Checking if parent´s ID is 0

161 Posts

Mazso Reply #1, 18 years, 7 months ago

I need a little snippet that checks if the parent of an document is 0. Neither UltimateParent doesn´t seem to fit because it will return the doc´s ID if the parent is 0 nor GetParent (the snippet).

So I wrote this little piece of code for a snippet.

$id = $modx->documentIdentifier;
$topid = $modx->getParent($id,1,'id');
return $topid;

Unfortunately it doesn´t return anything when it is put to a document of the first level and "Array" when it will be called from a seceond level document. What´s wrong with the snippet?

Or is there a way to find out if an document is an grandchild in a site structure like this.

Site root (id 0)
- Home
- foo
- grandchild

Thank you for any suggestion.

MODX Staff
1,535 Posts

Garry Nutting Reply #2, 18 years, 7 months ago

You could use the $modx->getParentIds() method to count the number of levels that the document is nested, kinda like:

$parents = array();
$parents = $modx->getParentIds($modx->documentObject['id']);
if (count($parents) == 0) {
     // we have a top level document (i.e. parent is Site Root)
}

I think that would work in your scenario .... wink

Garry Nutting
Senior Developer
MODX, LLC

Email: [email protected]
Twitter: @garryn
Web: modx.com

161 Posts

Mazso Reply #3, 18 years, 7 months ago

Yes, it works, garryn. Thank you.

While you were writing your post I found the bug in my code. Here is the right version:

$thisID = $modx->documentIdentifier;
$topID = $modx->getParent($thisID,1,'id');
return $topID[id];

This one will returns nothing on a top level document and the ID of the parent of any document on level 2 or deeper.

Nevertheless: Your solution seems to be more straightforward and versatile, so I’ll use this. Maybe you should turn this into a little snippet.