<%= context_menu id => 'my-context-menu', items => [
            ['Item 1', ['item1'] ],
            ['Item 2', ['item2'] ],
            [],
            ['Item 3', ['item3'] ]
         ] %>
</div>
<ul class="dropdown-menu" id="my-context-menu">
    <li><a class="menuitem" href="item1" tabindex="-1">Item 1</a></li>
    <li><a class="menuitem" href="item2" tabindex="-1">Item 2</a></li>
    <li class="divider"></li>
    <li><a class="menuitem" href="item3" tabindex="-1">Item 3</a></li>
</ul>