I am in the process of creating a new type of Custom Field. (Joomla 3.9x)

As a new Field under Plugin.

I need to have a confirm-dialog on beforeSave, but I can't find any proper tutorial on how to do that.

How do I implement a javascript confirm in a Field-plugin

defined('_JEXEC') or die;

JLoader::import('components.com_fields.libraries.fieldsplugin', JPATH_ADMINISTRATOR);

class PlgFieldsintorder extends FieldsPlugin
    public function onContentBeforeSave($context, $item, $isNew, $data = array())
        // pseudocode:
        // if (window.confirm("Do you really want to set this value?")) { 
            // do something in php/sql;
        // }

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