For showing the categories in drop down menu just use the following code.


<li id="categories"><h2><?php _e('Posts by Category'); ?></h2>
 <?php wp_dropdown_categories('show_option_none=Select category'); ?>

<script type="text/javascript"><!--
 var dropdown = document.getElementById("cat");
 function onCatChange() {
 if ( dropdown.options[dropdown.selectedIndex].value > 0 ) {
 location.href = "<?php echo get_option('home');
?>/?cat="+dropdown.options[dropdown.selectedIndex].value;
 }
 }
 dropdown.onchange = onCatChange;
--></script>
</li>

For more information you can use the following code.

Written by Purab Kharat

I Purab am from India, Pune. I am WordPress and Drupal Architect and consultant. I worked on many technologies like Ruby on Rails, Flex, PHP, jQuery etc... Senior Technical Lead at Smartsourcing Global Pvt Ltd in Princeton, NJ, USA.I contributed to many wordpress plugins and Drupal Modules. I contributed to Drupal core also.Connect to purab on LinkedIn or Follow @purab on Twitter or Follow me on Google+ or Write Mail to purabdk@gmail.com or Chat with me on Skype : purabdk

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