gistfile1.txt

<tr>
  <td>
    <%= check_box_tag "completed", t.id, t.completed, :class => "completed" %>
  </td>
  <td><%= t.task_type %></td>
  <td><%= link_to "#{truncate(t.subject, :length => 20)}", admin_task_path(t) %></td>
  <td><%= t.responsible(&:name) %></td>
  <td><%= link_to t.client, admin_client_path(t.client) unless t.client.nil? %></td>
  <td><%= t.deadline.strftime("%d/%m/%y %H:%M") %></td>
  <td><%= t.author(&:name) %></td>
  <td>
    <a data-toggle="modal" href="#editTask<%= t.id %>"><%= image_tag "edit.png" %></a>
    <a data-toggle="modal" href="#deleteTask<%= t.id %>"><%= image_tag "delete.png" %></a>
  </td>
</tr>

<script>
$(".completed").live("change", function('<%= t %>') {
  $.ajax({
    url: "/admin/tasks/completed",
    beforeSend: function() { alert("Hi"+'<%= t %>') },
    data: "id="+'<%= t %>', 
    success: function() { alert('Bye') }
  });
});
</script>