// Add partial to the top container.
jQuery("#top").prepend("<%= j (render partial: 'block',
                                                locals: { user: @user,
                                                          block_name: @block
                                                        }) %>");

// Revert options selection back to the default one.
jQuery('#block-options option[value="--<%= t(:button_add) %>--"]').prop('selected', true);

// Disable the option for this block in the blocks-to-add-to-page dropdown.
jQuery('#block-options option[value="<%= @block %>"]').attr("disabled", "true");