TYPO3 9: Recursive count subpages of root page - typo3-9.x

Question

is TYPO3 able to collect recursive and show the amount of subpages (no storages) from a specific root page? Tried this typoscript snippet but it is not working somehow.
20 = CONTENT
20 {
table = pages
select {
selectFields = count(*)
pidInList = <ROOT-PID>
andWhere = (hidden=0 AND deleted=0)
}
renderObj = COA
renderObj {
10 = TEXT
10 {
field = count(*)
wrap = Counted pages: |
}
}
}
Maybe there is some function in TYPO3 9?
Thanks in advance!

Answer 1

As the data is stored as a tree you need a recursion to get all pages from all sublevels.
As you can't know the depth (or expect a high number) and typoscript as a configuration language has no recursion build in a pure typoscript solution would be complicated.
Here a userfunc written in PHP and with recursion could be a quick solution.
In general:
Why do you need that number?
Maybe there is a simpler solution
here a pure typoscript solution you might start with:
for each menu-entry you get the sum of all pages up to three levels deeper and the count of pages on the next level.
temp.menudef = TMENU
temp.menudef {
#target = _top
noBlur = 1
#expAll = 1
wrap = <ol>|</ol>
NO = 1
NO {
stdWrap.cObject = COA
stdWrap.cObject {
1 = TEXT
1.field = title
1.required = 1
10 = LOAD_REGISTER
10.level1uids.cObject = COA
10.level1uids.cObject {
10 = CONTENT
10.table = pages
10.select.pidInList.data = field:uid
10.renderObj = TEXT
10.renderObj.field = uid
10.renderObj.wrap = |,
20 = TEXT
#20.field = uid
20.data = field:uid
}
10.level2uids.cObject < .10.level1uids.cObject
10.level2uids.cObject.10.select.pidInList.data = register:level1uids
10.level2uids.cObject.20.data = register:level1uids
10.level3uids.cObject < .10.level1uids.cObject
10.level3uids.cObject.10.select.pidInList.data = register:level2uids
10.level3uids.cObject.20.data = register:level2uids
20 = TEXT
20.wrap = <!-- --> (|
20.required = 1
20.override.numRows.table = pages
20.override.numRows.select.pidInList.data = register:level3uids
20.override.stdWrap.ifEmpty =
20.override.stdWrap.ifEmpty.wrap = |
30 = TEXT
30.wrap = -|)
30.required = 1
30.override.numRows.table = pages
30.override.numRows.select.pidInList.field = uid
30.override.stdWrap.ifEmpty =
30.override.stdWrap.ifEmpty.wrap = |
}
}
NO.wrapItemAndSub = <li>|</li>
NO.accessKey = 1
ACT < .NO
#ACT = 1
ACT.wrapItemAndSub = <li class="activ">|</li>
SPC < .NO
#SPC = 1
SPC.wrapItemAndSub = <li><span class="spacer">|</span></li>
CUR < .ACT
#CUR = 1
CUR.linkWrap = <span class="act">|</span>
CUR.wrapItemAndSub = <li class="current">|</li>
}
temp.submenu = HMENU
temp.submenu {
entryLevel = 0
wrap = <div class="smenu">|</div>
1 < temp.menudef
2 < .1
3 < .2
4 < .3
5 < .4
}