Editable Combo Box

Rails has exactly the same form elements as every other web based
application. So the direct answer is no, because web forms don't
provided them.

However, you're in luck! Rails has excellent support for AJAX through
Prototype, which has an auto-completing text field, which should give
you what you want. Maybe even better than what you want. And don't
fret, it's pretty easy to use.

The only down side is that your page will then require JavaScript, so
you'll either need to require JavaScript for your application or make
sure your form will still function reasonably well without JavaScript.

There are several comboboxes around, one in Ext JS at http://extjs.com/ (which is compatible with Prototype/scriptaculous nowadays).

Best regards

Peter De Berdt

Right, I figured some would be available, It's just, unfortunately,
not a standard HTML form element, so it would need to be done using
AJAX/JS/DHTML style components.