jQuery ReSmenu is a very simple and lightweight (~1Kb) jQuery plugin that collapse <ul> menus into <select> on responsive layouts.

Download it on GitHub

To use it you just have to include jQuery and a copy of the plugin in your head or footer:

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript" src="jquery.resmenu.min.js"></script>

Let’s say this is your menu:

<div class="menu_container">
    <ul class="toresponsive">
        <li><a href="/">Home</a></li>
        <li class="current-menu-item"><a href="test.htm">Link</a></li>
        <li><a href="test.htm">Link 2</a></li>
        <li><a href="test.htm">Link 3</a></li>
        <li><a href="test.htm">Link 4</a></li>

Now the only thing to do is to trigger the menu with:

$(document).ready(function () {

If you need more control here’s the plugin settings:

    menuClass:    'responsive_menu',   // Responsive menu class
    selectId:     'resmenu',          // select ID
    textBefore:   false,               // Text to add before the mobile menu
    selectOption: false,               // First select option
    activeClass:  'current-menu-item', // Active menu li class
    maxWidth:     480                  // Size to which the menu is responsive

Some examples

Example A – No options



Example B – Collapse at 720px wide


    maxWidth: 720

Example C – Menu with label


    textBefore: 'Choose:'

Example D – Menu with first option

The active li won’t be highlighted



    selectOption: 'Choose:'

Some css

ReSmenu runs out of the box but if you want to style your select to better fit the container you can take advantage of the short css style taken from twitter bootstrap:

.responsive_menu select {
    display: block;
    width: 100%;
    height: 36px;
    padding: 6px 12px;
    font-size: 14px;
    line-height: 1.42857;
    color: rgb(85, 85, 85);
    vertical-align: middle;
    background-color: rgb(255, 255, 255);
    background-image: none;
    border: none;