Font & Text preview

Hi,

Does anyone know if there’s a way to have a text & font preview window for users like you get on some font search sites such as here on dafont.com or on http://www.aringtypeface.com/recorda-script/
where you get a preview of the text you’re typing.
I would like to get users to fill in a text in a box (it’s an shop we’re you get to print custom labels) and they see the result in the chosen font.
Ideally, in a later version i would also like to get it in a curved text as my labels are ellipses. I can’t show you the site yet, as it’s far from ready.

Thank you!

Jonathan