Rails - May 2012 - how to use oncomplete in Rails-3.2.1 Ajax

I''m using Rails-3.2.1 and working on ajax.

Below is my code and I want to add woking in progress msg while my
function is in progress.

=====================================================================example.html.erb
file

<div id="showmsg">
    Once you approve it will publish.
&nbsp;

<span id="status_section">
[&nbsp;
<%= link_to "Approve", {:action=>"approve_status",
:id=>params[:id],
:stat=>"approved"}, :remote=>true %>
&nbsp; | &nbsp;
<%= link_to "Reject", {:action=>"approve_status",
:id=>params[:id],
:stat=>"rejected"}, :remote=>true %>
&nbsp;]
</span>

</div>
=====================================================================controller
method

def approve_status
    @camp_id = params[:id]
    @camp_stat = params[:stat]

    @campaign = Campaign.find_by_id(@camp_id)
    @campaign.approved_status = @camp_stat
  end

=====================================================================example.js.erb
file

jQuery.noConflict();
jQuery("#showmsg").hide();
jQuery("#app_stat").html("<%= @camp_stat %>");
=====================================================================
How to use ajax complete or success in this?

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