Load CKEditor manually

If you want to control the CKEditor loading, you can configure the bundle to not load the library at all and let you the control of it. To disable the CKEditor library loading, you can do it globally in your configuration:

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# app/config/config.yml
fos_ck_editor:
    autoload: false

Or you can disable it in your widget:

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$builder->add('field', 'ckeditor', array('autoload' => false));

Load CKEditor asynchronously

If you want to load CKEditor at the bottom of your page, the best way is to still disable the CKEditor loading (in order to let you load CKEditor at the bottom of the page only one time) but also to configure the bundle to render the javascript latter with a dedicated function shipped in a third party bundle named IvoryFormExtraBundle.

So, first you need configure the bundle. You can do it globally in your configuration:

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# app/config/config.yml
fos_ck_editor:
    autoload: false
    async: true

Or you can configure it in your widget:

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$builder->add('field', 'ckeditor', array(
    'autoload' => false,
    'async'    => true,
));

Then, install the third party bundles as explained in its documentation.

Finally, in your Twig template, you can render the form javascript with:

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{{ form_javascript(form) }}

Or if you use the PHP templating engine:

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<?php echo $view['ivory_form_extra']->javascript($form) ?>