javascript - Twitter Bootstrap top menu unknown component slides down -

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i'm using twitter bootstrap , i'm having problem top-bar menu. when choose item dropdowns, events fired correctly, javascript ok, there visual (a div probably?) slides down , disappears. looks this:

ugly sliding-down bug image

i'm not twitter bootstrap expert, expect i've got invalid html put there. entire html code available here: https://github.com/pateketrueke/json-schema-faker/blob/gh-pages/src/index.html, important part this:

<body>     <!-- fixed navbar -->     <nav class="navbar navbar-default navbar-fixed-top">         <div class="container">             [...]             <div id="navbar" class="navbar-collapse collapse">                 <ul class="nav navbar-nav">                     <li class="dropdown">                         <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">samples <span class="caret"></span></a>                         <ul class="dropdown-menu" role="menu">                             <li class="dropdown-header">faker.js</li>                             <li><a href="#" id="example_faker" data-toggle="collapse" data-target=".navbar-collapse">faker example</a></li>                             <li class="divider"></li>                             <li class="dropdown-header">chance.js</li>                             <li><a href="#" id="example_chance" data-toggle="collapse" data-target=".navbar-collapse">chance example</a></li>                             <li class="divider"></li>                             <li class="dropdown-header">other</li>                             <li><a href="#" id="example_boolean" data-toggle="collapse" data-target=".navbar-collapse">boolean</a></li>                             <li><a href="#" id="example_integer" data-toggle="collapse" data-target=".navbar-collapse">integer</a></li>                             <li><a href="#" id="example_array" data-toggle="collapse" data-target=".navbar-collapse">array</a></li>                         </ul>                     </li>

the question is: can remove "sliding-down-and-disappearing-thing" bug?

edit

this app supports mobile version well. looks this:

mobile version mainpage image

when touch top right hand nav button, menu appears:

mobile version mainmenu image

now when click samples, submenu appears:

mobile version samples submenu image

and when click of options, menus hide (collapse), see demo immediately.

now mobile works intended :). , i'd non-mobile-sliding-bug solution not ot break mobile version.

<div id="navbar" class="navbar-collapse collapse">

remove 2 css classes.

this 2 classes supposed works dropdown system. dropdown system try weird div , doesn't works.


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