Select_tag question

Rails
1

How can I use select_tag to

  1. Have a prompt like “Select a Value” ( selected by default )

I tried this but did not work:

<%= select_tag :current_course,
options_for_select( Course.find(:all).map {|p|
[p.title,p.id]} ),
{ :prompt => “Select a Value” }
%>

  1. Generate a ‘selected’ event so that some action can be done like
    submit the form or refresh the page?

Thanks in advance

  • AJ