript settings may use the 'data' key.
        'type' => 'setting',
        'data' => array('library2' => TRUE),
    'dependencies' => array(
      // Require jQuery UI core by System module.
      array('system', 'ui'),
      // Require our other library.
      array('my_module', 'library-1'),
      // Require another library.
      array('other_module', 'library-3'),
  return $libraries;