How to Create Dynamic Fields in a Meta Box?

Question

Could someone explain me with a little example how create a button that creates a new custom field dynamically?

I'm working on a plugin and using add_meta_box, I need an input box (administration-side) and a button that when clicked will create a new input box, after saving the previous data (on a custom database).

Answer 1

You are looking for Repeatable Fields.

Here in WPSE, it was covered in the following Q&A:
Custom Meta Boxes: Store two values in one repeatable field

A Gist:
https://gist.github.com/2057532

Class helpers for building the plugin options page:

• Option Panel Class ^{(from Bainternet, one of the house moderators)}
• WPAlchemy_MetaBox PHP class