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Q:

Can data be loaded dynamically? For example, can your menu tree javascript load the
child of a node once the node is clicked on?

A:

You can use AJAX like technology.

http://deluxe-menu.com/ajax-technology-menu-sample.html

You may generate a menu from a database or XML using any server-side script, e.g., PHP, ASP, VB, etc.
However, these scripts don’t work inside of Javascript .js files, so, you should move parameters of a menu from a .js file into an html-page, e.g.:

<!– Deluxe Menu –>
<noscript><a href=”http://deluxe-menu.com”>menu tree javascript by Deluxe-Menu.com</a></noscript>
<script type=”text/javascript”>var dmWorkPath = “menudir/”;</script>
<script type=”text/javascript” src=”menudir/dmenu.js”></script>
<!– (c) 2006, http://deluxe-menu.com –>

<script type=”text/javascript” language=”JavaScript1.2″>
// and describe parameters of a menu
var parameter1=value1;
var parameter2=value2;
etc.

var menuItems = [
// here you generate items using server-side scripts (php, asp, vb, etc.)
];
</script>

The example of the menu working with PHP/MYSQL you can find here:
http://deluxe-menu.com/rq-loading-bar-MySQL-support.html