Rails: Form confirm message with data from the submitted form

Question

Trying to make a custom :confirm message for a rails form that returns data from the submitted form--not just a static string.

<% form_for @foo do |f| -%>
<% f.text_field :number_of_bars -%>
<% f.submit :confirm => Are you really sure you want to use ##number_of_bars## bars? -%>

The idea is if the user puts in the number 3 in the number of bars text field the confirm message would show up like this: "Are you really sure you want to use 3 bars?"

Any ideas how to do this?

Answer 1

Try this:

<%= f.submit :onclick => "return confirm('Are you really sure you want to use '+
          document.getElementById('number_of_bars_id').value + '?' )" %>

Replace the number_of_bars_id with the id of your field.

If you google a bit you will find a way for this to work with :confirm.