Hi Alex,
>
> However, I would like the last option to be "Add new..."
> and then a box would pop up allowing the user to enter a
> new value.
>
> Now I've got all the JavaScript and the Rails code to allow
> the user to enter a new option, the problem is how do I add
> the last alternative ("Add new...") to my select box?
Assuming that the action that adds the new option creates a new record in
the db and that you're rendering a partial to display the select in the
first place (if not, refactor), just add a find to your action and re-render
the select via RJS.
HTH,
Bill
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