Hi,
If you open your browser inspector/console ; you will see that you have a javascript error in your page.
Uncaught TypeError: undefined is not a function
For the code:
jQuery(document).ready(function (){
jQuery('select').chosen({"disable_search_threshold":10,"allow_single_deselect":true,"placeholder_text_multiple":"Select some options","placeholder_text_single":"Select an option","no_results_text":"No results match"});
});
Due to that error, the rest of the javascript is not process, like the function "hikashopUpdateVariant" which is define just after the line where you have a JS error. So when you modify the dropdown, the code can't be processed.
Chosen is provided by Joomla itself so HikaShop should be able to use it because the lib is in Joomla itself.
The real error beside is in your template which does not load the javascript in the HTML head but which put all javascript inclusions in a special "scriptloader"
<script src="/media/zen/js/tools/scriptloader.min.js" type="text/javascript"></script>
<script type="text/javascript">loadScript('/media/system/js/mootools-core.js','',function(){loadScript('/media/system/js/mootools-more.js','',function(){loadScript('/media/system/js/core.js','',function(){loadScript('/media/system/js/modal.js','',function(){loadScript('//code.jquery.com/jquery-1.8.3.min.js','/media/zen/js/jquery/jquery-1.8.2.min.js',function(){loadScript('/media/zen/js/jquery/jquery-noconflict.js','',function(){loadScript('/plugins/system/twbootstrap/js/jquery/jquery-migrate.min.js','',function(){loadScript('/media/com_hikashop/js/hikashop.js?v=240','',function(){loadScript('//html5shiv.googlecode.com/svn/trunk/html5.js','',function(){loadScript('/templates/14mavelemain01b/script.js','',function(){loadScript('/templates/14mavelemain01b/script.responsive.js','',function(){loadScript('/templates/14mavelemain01b/modules.js','',function(){loadScript('/plugins/system/twbootstrap/js/bootstrap.min.js','',function(){jQuery.noConflict();
The idea could be interesting but it looks like it forget to include the chosen library in his process, so when HikaShop (or another plugin/extension) as for chosen
JHtml::_('formbehavior.chosen', 'select');
the script for the initilization is added by Joomla but the javascript file is not added.
You can see to deactivate the option "Use Chosen library" in your HikaShop configuration but if something else is trying to include chosen, you will have some issues again.
Regards,