Category Field Guide
The category form field provides a drop down list of categories (only published or all) for a certain extension.
Field Settings
Joomla Extension: This is required. It is the name of the extension for which the categories will be retrieved. For example, to list content categories, use the value "com_content".
Published: Enable this setting to retrieve only published categories.
Header: This is the first option in the drop down list. For example, you can enter "- Select -".
Form Layout: Choose the layout that will be used to render the field.
On Change: The onchange event to run JavaScript code when the value changes.