The fragment below can be used in a sidebar navigation to establish a folder-like subweb navigation. This uses the jqTreeview widget of the TWiki:Plugins/JQueryPlugin.
Use it by adding %INCLUDE{"TWiki.FlexWebListTree"}%
to your WebLeftBar or TWikiWebSideBar.
If you want to hide the web navigation from TWikiGuests then uncomment the following:
%STARTINCLUDE%<!-- flexweblist tree --> %TWISTY{ prefix="<h2 >" link="Webs " suffix="</h2>" showimg="%ICONURLPATH{"plus"}%" hideimg="%ICONURLPATH{"minus"}%" remember="on" }% <div class="jqTreeview closed unique"> %~~ FLEXWEBLIST{ ~~~ webs="%MAINWEB%,User,People,public,%TWIKIWEB%" ~~~ exclude="^(TestCases|Trash).*" ~~~ adminwebs="Applications.*" ~~~ header="<ul>" ~~~ format="<li>$percntWEBLINK{\"$web\"}$percnt" ~~~ separator="</li>" ~~~ footer="</li></ul>" ~~~ subheader="<ul class=\"natSubWebs\">" ~~~ }% </div> %ENDTWISTY% %STOPINCLUDE%