Rails select_tag with ajax action

Question

I have the following select list.

<%= select_tag(:editlevel,options_from_collection_for_select(Level.all, :id, :name)) %>
when the user selects an option from the above list, the list below should be populated with values from database based on the above selection.

<%= select_tag(:lques,{},{ :size =>10, :style => "width:200px"}) %>

i think i should make use of a remote_function with the onchange event. but i have no idea on how to use it. and populate the latter list the values from the database. someone help me please.

thanks in advance.

Answer 1

a simple way that i solved this was

<select id="editlevel" name="editlevel" onchange="
   <%= remote_function(
           :update => 'lques', 
           :url => {:action => :lques}, 
           :with => "'level=' + $('editlevel').value %>
">

</select>

<select id="lques" name="lques">
</select>

then your lques action can just get what lques records you need and do a options_for_select and it should just put what comes back from the server as $('lques').innerHTML

this is air code, not tested