tracks/app/views/todos/update.js.erb

<% if !@saved -%>
  TracksPages.show_edit_errors(html_for_error_messages());
<% else

  # jquery animations are async, so first collect all animation steps that need
  # to be run sequential,then execute them. All steps are functions which are
  # passed a function as parameter that will execute the next animation steps

  animation = []
  animation << "remove_todo" if update_needs_to_remove_todo_from_container
  if replace_with_updated_todo
    animation << "replace_todo"
  elsif append_updated_todo
    animation << (@new_context_created ? "insert_new_context_with_updated_todo" : "add_to_existing_container")
  end
  animation << "hide_context" if update_needs_to_hide_context
  animation << "highlight_updated_todo"
  animation << "update_empty_container" if source_view_is_one_of(:tag, :todo)
  animation << "update_predecessors"
%>

  <%= render_animation(animation) %>
  TracksPages.page_notify('notice', '<%=escape_javascript @status_message%>', 5);
  TracksPages.set_page_badge(<%= @down_count %>);
<% end %>

function remove_todo(next_steps) {
  $('#<%= dom_id(@todo) %>').fadeOut(400, function() {
    $('#<%= dom_id(@todo) %>').remove();
    <% if source_view_is :calendar 
         # in calendar view it is possible to have a todo twice on the page 
    -%>
         $('#<%= dom_id(@todo) %>').remove();
    <% end %>
    <%= show_empty_message_in_source_container -%>
    next_steps.go();
  });
}

function add_to_existing_container(next_steps) {
  $('#<%= item_container_id(@todo) %>').append(html_for_todo());
  <% if source_view_is_one_of(:project,:calendar) -%>
    next_steps.go();
    <% if (@target_context_count==1) || ( (@todo.deferred? || @todo.pending?) && @remaining_deferred_or_pending_count == 1) -%>
      $("#<%=  empty_container_msg_div_id %>").slideUp(100);
    <% end -%>
  <% else -%>
    <% unless (@todo_hidden_state_changed && @todo.hidden?) || @todo_was_deferred_from_active_state -%>
      $('#c<%= @todo.context_id %>').fadeIn(500, function() { 
        next_steps.go();
        <% if @target_context_count==1 -%>
          $("#<%=  empty_container_msg_div_id %>").slideUp(100);
        <% end -%>
      });
    <% else -%>
      next_steps.go();
      <% if (@target_context_count==1) || (@todo.deferred? && @remaining_deferred_or_pending_count == 1) || (@todo.hidden? && @remaining_hidden_count == 1) -%>
        $("#<%=  empty_container_msg_div_id %>").slideUp(100);
      <% end -%>
    <% end -%>
  <% end -%>
}

function replace_todo(next_steps) {
  $('#<%= dom_id(@todo) %>').html(html_for_todo());
  next_steps.go();
}

function hide_context(next_steps) {
  <% context_id = @context_changed ? @original_item_context_id : @todo.context_id -%>
  $('#c<%=  context_id %>').fadeOut(400, function(){ next_steps.go(); });
  <%= "$('#tickler-empty-nd').slideDown(400);" if source_view_is(:deferred) && @down_count == 0 %>
}

function highlight_updated_todo(next_steps) {
  $('#<%= dom_id(@todo)%>').effect('highlight', {}, 2000, function(){ });
  next_steps.go();
}

function update_empty_container(next_steps) {
  <% if @down_count==0 -%>
    $('#no_todos_in_view').slideDown(400, function(){ next_steps.go(); });
  <% else -%>
    $('#no_todos_in_view').fadeOut(100, function(){ next_steps.go(); });
  <% end -%>
}

function update_badge_count() {
  <%
    count = source_view_is(:context) ? @remaining_in_context : @down_count
    count = @project_changed ? @remaining_undone_in_project : count
  -%>
  TracksPages.set_page_badge(<%= count %>);
}

function insert_new_context_with_updated_todo(next_steps) {
  $('#display_box').prepend(html_for_new_context());
  $('#c<%= @todo.context_id %>').fadeIn(500, function() { next_steps.go(); });
}

function html_for_todo() {
  return "<%= @saved ? escape_javascript(render(:partial => @todo, :locals => { :parent_container_type => parent_container_type })) : "" %>";
}

function html_for_new_context() {
  return "<%= @saved && @new_context_created ? escape_javascript(render(:partial => @new_context, :locals => { :collapsible => true })) : "" %>";
}

function html_for_error_messages() {
  return "<%= escape_javascript(error_messages_for('todo')) %>";
}

function update_predecessors() {
  <% @todo.uncompleted_predecessors.each do |p| -%>
    if ($('#<%=item_container_id(p)%>')) {
      $('#<%=dom_id(p)%>').html('<%=escape_javascript(render(:partial => p, :locals => { :parent_container_type => parent_container_type }))%>');
    }
  <% end -%>
  <% if @removed_predecessors
    @removed_predecessors.each do |p| -%>
      if ($('#<%=item_container_id(p)%>')) {
        $('#<%=dom_id(p)%>').html('<%=escape_javascript(render(:partial => p, :locals => { :parent_container_type => parent_container_type }))%>');
      }
    <% end -%>
  <% end -%>
}