css - How do you limit the number of items on show in the bootstrap btn-dropdowns -

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i making search bar bootstrap , 1 of elements category list. problem @ moment when press category button shows every single category in list @ same time - making ui awful! how can limit number of concurrent options on show?

this example of problem:

enter image description here

for example might want show first 5 options , have scroll bar rest?

this markup used create have far:

<form class="navbar-form" role="search" action="/search" method="get">     <div class="input-group">         <input type="text" class="form-control" placeholder="search event" name="q" id="q">         <div class="input-group-btn">         <div class="btn-group" role="group"> <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false">   dropdown   <span class="caret"></span> </button> <ul class="dropdown-menu" role="menu"> <% @categories.each |category| %> <% category.sub_categories.each |sub_category| %> <li><a href="#"><%= sub_category.name %></a></li> <% end %> <% end %> </ul>

a fiddle working try show problem can found here: http://jsfiddle.net/c7vculsa/2/

why not add overflow ul?

http://jsfiddle.net/0lmjppsz/1/

.menu-scroll {   overflow-y: scroll;   max-height: 200px; }

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