sevenspark

<a href="http://wpmegamenu.com/responsive-select-menu/" rel="nofollow ugc">View Demo 1</a>
<a href="http://agility.sevenspark.com/responsive-select-menu" rel="nofollow ugc">View Demo 2 in a Responsive WordPress Theme</a>
One common UI paradigm for navigation menus with responsive design is to display a select box (form element) 
for mobile devices. This plugin allows you to turn your WordPress 3 menu into a select box below a width of your choice.
<h4>Features</h4>
<ul>
<li>Takes up less screen real estate on mobile devices</li>
<li>Easier navigation for touch screens</li>
<li>Works automatically – no need to add extra PHP code</li>
</ul>
<h4>Highly Configurable</h4>
Through the Responsive Select Menu Control Panel you can:
<ul>
<li>New in 1.2 – select which theme locations to apply the menu to </li>
<li>Set your width breakpoint (where your menu switches from your standard menu to a select box)</li>
<li>Configure how many levels you wish to include in the select menu. Set it to 1 to include only the top-level menu items.</li>
<li>Choose the character used to indent your submenu items within the select box</li>
<li>Choose whether or not to exclude “dummy” items that don’t have links</li>
<li>Set the text of the first menu item</li>
</ul>
The demo is built with <a href="http://wpmegamenu.com/" rel="nofollow ugc">UberMenu – WordPress Mega Menu Plugin</a> , but it is designed to work with any UL-based WordPress 3 menu.
Based on the excellent tutorial from <a href="http://css-tricks.com/convert-menu-to-dropdown/" rel="nofollow ugc">Chris Coyier and CSS Tricks</a> – thanks!

Responsive Select Menu

The Responsive Select Menu plugin automatically turns any WordPress 3 Menu into a select box / dropdown on mobile devices.

peterjharrison

This plugin makes it easy to have chain select category/custom taxonomy drop downs in your theme using Ajax.
The plugin was created as a way for me to use chain selects on a number of websites I have built over the past few 
years. As it was my first attempt at making a WordPress plugin, I thought it would be best to go back and update it to work with the latest version of WordPress and is now compatible with custom taxonomies.
Feel free to visit my website www.peterjharrison.me or contact me at 
me@peterjharrison.me
Have fun!

Responsive Select Menu vs Category Ajax Chain Selects