function hook_ckeditor_css_alter

hook_ckeditor_css_alter(array &$css, Editor $editor)

Modify the list of CSS files that will be added to a CKEditor instance.

Modules may use this hook to provide their own custom CSS file without providing a CKEditor plugin. This list of CSS files is only used in the iframe versions of CKEditor.

Front-end themes (and base themes) can easily specify CSS files to be used in iframe instances of CKEditor through an entry in their .info.yml file:

ckeditor_stylesheets:
  - css/ckeditor-iframe.css

Parameters

array &$css: An array of CSS files, passed by reference. This is a flat list of file paths which can be either relative to the Drupal root or external URLs.

$editor: The text editor object as returned by editor_load(), for which these files are being loaded. Based on this information, it is possible to load the corresponding text format object.

See also

_ckeditor_theme_css()

Related topics

Hooks

Define functions that alter the behavior of Drupal core.

File

core/modules/ckeditor/ckeditor.api.php, line 55

Documentation for CKEditor module APIs.

Code

function hook_ckeditor_css_alter(array &$css, Editor $editor) {
  $css[] = drupal_get_path('module', 'mymodule') . '/css/mymodule-ckeditor.css';
}