/**
     * Method to create field's HTML display for item form
     * @param stdClass $field
     * @param stdClass $item
     */
    public function onDisplayField(&$field, &$item)
    {
        parent::onDisplayField($field, $item);
        /*
         * Naprawiono opcje usuwania ilustracji
         */
        \JFactory::getDocument()->addScriptDeclaration('jQuery(document).ready(function($) {
            $(".container_fcfield").on("change", "input.imgremove[type=\\"checkbox\\"]", function() {
                var $this = $(this),
                    container = $this.closest(".container_fcfield"),
                    existingname = container.find("input.existingname").eq(0);

                if ($this.is(":checked")) {
                    existingname.data("old_value", existingname.val());
                    existingname.val("");
                } else {
                    existingname.val(existingname.data("old_value"));
                    existingname.data("old_value", "");
                }
            });
        });');
    }