Register assets

CustomModule.php

<?php

class CustomModule extends CWebModule {

    private $assetsUrl;

    /**
     * Publish assets by copying files to public assets folder, 
     * accessable by clients.
     */
    public function publishAssets() {
        $this->assetsUrl = Yii::app()->getAssetManager()->publish(
            Yii::getPathOfAlias($this->getId() . '.assets'),
            false,
            -1,
            YII_DEBUG // Allways copy files when in debug mode
        );
    }

    /**
     * Register js and css files from assets
     *
     * @param string $file
     */
    public function registerFile($file) {
        if (empty($this->assetsUrl)) {
            $this->publishAssets();
        }

        if (strpos($file, '.js') !== false) {
            Yii::app()->clientScript->registerScriptFile($this->assetsUrl . '/js/' . $file, 
                CClientScript::POS_END);
        }
        else if (strpos($file, '.css') !== false) {
            Yii::app()->clientScript->registerCssFile($this->assetsUrl . '/css/' . $file);
        }

    }
}