There are times as a Joomla extension developer when it would be very useful to have a form field in Joomla that is capable of self-replication. For example, you want your user to be able to input some links, but you don't know in advance how many there will be, you want your user to be able to choose to add as many as they want without imposing any arbitrary limit. What you want is a self-replication form field that can return its values as an array.
Well now you can have one. We have designed a system of self-replicating form fields for Joomla extensions. The variable field form field can be used to generate self-replicating fields of most of the Joomla standard field types, including text, textarea, list and other list based types, such as category or usergroup. The user will see the standard input field, plus buttons which allow the user to add or delete input fields, also to re-order them, also to re-order them up and down.