We created an iPod-style drilldown menu to help users traverse hierarchical data quickly and with control. It's especially helpful when organizing large data structures that don't translate well into traditional dropdown or fly-out menus.
This drilldown menu provides easy navigation of complex nested structures with any number of levels. The entire menu sits within a fixed-size area, and when a node is selected, breadcrumb links appear above the menu options to both deliver feedback and allow quick access back to nodes higher up in the hierarchy.
A lateral iPod-style slide transition reinforces the notion that you're moving forward into more granular data, or backward into higher-level data. This menu is specifically useful in traversing deeply nested hierarchies, particularly those more than three levels deep. It also provides a more usable alternative to multi-level fly-out menus, which can present challenges to those with limited manual dexterity.
Demo : http://www.filamentgroup.com/examples/menusHierarchical/
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