tracks/app/views/contexts/edit.js.erb

<%- object_name = unique_object_name_for("edit_context_#{@context.id}") %>

var <%=object_name%> = {
  animate: function() {
    <%=object_name%>.replace_context_with_edit_form();
  },
  replace_context_with_edit_form: function() {
    $('div#<%=dom_id(@context)%>').fadeOut(250, function() {
      <%=object_name%>.show_edit_form();
      <%=object_name%>.set_focus();
    });
  },
  show_edit_form: function() {
    $('div#<%=dom_id(@context, 'edit')%>').html(<%=object_name%>.html_for_edit_form());
    $('div#<%=dom_id(@context, 'edit')%>').fadeIn(500);
  },
  set_focus: function() {
    $('input.context-name').focus();
  },
  html_for_edit_form: function() {
    return "<%= js_render('context_form', {}, @context) %>";
  }
};

<%= object_name %>.animate();