after cacti upgrade to 0.8.8d
zoom not working
Orz
wait for some days
someone find the problem and solved

download jquery-ui.js from https://jqueryui.com/download/
and put it into  /cacti/include/js/

jquery-ui.js is missing from Cacti 0.8.8d tar.gz package.

This library is needed by jquery-zoom plugin.

This is the script load header from default cacti tree view :

<script type="text/javascript" src="/cacti/include/layout.js"></script>
<script type="text/javascript" src="/cacti/include/js/jquery.js" language="javascript"></script>
<script type="text/javascript" src="/cacti/include/js/jquery-ui.js" language="javascript"></script>
<script type="text/javascript" src="/cacti/include/js/jquery.cookie.js" language="javascript"></script>
<script type="text/javascript" src="/cacti/include/js/jstree.js"></script>
<script type="text/javascript" src="/cacti/include/js/jquery.zoom.js" language="javascript"></script>
<script type="text/javascript" src="/cacti/include/jscalendar/calendar.js"></script>
<script type="text/javascript" src="/cacti/include/jscalendar/lang/calendar-en.js"></script>
<script type="text/javascript" src="/cacti/include/jscalendar/calendar-setup.js"></script>

http://forums.cacti.net/viewtopic.php?f=21&t=54754