_expander.html.erb

<% add_app_component_stylesheet("expander") %>
<%
  title ||= false
  open_on_load ||= false
  margin_bottom ||= 0

  content_id = "expander-content-#{SecureRandom.hex(4)}"
  shared_helper = GovukPublishingComponents::Presenters::SharedHelper.new(local_assigns)

  component_helper = GovukPublishingComponents::Presenters::ComponentWrapperHelper.new(local_assigns)
  component_helper.add_data_attribute({ module: "expander" })
  component_helper.add_data_attribute({ "open-on-load": open_on_load })
  component_helper.add_class("app-c-expander")
  component_helper.add_class(shared_helper.get_margin_bottom) unless margin_bottom == 0
  component_helper.add_data_attribute({ "button-data-attributes": button_data_attributes }) if local_assigns.include?(:button_data_attributes)
%>
<% if title %>
  <%= tag.div(**component_helper.all_attributes) do %>
    <h3 class="app-c-expander__heading">
      <span class="app-c-expander__title js-toggle"><%= title %></span>
      <svg version="1.1" viewBox="0 0 1024 1024" xmlns="http://www.w3.org/2000/svg" width="0" height="0" class="app-c-expander__icon app-c-expander__icon--up" aria-hidden="true" focusable="false"><path d="m798.16 609.84l-256-256c-16.683-16.683-43.691-16.683-60.331 0l-256 256c-16.683 16.683-16.683 43.691 0 60.331s43.691 16.683 60.331 0l225.84-225.84 225.84 225.84c16.683 16.683 43.691 16.683 60.331 0s16.683-43.691 0-60.331z"/></svg>
      <svg version="1.1" viewBox="0 0 1024 1024" xmlns="http://www.w3.org/2000/svg" width="0" height="0" class="app-c-expander__icon app-c-expander__icon--down" aria-hidden="true" focusable="false"><path d="m225.84 414.16l256 256c16.683 16.683 43.691 16.683 60.331 0l256-256c16.683-16.683 16.683-43.691 0-60.331s-43.691-16.683-60.331 0l-225.84 225.84-225.84-225.84c-16.683-16.683-43.691-16.683-60.331 0s-16.683 43.691 0 60.331z"/></svg>
    </h3>
    <div class="app-c-expander__content js-content <%= 'app-c-expander__content--visible' if open_on_load %>" id="<%= content_id %>">
      <%= yield %>
    </div>
  <% end %>
<% end %>