Navigating nearby documents (Siblings)

Task: it is necessary to provide each child page with navigation “previous next”



All the few meager solutions that I found did not suit me: some did not work, some seemed very voluminous to solve such a trivial task. I decided to write my snippet, I hope that it will make life easier not only for me.

<?php

$ID = $modx->documentIdentifier;

$parentId = array_pop($modx->getParentIds($modx->documentIdentifier,1));



$children = $modx->getActiveChildren($parentId, 'menuindex' , 'ASC' );



$i=0;

$key = false ;

while (!$key && $i<count($children)){

$key = array_search($ID,$children[$i]);

$i++;

}



if (!empty($key) && count($children)>1){

$placeholders = array(

'prev' =>($i-2>=0? '<a href="' .$modx->makeUrl($children[$i-2][ 'id' ]). '">« </a>' : '' ),

'next' =>($i<count($children)? '<a href="' .$modx->makeUrl($children[$i][ 'id' ]). '"> »</a>' : '' )

);

$output = $modx->parseChunk( 'prevnext' ,$placeholders, '[+' , '+]' );



}

return $output;

?>



* This source code was highlighted with Source Code Highlighter .

')

Snippet displays the result in the prevnext chunk, which uses two placeholders:

[+ prev +]

[+ next +]



It even works;)